The Experts below are selected from a list of 3618 Experts worldwide ranked by ideXlab platform
Olle Inganäs - One of the best experts on this subject based on the ideXlab platform.
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An Easily Accessible Isoindigo-Based Polymer for High-Performance Polymer Solar Cells
Journal of the American Chemical Society, 2011Co-Authors: Ergang Wang, Olle Inganäs, Fengling Zhang, Zhen Zhang, Koen Vandewal, Patrik Henriksson, Mats AnderssonAbstract:A new, low-band-gap Alternating Copolymer consisting of terthiophene and isoindigo has been designed and synthesized. Solar cells based on this polymer and PC71BM show a power conversion efficiency of 6.3%, which is a record for polymer solar cells based on a polymer with an optical band gap below 1.5 eV. This work demonstrates the great potential of isoindigo moieties as electron-deficient units for building donor–acceptor-type polymers for high-performance polymer solar cells.
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polymer photovoltaics with Alternating Copolymer fullerene blends and novel device architectures
Advanced Materials, 2010Co-Authors: Olle Inganäs, Stefan Hellstrom, Kristofer Tvingstedt, Fengling Zhang, Lars Andersson, Mats AnderssonAbstract:The synthesis of novel conjugated polymers, designed for the purpose of photovoltaic energy conversion, and their properties in polymer/fullerene materials and photovoltaic devices are reviewed. Two families of main chain polymer donors, based on fluorene or phenylene and donor-acceptor-donor comonomers in Alternating Copolymers, are used to absorb the high-energy parts of the solar spectrum and to give high photovoltages in combinations with fullerene acceptors in devices. These materials are used in alternative photovoltaic device geometries with enhanced light incoupling to collect larger photocurrents or to enable tandem devices and enhance photovoltage.
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a planar Copolymer for high efficiency polymer solar cells
Journal of the American Chemical Society, 2009Co-Authors: Ruiping Qin, Olle Inganäs, Clemens Veit, Hansfrieder Schleiermacher, Mattias K Andersson, Zhengping Liu, Uli Wuerfel, Fengling ZhangAbstract:An Alternating Copolymer, poly(2-(5-(5,6-bis(octyloxy)-4-(thiophen-2-yl)benzo[c][1,2,5]thiadiazol-7-yl)thiophen-2-yl)-9-octyl-9H-carbazole) (HXS-1), was designed, synthesized, and used as the donor material for high efficiency polymer solar cells. The close packing of the polymer chains in the solid state was confirmed by XRD. A Jsc of 9.6 mA/cm2, a Voc of 0.81 V, an FF of 0.69, and a PCE of 5.4% were achieved with HXS-1 and [6,6]-phenyl C71-butyric acid methyl ester (PC71BM) as a bulk heterojunction active layer spin-coated from a solvent mixture of 1,2-dichlorobenzene and 1,8-diodooctane (97.5:2.5) under air mass 1.5 global (AM 1.5 G) irradiation of 100 mW/cm2.
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imaging of the 3d nanostructure of a polymer solar cell by electron tomography
Nano Letters, 2009Co-Authors: Viktor B Andersson, Anna Herland, Sergej Masich, Olle InganäsAbstract:Electron tomography has been used for analyzing the active layer in a polymer solar cell, a bulk heterojunction of an Alternating Copolymer of fluorene and a derivative of fullerene. The method supplies a three-dimensional representation of the morphology of the film, where domains with different scattering properties may be distinguished. The reconstruction shows good contrast between the two phases included in the film and demonstrates that electron tomography is an adequate tool for investigations of the three-dimensional nanostructure of the amorphous materials used in polymer solar cells.
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Enhanced photocurrent spectral response in low-bandgap polyfluorene and C70-derivative-based solar cells
Advanced Functional Materials, 2005Co-Authors: Xiangjun Wang, Shimelis Admassie, Mats R. Andersson, Erik Perzon, Frederic Oswald, Fernando Langa, Olle InganäsAbstract:Plastic solar cells have been fabricated using a low-bandgap Alternating Copolymer of fluorene and a donor-acceptor-donor moiety (APFO-Green1), blended with 3'-(3,5-bis-trifluoromethylphenyl)-1'-(4-nitrophenyl)pyrazolino[70]fullerene (BTPF70) as electron acceptor. The polymer shows optical absorption in two wavelength ranges, lambda < 500 nm and 600 < lambda < 1.000 nm. The BTPF70 absorbs light at lambda < 700 urn. A broad photocurrent spectral response in the wavelength range 300 < lambda < 1000 nm is obtained in solar cells. A photocurrent density of 3.4 mA cm(-2), open-circuit voltage of 0.58 V, and power-conversion efficiency of 0.7 % are achieved under illumination of AM1.5 (1000 W m(-2)) from a solar simulator. Synthesis of BTPF70 is presented. Photoluminescence quenching and electrochemical studies are used to discuss photoinduced charge transfer.
Fengling Zhang - One of the best experts on this subject based on the ideXlab platform.
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An Easily Accessible Isoindigo-Based Polymer for High-Performance Polymer Solar Cells
Journal of the American Chemical Society, 2011Co-Authors: Ergang Wang, Olle Inganäs, Fengling Zhang, Zhen Zhang, Koen Vandewal, Patrik Henriksson, Mats AnderssonAbstract:A new, low-band-gap Alternating Copolymer consisting of terthiophene and isoindigo has been designed and synthesized. Solar cells based on this polymer and PC71BM show a power conversion efficiency of 6.3%, which is a record for polymer solar cells based on a polymer with an optical band gap below 1.5 eV. This work demonstrates the great potential of isoindigo moieties as electron-deficient units for building donor–acceptor-type polymers for high-performance polymer solar cells.
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polymer photovoltaics with Alternating Copolymer fullerene blends and novel device architectures
Advanced Materials, 2010Co-Authors: Olle Inganäs, Stefan Hellstrom, Kristofer Tvingstedt, Fengling Zhang, Lars Andersson, Mats AnderssonAbstract:The synthesis of novel conjugated polymers, designed for the purpose of photovoltaic energy conversion, and their properties in polymer/fullerene materials and photovoltaic devices are reviewed. Two families of main chain polymer donors, based on fluorene or phenylene and donor-acceptor-donor comonomers in Alternating Copolymers, are used to absorb the high-energy parts of the solar spectrum and to give high photovoltages in combinations with fullerene acceptors in devices. These materials are used in alternative photovoltaic device geometries with enhanced light incoupling to collect larger photocurrents or to enable tandem devices and enhance photovoltage.
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a planar Copolymer for high efficiency polymer solar cells
Journal of the American Chemical Society, 2009Co-Authors: Ruiping Qin, Olle Inganäs, Clemens Veit, Hansfrieder Schleiermacher, Mattias K Andersson, Zhengping Liu, Uli Wuerfel, Fengling ZhangAbstract:An Alternating Copolymer, poly(2-(5-(5,6-bis(octyloxy)-4-(thiophen-2-yl)benzo[c][1,2,5]thiadiazol-7-yl)thiophen-2-yl)-9-octyl-9H-carbazole) (HXS-1), was designed, synthesized, and used as the donor material for high efficiency polymer solar cells. The close packing of the polymer chains in the solid state was confirmed by XRD. A Jsc of 9.6 mA/cm2, a Voc of 0.81 V, an FF of 0.69, and a PCE of 5.4% were achieved with HXS-1 and [6,6]-phenyl C71-butyric acid methyl ester (PC71BM) as a bulk heterojunction active layer spin-coated from a solvent mixture of 1,2-dichlorobenzene and 1,8-diodooctane (97.5:2.5) under air mass 1.5 global (AM 1.5 G) irradiation of 100 mW/cm2.
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infrared photocurrent spectral response from plastic solar cell with low band gap polyfluorene and fullerene derivative
Applied Physics Letters, 2004Co-Authors: Xiangjun Wang, Erik Perzon, Fernando Langa, Fengling Zhang, Mats Andersson, Juan Luis Delgado, Pilar De La Cruz, Olle InganäsAbstract:Plastic solar cells were fabricated using a low-band-gap Alternating Copolymer of fluorene and a donor–acceptor–donor moiety (APFO-Green1), blended with [6,6]-phenyl-C61-butyric acid methylester or 3′-(3,5-Bis-trifluoromethylphenyl)-1′-(4-nitrophenyl)pyrazolino[60]fullerene as electron acceptors. The polymer shows optical absorption in two wavelength ranges from 300<λ<500nm and 650<λ<1000nm. Devices based on APFO-Green1 blended with the later fullerene exhibit an outstanding photovoltaic behavior at the infrared range, where the external quantum efficiency is as high as 8.4% at 840nm and 7% at 900nm, while the onset of photogeneration is found at 1μm. A photocurrent density of 1.76mA∕cm2, open-circuit voltage of 0.54V, and power conversion efficiency of 0.3% are achieved under the illumination of AM1.5 (1000W∕m2) from a solar simulator.
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High-performance polymer solar cells of an Alternating polyfluorene Copolymer and a fullerene derivative
Advanced Materials, 2003Co-Authors: Mattias Svensson, Jan M. Kroon, Sjoerd C. Veenstra, Wiljan J. H. Verhees, Olle Inganäs, Jan C Hummelen, Fengling Zhang, Mats R. AnderssonAbstract:Solar cells prepared using the Alternating Copolymer shown in the Figure blended with a C-60 derivative (PCBM) are demonstrated to have a high performance, with a power conversion efficiency of 2.2 % under simulated solar light. The molecular weight of the polymer is low due to limited solubility, and films of the polymer exhibit red-shifted absorption.
Mats Andersson - One of the best experts on this subject based on the ideXlab platform.
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An Easily Accessible Isoindigo-Based Polymer for High-Performance Polymer Solar Cells
Journal of the American Chemical Society, 2011Co-Authors: Ergang Wang, Olle Inganäs, Fengling Zhang, Zhen Zhang, Koen Vandewal, Patrik Henriksson, Mats AnderssonAbstract:A new, low-band-gap Alternating Copolymer consisting of terthiophene and isoindigo has been designed and synthesized. Solar cells based on this polymer and PC71BM show a power conversion efficiency of 6.3%, which is a record for polymer solar cells based on a polymer with an optical band gap below 1.5 eV. This work demonstrates the great potential of isoindigo moieties as electron-deficient units for building donor–acceptor-type polymers for high-performance polymer solar cells.
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polymer photovoltaics with Alternating Copolymer fullerene blends and novel device architectures
Advanced Materials, 2010Co-Authors: Olle Inganäs, Stefan Hellstrom, Kristofer Tvingstedt, Fengling Zhang, Lars Andersson, Mats AnderssonAbstract:The synthesis of novel conjugated polymers, designed for the purpose of photovoltaic energy conversion, and their properties in polymer/fullerene materials and photovoltaic devices are reviewed. Two families of main chain polymer donors, based on fluorene or phenylene and donor-acceptor-donor comonomers in Alternating Copolymers, are used to absorb the high-energy parts of the solar spectrum and to give high photovoltages in combinations with fullerene acceptors in devices. These materials are used in alternative photovoltaic device geometries with enhanced light incoupling to collect larger photocurrents or to enable tandem devices and enhance photovoltage.
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infrared photocurrent spectral response from plastic solar cell with low band gap polyfluorene and fullerene derivative
Applied Physics Letters, 2004Co-Authors: Xiangjun Wang, Erik Perzon, Fernando Langa, Fengling Zhang, Mats Andersson, Juan Luis Delgado, Pilar De La Cruz, Olle InganäsAbstract:Plastic solar cells were fabricated using a low-band-gap Alternating Copolymer of fluorene and a donor–acceptor–donor moiety (APFO-Green1), blended with [6,6]-phenyl-C61-butyric acid methylester or 3′-(3,5-Bis-trifluoromethylphenyl)-1′-(4-nitrophenyl)pyrazolino[60]fullerene as electron acceptors. The polymer shows optical absorption in two wavelength ranges from 300<λ<500nm and 650<λ<1000nm. Devices based on APFO-Green1 blended with the later fullerene exhibit an outstanding photovoltaic behavior at the infrared range, where the external quantum efficiency is as high as 8.4% at 840nm and 7% at 900nm, while the onset of photogeneration is found at 1μm. A photocurrent density of 1.76mA∕cm2, open-circuit voltage of 0.54V, and power conversion efficiency of 0.3% are achieved under the illumination of AM1.5 (1000W∕m2) from a solar simulator.
Ye Tao - One of the best experts on this subject based on the ideXlab platform.
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bulk heterojunction solar cells using thieno 3 4 c pyrrole 4 6 dione and dithieno 3 2 b 2 3 d silole Copolymer with a power conversion efficiency of 7 3
Journal of the American Chemical Society, 2011Co-Authors: Taya Chu, Jianfu Ding, Serge Beaupre, Yanguang Zhang, Jeanremi Pouliot, Salem Wakim, Jiayun Zhou, Mario Leclerc, Ye TaoAbstract:A new Alternating Copolymer of dithienosilole and thienopyrrole-4,6-dione (PDTSTPD) possesses both a low optical bandgap (1.73 eV) and a deep highest occupied molecular orbital energy level (5.57 eV). The introduction of branched alkyl chains to the dithienosilole unit was found to be critical for the improvement of the polymer solubility. When blended with PC71BM, PDTSTPD exhibited a power conversion efficiency of 7.3% on the photovoltaic devices with an active area of 1 cm2.
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crystalline low band gap Alternating indolocarbazole and benzothiadiazole cored oligothiophene Copolymer for organic solar cell applications
Chemical Communications, 2008Co-Authors: Fushun Liang, Nicolas Drolet, Jianfu Ding, Ye Tao, Raluca MovileanuAbstract:A low band-gap Alternating Copolymer of indolocarbazole and benzothiadiazole-cored oligothiophene demonstrated balanced crystallinity and solubility; a solar cell combining this polymer with PC61BM in a preliminary test demonstrated power conversion efficiencies of 3.6%.
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Crystalline low band-gap Alternating indolocarbazole and benzothiadiazole-cored oligothiophene Copolymer for organic solar cell applications
2008Co-Authors: Lu Jianping, Ye Tao, Liang Fushun, Drolet Nicolas, Ding Jianfu, Movileanu RalucaAbstract:A low band-gap Alternating Copolymer of indolocarbazole and benzothiadiazole-cored oligothiophene demonstrated balanced crystallinity and solubility; a solar cell combining this polymer with PC61BM in a preliminary test demonstrated power conversion efficiencies of 3.6%.NRC publication: Ye
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toward a rational design of poly 2 7 carbazole derivatives for solar cells
Journal of the American Chemical Society, 2008Co-Authors: Nicolas Blouin, Ye Tao, Salem Wakim, Alexandre Michaud, David Gendron, Emily Blair, Rodica Neaguplesu, Michel Belletete, Gilles Durocher, Mario LeclercAbstract:On the basis of theoretical models and calculations, several Alternating polymeric structures have been investigated to develop optimized poly(2,7-carbazole) derivatives for solar cell applications. Selected low band gap Alternating Copolymers have been obtained via a Suzuki coupling reaction. A good correlation between DFT theoretical calculations performed on model compounds and the experimental HOMO, LUMO, and band gap energies of the corresponding polymers has been obtained. This study reveals that the Alternating Copolymer HOMO energy level is mainly fixed by the carbazole moiety, whereas the LUMO energy level is mainly related to the nature of the electron-withdrawing comonomer. However, solar cell performances are not solely driven by the energy levels of the materials. Clearly, the molecular weight and the overall organization of the polymers are other important key parameters to consider when developing new polymers for solar cells. Preliminary measurements have revealed hole mobilities of about ...
D D C Bradley - One of the best experts on this subject based on the ideXlab platform.
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azobenzene sulphonic dye photoalignment as a means to fabricate liquid crystalline conjugated polymer chain orientation based optical structures
Advanced Optical Materials, 2020Co-Authors: Haoran Zhang, Qian Zhang, Yuping Shi, Yueting Fang, Ruidong Xia, D D C BradleyAbstract:The use of a noncontact photoalignment method to fabricate in‐plane optical structures, defined by the local uniaxial ordering of liquid crystalline conjugated polymer chains, is reported. Molecular orientation is demonstrated for both green‐light‐emitting fluorene‐benzothiadiazole Alternating Copolymer F8BT and F8BT/red light emitting complex Copolymer Red‐F binary blend films deposited on a well‐known azobenzene sulphonic dye photoalignment material SD1. Absorption anisotropy ratios of up to 9.7 are readily achieved for 150 nm thickness F8BT films. Spatial pattern definition, afforded by masking the UV polarized light exposure of the photoalignment layer, allows the fabrication of optical structures with a resolution down to the micron scale. The alignment process is further extended to enable the serial, independent orientation of films deposited on top of each other and to permit the molecular orientation to follow curvilinear patterns. In the former case, this allows F8BT bilayer structures to be fabricated that show even higher absorption anisotropy ratios, up to ≈12, close to the theoretical limit for the previously deduced ≈22° optical transition dipole moment angle relative to the chain axis.