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Xiaowei Zhan - One of the best experts on this subject based on the ideXlab platform.
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enhancing the performance of a fused ring Electron Acceptor by unidirectional extension
Journal of the American Chemical Society, 2019Co-Authors: Boyu Jia, Jing Wang, Mingyu Zhang, Yufeng Jiang, Zheng Tang, Thomas P Russell, Xiaowei ZhanAbstract:The unidirectional extension of a smaller fused-ring system into a larger one in a single direction will increase the conjugation length, allowing a fine-tuning of Electronic properties. Here, we designed and synthesized a unidirectionally extended fused-8-ring-based nonfullerene Acceptor, AOIC, and a bidirectionally extended fused-11-ring Electron Acceptor, IUIC2, and compared these with the parent fused-5-ring Electron Acceptor, F5IC. They share the same Electron-accepting groups and alkylphenyl side chains but have different fused-ring Electron-donating units. Core extension from 5 to 11 rings up-shifts the energy levels, red shifts the absorption spectra, and reduces bandgaps. The unidirectionally extended AOIC has the highest mobility (2.1 × 10-3 cm2 V-1 s-1) relative to the parent F5IC (1.0 × 10-3 cm2 V-1 s-1) and the bidirectionally extended IUIC2 (4.7 × 10-4 cm2 V-1 s-1). Upon blending with the donor PTB7-Th, AOIC-based organic photovoltaic cells show an efficiency of 13.7%, much better than that of F5IC-based cells (5.61%) and IUIC2-based cells (4.48%).
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High Exciton Diffusion Coefficients in Fused Ring Electron Acceptor Films
2019Co-Authors: Sreelakshmi Chandrabose, Kai Chen, Alex J Barker, Joshua J Sutton, Shyamal K K Prasad, Jiadong Zhou, Jingshuai Zhu, Keith C. Gordon, Zengqi Xie, Xiaowei ZhanAbstract:Modest exciton diffusion lengths dictate the need for nanostructured bulk heterojunctions in organic photovoltaic (OPV) cells; however, this morphology compromises charge collection. Here, we reveal rapid exciton diffusion in films of a fused-ring Electron Acceptor that, when blended with a donor, already outperforms fullerene-based OPV cells. Temperature-dependent ultrafast exciton annihilation measurements are used to resolve a quasi-activationless exciton diffusion coefficient of at least 2 × 10–2 cm2/s, substantially exceeding typical organic semiconductors and consistent with the 20–50 nm domain sizes in optimized blends. Enhanced three-dimensional diffusion is shown to arise from molecular and packing factors; the rigid planar molecular structure is associated with low reorganization energy, good transition dipole moment alignment, high chromophore density, and low disorder, all enhancing long-range resonant energy transfer. Relieving exciton diffusion constraints has important implications for OPVs; large, ordered, and pure domains enhance charge separation and transport, and suppress recombination, thereby boosting fill factors. Further enhancements to diffusion lengths may even obviate the need for the bulk heterojunction morphology
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breaking 10 efficiency in semitransparent solar cells with fused undecacyclic Electron Acceptor
Chemistry of Materials, 2018Co-Authors: Boyu Jia, Shuixing Dai, Cenqi Yan, Xiaowei ZhanAbstract:A fused-undecacyclic Electron Acceptor IUIC has been designed, synthesized and applied in organic solar cells (OSCs) and semitransparent organic solar cells (ST-OSCs). In comparison with its counterpart, fused-heptacyclic ITIC4, IUIC with a larger π-conjugation and a stronger Electron-donating core exhibits a higher LUMO level (IUIC: −3. 87 eV vs ITIC4: −3.97 eV), 82 nm red-shifted absorption with larger extinction coefficient and smaller optical bandgap, and higher Electron mobility. Thus, IUIC-based OSCs show higher values in open-circuit voltage, short-circuit current density, and thereby much higher power conversion efficiency (PCE) than those of the ITIC4-based counterpart. The as-cast OSCs based on PTB7-Th: IUIC without any extra treatment yield PCEs of up to 11.2%, higher than that of the control devices based on PTB7-Th: ITIC4 (8.18%). The as-cast ST-OSCs based on PTB7-Th: IUIC without any extra treatment afford PCEs of up to 10.2% with an average visible transmittance (AVT) of 31%, higher than th...
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enhancing the performance of a fused ring Electron Acceptor via extending benzene to naphthalene
Journal of Materials Chemistry C, 2018Co-Authors: Jiayu Wang, Yuze Lin, Jingshuai Zhu, Jeromy James Rech, Kuan Liu, Wei You, Xiaowei ZhanAbstract:We compared an indacenodithiophene(IDT)-based fused-ring Electron Acceptor IDIC1 with its counterpart IHIC1 in which the central benzene unit is replaced by a naphthalene unit, and investigated the effects of the benzene/naphthalene core on the optical and Electronic properties as well as on the performance of organic solar cells (OSCs). Compared with benzene-cored IDIC1, naphthalene-cored IHIC1 shows a larger π-conjugation with stronger intermolecular π–π stacking. Relative to benzene-cored IDIC1, naphthalene-cored IHIC1 shows a higher lowest unoccupied molecular orbital energy level (IHIC1: −3.75 eV, IDIC1: −3.81 eV) and a higher Electron mobility (IHIC1: 3.0 × 10−4 cm2 V−1 s−1, IDIC1: 1.5 × 10−4 cm2 V−1 s−1). When paired with the polymer donor FTAZ that has matched energy levels and a complementary absorption spectrum, IHIC1-based OSCs show higher values of open-circuit voltage, short-circuit current density, fill factor and power conversion efficiency relative to those of the IDIC1-based control devices. These results demonstrate that extending benzene in IDT to naphthalene is a promising approach to upshift energy levels, enhance Electron mobility, and finally achieve higher efficiency in nonfullerene Acceptor-based OSCs.
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high performance Electron Acceptor with thienyl side chains for organic photovoltaics
Journal of the American Chemical Society, 2016Co-Authors: Yuze Lin, Daoben Zhu, Fuwen Zhao, Lijun Huo, Yanming Sun, Chunru Wang, Timothy C Parker, Alan J Heeger, Seth R Marder, Xiaowei ZhanAbstract:We develop an efficient fused-ring Electron Acceptor (ITIC-Th) based on indacenodithieno[3,2-b]thiophene core and thienyl side-chains for organic solar cells (OSCs). Relative to its counterpart with phenyl side-chains (ITIC), ITIC-Th shows lower energy levels (ITIC-Th: HOMO = −5.66 eV, LUMO = −3.93 eV; ITIC: HOMO = −5.48 eV, LUMO = −3.83 eV) due to the σ-inductive effect of thienyl side-chains, which can match with high-performance narrow-band-gap polymer donors and wide-band-gap polymer donors. ITIC-Th has higher Electron mobility (6.1 × 10–4 cm2 V–1 s–1) than ITIC (2.6 × 10–4 cm2 V–1 s–1) due to enhanced intermolecular interaction induced by sulfur–sulfur interaction. We fabricate OSCs by blending ITIC-Th Acceptor with two different low-band-gap and wide-band-gap polymer donors. In one case, a power conversion efficiency of 9.6% was observed, which rivals some of the highest efficiencies for single junction OSCs based on fullerene Acceptors.
Yuze Lin - One of the best experts on this subject based on the ideXlab platform.
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an Electron Acceptor analogue for lowering trap density in organic solar cells
Advanced Materials, 2021Co-Authors: Guilong Cai, Yihang Zhang, Zhenzhen Zhang, Xia Zuo, Yuze LinAbstract:Typical organic semiconductor materials exhibit a high trap density of states, ranging from 1016 to 1018 cm-3 , which is one of the important factors in limiting the improvement of power conversion efficiencies (PCEs) of organic solar cells (OSCs). In order to reduce the trap density within OSCs, a new strategy to design and synthesize an Electron Acceptor analogue, BTPR, is developed, which is introduced into OSCs as a third component to enhance the molecular packing order of Electron Acceptor with and without blending a polymer donor. Finally, the as-cast ternary OSC devices employing BTPR show a notable PCE of 17.8%, with a low trap density (1015 cm-3 ) and a low energy loss (0.217 eV) caused by non-radiative recombination. This PCE is among the highest values for single-junction OSCs. The trap density of OSCs with the BTPR additives, as low as 1015 cm-3 , is comparable to and even lower than those of several typical high-performance inorganic/hybrid counterparts, like 1016 cm-3 for amorphous silicon, 1016 cm-3 for metal oxides, and 1014 to 1015 cm-3 for halide perovskite thin film, and makes it promising for OSCs to obtain a PCE of up to 20%.
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Asymmetric Glycolated Substitution for Enhanced Permittivity and Ecocompatibility of High-Performance Photovoltaic Electron Acceptor
'American Chemical Society (ACS)', 2021Co-Authors: Kang Wang, Guilong Cai, Zhenzhen Zhang, Heng Liu, Yixiao Jia, Ye Yang, Yuze LinAbstract:Traditional organic photovoltaic materials exhibit low dielectric constants (εr) of 3 to 4, restricting the further enhancement of power conversion efficiencies (PCEs) of organic solar cells (OSCs). Herein we design and synthesize a fused-ring Electron Acceptor named Y6-4O through introducing an asymmetric highly polarizable oligo(ethylene glycol) side chain onto the pyrrole unit of Y6. Compared with alkylated Y6 (εr = 3.36), asymmetric glycolated Y6-4O shows a notably higher εr value of 5.13 and better solubility in nonhalogen solvents. Because of the higher εr value, the devices based on as-cast PM6:Y6-4O processed using toluene exhibit a higher charge separation yield, slower bimolecular recombination kinetics, and less voltage loss relative to the control devices based on PM6:Y6. Consequently, a high PCE of 15.2% is achieved for PM6:Y6-4O-based devices, whereas the PM6:Y6-based devices show PCEs of only 7.38%. 15.2% is the highest PCE for the as-cast nonhalogenated processed OSC devices, and it is also much higher than the values (r > 5) organic photovoltaic semiconductors
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enhancing the performance of a fused ring Electron Acceptor via extending benzene to naphthalene
Journal of Materials Chemistry C, 2018Co-Authors: Jiayu Wang, Yuze Lin, Jingshuai Zhu, Jeromy James Rech, Kuan Liu, Wei You, Xiaowei ZhanAbstract:We compared an indacenodithiophene(IDT)-based fused-ring Electron Acceptor IDIC1 with its counterpart IHIC1 in which the central benzene unit is replaced by a naphthalene unit, and investigated the effects of the benzene/naphthalene core on the optical and Electronic properties as well as on the performance of organic solar cells (OSCs). Compared with benzene-cored IDIC1, naphthalene-cored IHIC1 shows a larger π-conjugation with stronger intermolecular π–π stacking. Relative to benzene-cored IDIC1, naphthalene-cored IHIC1 shows a higher lowest unoccupied molecular orbital energy level (IHIC1: −3.75 eV, IDIC1: −3.81 eV) and a higher Electron mobility (IHIC1: 3.0 × 10−4 cm2 V−1 s−1, IDIC1: 1.5 × 10−4 cm2 V−1 s−1). When paired with the polymer donor FTAZ that has matched energy levels and a complementary absorption spectrum, IHIC1-based OSCs show higher values of open-circuit voltage, short-circuit current density, fill factor and power conversion efficiency relative to those of the IDIC1-based control devices. These results demonstrate that extending benzene in IDT to naphthalene is a promising approach to upshift energy levels, enhance Electron mobility, and finally achieve higher efficiency in nonfullerene Acceptor-based OSCs.
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high performance Electron Acceptor with thienyl side chains for organic photovoltaics
Journal of the American Chemical Society, 2016Co-Authors: Yuze Lin, Daoben Zhu, Fuwen Zhao, Lijun Huo, Yanming Sun, Chunru Wang, Timothy C Parker, Alan J Heeger, Seth R Marder, Xiaowei ZhanAbstract:We develop an efficient fused-ring Electron Acceptor (ITIC-Th) based on indacenodithieno[3,2-b]thiophene core and thienyl side-chains for organic solar cells (OSCs). Relative to its counterpart with phenyl side-chains (ITIC), ITIC-Th shows lower energy levels (ITIC-Th: HOMO = −5.66 eV, LUMO = −3.93 eV; ITIC: HOMO = −5.48 eV, LUMO = −3.83 eV) due to the σ-inductive effect of thienyl side-chains, which can match with high-performance narrow-band-gap polymer donors and wide-band-gap polymer donors. ITIC-Th has higher Electron mobility (6.1 × 10–4 cm2 V–1 s–1) than ITIC (2.6 × 10–4 cm2 V–1 s–1) due to enhanced intermolecular interaction induced by sulfur–sulfur interaction. We fabricate OSCs by blending ITIC-Th Acceptor with two different low-band-gap and wide-band-gap polymer donors. In one case, a power conversion efficiency of 9.6% was observed, which rivals some of the highest efficiencies for single junction OSCs based on fullerene Acceptors.
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a facile planar fused ring Electron Acceptor for as cast polymer solar cells with 8 71 efficiency
Journal of the American Chemical Society, 2016Co-Authors: Yuze Lin, Jiayu Wang, Jingshuai Zhu, Fuwen Zhao, Lijun Huo, Jiangquan Mai, Yanming Sun, Chunru Wang, Xiaowei ZhanAbstract:A planar fused-ring Electron Acceptor (IC-C6IDT-IC) based on indacenodithiophene is designed and synthesized. IC-C6IDT-IC shows strong absorption in 500–800 nm with extinction coefficient of up to 2.4 × 105 M–1 cm–1 and high Electron mobility of 1.1 × 10–3 cm2 V–1 s–1. The as-cast polymer solar cells based on IC-C6IDT-IC without additional treatments exhibit power conversion efficiencies of up to 8.71%.
Jiayu Wang - One of the best experts on this subject based on the ideXlab platform.
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enhancing the performance of a fused ring Electron Acceptor via extending benzene to naphthalene
Journal of Materials Chemistry C, 2018Co-Authors: Jiayu Wang, Yuze Lin, Jingshuai Zhu, Jeromy James Rech, Kuan Liu, Wei You, Xiaowei ZhanAbstract:We compared an indacenodithiophene(IDT)-based fused-ring Electron Acceptor IDIC1 with its counterpart IHIC1 in which the central benzene unit is replaced by a naphthalene unit, and investigated the effects of the benzene/naphthalene core on the optical and Electronic properties as well as on the performance of organic solar cells (OSCs). Compared with benzene-cored IDIC1, naphthalene-cored IHIC1 shows a larger π-conjugation with stronger intermolecular π–π stacking. Relative to benzene-cored IDIC1, naphthalene-cored IHIC1 shows a higher lowest unoccupied molecular orbital energy level (IHIC1: −3.75 eV, IDIC1: −3.81 eV) and a higher Electron mobility (IHIC1: 3.0 × 10−4 cm2 V−1 s−1, IDIC1: 1.5 × 10−4 cm2 V−1 s−1). When paired with the polymer donor FTAZ that has matched energy levels and a complementary absorption spectrum, IHIC1-based OSCs show higher values of open-circuit voltage, short-circuit current density, fill factor and power conversion efficiency relative to those of the IDIC1-based control devices. These results demonstrate that extending benzene in IDT to naphthalene is a promising approach to upshift energy levels, enhance Electron mobility, and finally achieve higher efficiency in nonfullerene Acceptor-based OSCs.
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a facile planar fused ring Electron Acceptor for as cast polymer solar cells with 8 71 efficiency
Journal of the American Chemical Society, 2016Co-Authors: Yuze Lin, Jiayu Wang, Jingshuai Zhu, Fuwen Zhao, Lijun Huo, Jiangquan Mai, Yanming Sun, Chunru Wang, Xiaowei ZhanAbstract:A planar fused-ring Electron Acceptor (IC-C6IDT-IC) based on indacenodithiophene is designed and synthesized. IC-C6IDT-IC shows strong absorption in 500–800 nm with extinction coefficient of up to 2.4 × 105 M–1 cm–1 and high Electron mobility of 1.1 × 10–3 cm2 V–1 s–1. The as-cast polymer solar cells based on IC-C6IDT-IC without additional treatments exhibit power conversion efficiencies of up to 8.71%.
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an Electron Acceptor challenging fullerenes for efficient polymer solar cells
Advanced Materials, 2015Co-Authors: Yuze Lin, Zhiguo Zhang, Jiayu Wang, Huitao Bai, Daoben Zhu, Xiaowei ZhanAbstract:A novel non-fullerene Electron Acceptor (ITIC) that overcomes some of the shortcomings of fullerene Acceptors, for example, weak absorption in the visible spectral region and limited energy-level variability, is designed and synthesized. Fullerene-free polymer solar cells (PSCs) based on the ITIC Acceptor are demonstrated to exhibit power conversion effi ciencies of up to 6.8%, a record for fullerene-free PSCs.
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an Electron Acceptor based on indacenodithiophene and 1 1 dicyanomethylene 3 indanone for fullerene free organic solar cells
Journal of Materials Chemistry, 2015Co-Authors: Huitao Bai, Jiayu Wang, Yifan Wang, Pei Cheng, Jianhui Hou, Xiaowei ZhanAbstract:A novel small molecule based on indacenodithiophene and 1,1-dicyanomethylene-3-indanone was synthesized and used as an Electron Acceptor in solution processed organic solar cells, which exhibited a power conversion efficiency as high as 3.93%.
Derek R. Lovley - One of the best experts on this subject based on the ideXlab platform.
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stimulating the anaerobic degradation of aromatic hydrocarbons in contaminated sediments by providing an electrode as the Electron Acceptor
Environmental Microbiology, 2010Co-Authors: Tian Zhang, Sarah M Gannon, Kelly P Nevin, Ashley E Franks, Derek R. LovleyAbstract:The possibility that electrodes might serve as an Electron Acceptor to simulate the degradation of aromatic hydrocarbons in anaerobic contaminated sediments was investigated. Initial studies with Geobacter metallireducens demonstrated that although toluene was rapidly adsorbed onto the graphite electrodes it was rapidly oxidized to carbon dioxide with the electrode serving as the sole Electron Acceptor. Providing graphite electrodes as an Electron Acceptor in hydrocarbon-contaminated sediments significantly stimulated the removal of added toluene and benzene. Rates of toluene and benzene removal accelerated with continued additions of toluene and benzene. [(14)C]-Toluene and [(14)C]-benzene were quantitatively recovered as [(14)C]-CO(2), demonstrating that even though the graphite adsorbed toluene and benzene they were degraded. Introducing an electrode as an Electron Acceptor also accelerated the loss of added naphthalene and [(14)C]-naphthalene was converted to [(14)C]-CO(2). The results suggest that graphite electrodes can serve as an Electron Acceptor for the degradation of aromatic hydrocarbon contaminants in sediments, co-localizing the contaminants, the degradative organisms and the Electron Acceptor. Once in position, they provide a permanent, low-maintenance source of Electron Acceptor. Thus, graphite electrodes may offer an attractive alternative for enhancing contaminant degradation in anoxic environments.
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proteome of geobacter sulfurreducens grown with fe iii oxide or fe iii citrate as the Electron Acceptor
Biochimica et Biophysica Acta, 2008Co-Authors: Yan Huai R Ding, Derek R. Lovley, Kim K Hixson, Muktak Aklujkar, Mary S Lipton, Richard D Smith, Tunde MesterAbstract:The mechanisms for Fe(III) oxide reduction in Geobacter species are of interest because Fe(III) oxides are the most abundant form of Fe(III) in many soils and sediments and Geobacter species are prevalent Fe(III)-reducing microorganisms in many of these environments. Protein abundance in G. sulfurreducens grown on poorly crystalline Fe(III) oxide or on soluble Fe(III) citrate was compared with a global accurate mass and time tag proteomic approach in order to identify proteins that might be specifically associated with Fe(III) oxide reduction. A total of 2991 proteins were detected in G. sulfurreducens grown with acetate as the Electron donor and either Fe(III) oxide or soluble Fe(III) citrate as the Electron Acceptor, resulting in 86% recovery of the genes predicted to encode proteins. Of the total expressed proteins 76% were less abundant in Fe(III) oxide cultures than in Fe(III) citrate cultures, which is consistent with the overall slower rate of metabolism during growth with an insoluble Electron Acceptor. A total of 269 proteins were more abundant in Fe(III) oxide-grown cells than in cells grown on Fe(III) citrate. Most of these proteins were in the energy metabolism category: primarily Electron transport proteins, including 13 c-type cytochromes and PilA, the structural protein for electrically conductive pili. Several of the cytochromes that were more abundant in Fe(III) oxide-grown cells were previously shown with genetic approaches to be essential for optimal Fe(III) oxide reduction. Other proteins that were more abundant during growth on Fe(III) oxide included transport and binding proteins, proteins involved in regulation and signal transduction, cell envelope proteins, and enzymes for amino acid and protein biosynthesis, among others. There were also a substantial number of proteins of unknown function that were more abundant during growth on Fe(III) oxide. These results indicate that Electron transport to Fe(III) oxide requires additional and/or different proteins than Electron transfer to soluble, chelated Fe(III) and suggest proteins whose functions should be further investigated in order to better understand the mechanisms of Electron transfer to Fe(III) oxide in G. sulfurreducens.
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growth of thermophilic and hyperthermophilic fe iii reducing microorganisms on a ferruginous smectite as the sole Electron Acceptor
Applied and Environmental Microbiology, 2008Co-Authors: Kazem Kashefi, Evgenya S Shelobolina, Crawford W Elliott, Derek R. LovleyAbstract:Recent studies have suggested that the structural Fe(III) within phyllosilicate minerals, including smectite and illite, is an important Electron Acceptor for Fe(III)-reducing microorganisms in sedimentary environments at moderate temperatures. The reduction of structural Fe(III) by thermophiles, however, has not previously been described. A wide range of thermophilic and hyperthermophilic Archaea and Bacteria from marine and freshwater environments that are known to reduce poorly crystalline Fe(III) oxides were tested for their ability to reduce structural (octahedrally coordinated) Fe(III) in smectite (SWa-1) as the sole Electron Acceptor. Two out of the 10 organisms tested, Geoglobus ahangari and Geothermobacterium ferrireducens, were not able to conserve energy to support growth by reduction of Fe(III) in SWa-1 despite the fact that both organisms were originally isolated with solid-phase Fe(III) as the Electron Acceptor. The other organisms tested were able to grow on SWa-1 and reduced 6.3 to 15.1% of the Fe(III). This is 20 to 50% less than the reported amounts of Fe(III) reduced in the same smectite (SWa-1) by mesophilic Fe(III) reducers. Two organisms, Geothermobacter ehrlichii and archaeal strain 140, produced copious amounts of an exopolysaccharide material, which may have played an active role in the dissolution of the structural iron in SWa-1 smectite. The reduction of structural Fe(III) in SWa-1 by archaeal strain 140 was studied in detail. Microbial Fe(III) reduction was accompanied by an increase in interlayer and octahedral charges and some incorporation of potassium and magnesium into the smectite structure. However, these changes in the major element chemistry of SWa-1 smectite did not result in the formation of an illite-like structure, as reported for a mesophilic Fe(III) reducer. These results suggest that thermophilic Fe(III)-reducing organisms differ in their ability to reduce and solubilize structural Fe(III) in SWa-1 smectite and that SWa-1 is not easily transformed to illite by these organisms.
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geobacter sulfurreducens can grow with oxygen as a terminal Electron Acceptor
Applied and Environmental Microbiology, 2004Co-Authors: W C Lin, Maddalena V Coppi, Derek R. LovleyAbstract:Geobacter sulfurreducens, previously classified as a strict anaerobe, tolerated exposure to atmospheric oxygen for at least 24 h and grew with oxygen as the sole Electron Acceptor at concentrations of 10% or less in the headspace. These results help explain how Geobacter species may survive in oxic subsurface environments, being poised to rapidly take advantage of the development of anoxic conditions.
Zhiguo Zhang - One of the best experts on this subject based on the ideXlab platform.
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a near infrared non fullerene Electron Acceptor for high performance polymer solar cells
Energy and Environmental Science, 2017Co-Authors: Lian Zhong, Zhiguo Zhang, Bhoj Gautam, Haijun Bin, Jiudong Lin, Zhanjun Zhang, Zuoquan Jiang, Kenan Gundogdu, Liangsheng LiaoAbstract:Low-bandgap polymers/molecules are an interesting family of semiconductor materials, and have enabled many recent exciting breakthroughs in the field of organic Electronics, especially for organic photovoltaics (OPVs). Here, such a low-bandgap (1.43 eV) non-fullerene Electron Acceptor (BT-IC) bearing a fused 7-heterocyclic ring with absorption edge extending to the near-infrared (NIR) region was specially designed and synthesized. Benefitted from its NIR light harvesting, high performance OPVs were fabricated with medium bandgap polymers (J61 and J71) as donors, showing power conversion efficiencies of 9.6% with J61 and 10.5% with J71 along with extremely low energy loss (0.56 eV for J61 and 0.53 eV for J71). Interestingly, femtosecond transient absorption spectroscopy studies on both systems show that efficient charge generation was observed despite the fact that the highest occupied molecular orbital (HOMO)–HOMO offset (ΔEH) in the blends was as low as 0.10 eV, suggesting that such a small ΔEH is not a crucial limitation in realizing high performance of NIR non-fullerene based OPVs. Our results indicated that BT-IC is an interesting NIR non-fullerene Acceptor with great potential application in tandem/multi-junction, semitransparent, and ternary blend solar cells.
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a fused ring based Electron Acceptor for efficient non fullerene polymer solar cells with small homo offset
Nano Energy, 2016Co-Authors: Deping Qian, Zhiguo Zhang, Lian Zhong, Jiudong Lin, Zhanjun Zhang, Zuoquan Jiang, Liangsheng Liao, Fengling ZhangAbstract:A non-fullerene Electron Acceptor bearing a novel backbone with fused 10-heterocyclic ring (in-dacenodithiopheno-indacenodiselenophene), denoted by IDTIDSe-IC is developed for fullerene free polyme ...
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an Electron Acceptor challenging fullerenes for efficient polymer solar cells
Advanced Materials, 2015Co-Authors: Yuze Lin, Zhiguo Zhang, Jiayu Wang, Huitao Bai, Daoben Zhu, Xiaowei ZhanAbstract:A novel non-fullerene Electron Acceptor (ITIC) that overcomes some of the shortcomings of fullerene Acceptors, for example, weak absorption in the visible spectral region and limited energy-level variability, is designed and synthesized. Fullerene-free polymer solar cells (PSCs) based on the ITIC Acceptor are demonstrated to exhibit power conversion effi ciencies of up to 6.8%, a record for fullerene-free PSCs.
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thiophene fused benzothiadiazole a strong Electron Acceptor unit to build d a copolymer for highly efficient polymer solar cells
Chemistry of Materials, 2014Co-Authors: Pengcheng Zhou, Zhiguo Zhang, Xingguo Chen, Jingui QinAbstract:A novel strong Electron-Acceptor, thieno[2,3-f]-2,1,3-benzothiadiazole-6-carboxylate (BTT), was first designed and synthesized. By introducing two thienyl groups into BTT and then copolymerizing with thienyl group substituted benzo[1,2-b:4,5-b′]dithiophene (BDTT) unit, a low band gap D–A copolymer (PBTT-TBDTT) was obtained. Compared with its polymer analogue (PBT-TBDTT) with benzothiadiazole (BT) as an Acceptor, PBTT-TBDTT exhibits stronger intramolecular charge transfer. Thus, it shows much broader absorption covering almost the whole visible light region (in the range of 300–850 nm) and narrower optical band gap around 1.45 eV with a large IP (ionization potential) at 5.35 eV. The maximum efficiency of PBTT-TBDTT based device reaches 6.07% which is much higher than that of PBT-TBDTT (3.24%), indicating that BTT unit is a promising Electron-Acceptor moiety to construct low band gap D–A copolymers for PSCs with high photovoltaic performances.