The Experts below are selected from a list of 19827 Experts worldwide ranked by ideXlab platform
David J. Jones - One of the best experts on this subject based on the ideXlab platform.
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solution processable solid state donor Acceptor Materials for singlet fission
Advanced Energy Materials, 2018Co-Authors: Saghar Masoomigodarzi, Maning Liu, Yasuhiro Tachibana, Lars Goerigk, Kenneth P. Ghiggino, Trevor A. Smith, David J. JonesAbstract:The exploitation of singlet fission (SF) Materials in optoelectronic devices is restricted by the limited number of SF Materials available and developing new organic Materials that undergo singlet fission is a significant challenge. Using a new strategy based on conjugating strong donor and Acceptor building blocks, the small molecule (BDT(DPP)2) and polymer (p-BDT-DPP) systems are designed and synthesized knowing that bisthiophene-2,5-dihydropyrrolo[3,4-c]pyrrole-1,4-dione (DPP) has a low lying triplet energy level, which is further confirmed by time-dependent density functional theory (TD-DFT) calculations. TD-DFT and natural transition orbital (NTO) analysis are conducted to gain insight into the photophysical properties and features of excited states in BDT(DPP)2, respectively. Femtosecond and nanosecond transient absorption spectroscopies are used to investigate the excited state kinetics in the synthesized compounds. Fast formation of triplet pairs in thin film of p-BDT-DPP and BDT(DPP)2 and the equilibrium formation of correlated triplet pairs and S1 from triplet�triplet annihilation in solution of BDT(DPP)2 are further evidence of SF in these compounds. The short triplet lifetime, as a result of fast biexcitonic recombination, provides additional support for triplet pair formation through singlet fission.
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Solution‐Processable, Solid State Donor–Acceptor Materials for Singlet Fission
Advanced Energy Materials, 2018Co-Authors: Saghar Masoomi-godarzi, Maning Liu, Yasuhiro Tachibana, Lars Goerigk, Kenneth P. Ghiggino, Trevor A. Smith, David J. JonesAbstract:The exploitation of singlet fission (SF) Materials in optoelectronic devices is restricted by the limited number of SF Materials available and developing new organic Materials that undergo singlet fission is a significant challenge. Using a new strategy based on conjugating strong donor and Acceptor building blocks, the small molecule (BDT(DPP)2) and polymer (p-BDT-DPP) systems are designed and synthesized knowing that bisthiophene-2,5-dihydropyrrolo[3,4-c]pyrrole-1,4-dione (DPP) has a low lying triplet energy level, which is further confirmed by time-dependent density functional theory (TD-DFT) calculations. TD-DFT and natural transition orbital (NTO) analysis are conducted to gain insight into the photophysical properties and features of excited states in BDT(DPP)2, respectively. Femtosecond and nanosecond transient absorption spectroscopies are used to investigate the excited state kinetics in the synthesized compounds. Fast formation of triplet pairs in thin film of p-BDT-DPP and BDT(DPP)2 and the equilibrium formation of correlated triplet pairs and S1 from triplet�triplet annihilation in solution of BDT(DPP)2 are further evidence of SF in these compounds. The short triplet lifetime, as a result of fast biexcitonic recombination, provides additional support for triplet pair formation through singlet fission.
Tomás Torres - One of the best experts on this subject based on the ideXlab platform.
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Perfluorinated Subphthalocyanine as a New Acceptor Material in a Small‐Molecule Bilayer Organic Solar Cell
Advanced Functional Materials, 2009Co-Authors: Hans Gommans, Tom Aernouts, Bregt Verreet, Paul Heremans, Christian G Claessens, Anaïs Medina, Tomás TorresAbstract:The complex refractive index of fluorinated subphthalocyanines (SubPcs) deposited by vacuum sublimation is determined by spectral ellipsometry. Their performance as Acceptor material is characterized in a range of donor/Acceptor heterojunctions in organic photovoltaic cells (OPVCs) by current–voltage measurements under 1 sun AM 1.5D simulated solar illumination and spectral response. Both electron and hole transfer between donor and Acceptor Materials is demonstrated. Power conversion efficiencies of 0.96% are found with an open-circuit bias of 940 mV. Hence, it is shown that fluorinated SubPcs can be considered as an Acceptor material in OPVCs with an absorption in the visible comparable to that of well-known metallophthalocyanines.
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perfluorinated subphthalocyanine as a new Acceptor material in a small molecule bilayer organic solar cell
Advanced Functional Materials, 2009Co-Authors: Hans Gommans, Tom Aernouts, Bregt Verreet, Paul Heremans, Anaa S Medina, Christian G Claessens, Tomás TorresAbstract:The complex refractive index of fluorinated subphthalocyanines (SubPcs) deposited by vacuum sublimation is determined by spectral ellipsometry. Their performance as Acceptor material is characterized in a range of donor/Acceptor heterojunctions in organic photovoltaic cells (OPVCs) by current–voltage measurements under 1 sun AM 1.5D simulated solar illumination and spectral response. Both electron and hole transfer between donor and Acceptor Materials is demonstrated. Power conversion efficiencies of 0.96% are found with an open-circuit bias of 940 mV. Hence, it is shown that fluorinated SubPcs can be considered as an Acceptor material in OPVCs with an absorption in the visible comparable to that of well-known metallophthalocyanines.
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New donor-Acceptor Materials based on random polynorbornenes bearing pendant phthalocyanine and fullerene units.
Chemistry an Asian journal, 2006Co-Authors: Andrés De La Escosura, Dirk M. Guldi, M. Victoria Martínez-díaz, Tomás Torres, Robert H. Grubbs, Helmut Neugebauer, Christoph Winder, Martin Drees, N. Serdar SariciftciAbstract:New donor-Acceptor materi- als based on a polynorbornene frame- work to which both phthalocyanine and C60 electroactive pendant units are randomly attached have been prepared in good yield by ring-opening-metathe- sis polymerization (ROMP) in the presence of a Grubbs catalyst. A struc- turally related phthalocyanine homopo- lymer was also synthesized for compar- ison. A remarkable fluorescence quenching was observed in the homo- polymer and accounts for Pc···Pc inter- actions along the polymeric framework. As expected, the fluorescence quench- ing increases in the case of the polynor- bornenes containing both Pc and C60 units owing to photoinduced electron transfer, which was further confirmed by transient absorption spectroscopy. Finally, preliminary solar cell devices made of one of the copolymers were constructed.
Gang Chen - One of the best experts on this subject based on the ideXlab platform.
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synthesis and characterization of triphenylamine benzothiazole based donor and Acceptor Materials
Synthetic Metals, 2010Co-Authors: Hai-ying Wang, Gang ChenAbstract:Abstract A series of π-conjugated compounds were successfully synthesized by varying ratios of triphenylamine as donor (D) and benzothiazole as Acceptor (A). The structure–property relationship about photoluminescence based on these synthesized compounds was systematically discussed in detail. Quantum chemical calculations were used to obtain optimized ground-state geometry by hybrid density functional theory (B3LYP) with 6-31G* basis set, spatial distributions of the highest occupied molecular orbital (HOMO), the lowest unoccupied molecular orbital (LUMO) levels of the compounds. As expected, these compounds exhibit high extinction coefficients, high quantum yields, and excellent thermal stability properties. The optical properties clearly indicate that the fluorescent emission properties of these compounds rely largely on the molecular structure.
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Synthesis and characterization of triphenylamine–benzothiazole-based donor and Acceptor Materials
Synthetic Metals, 2010Co-Authors: Hai-ying Wang, Gang ChenAbstract:Abstract A series of π-conjugated compounds were successfully synthesized by varying ratios of triphenylamine as donor (D) and benzothiazole as Acceptor (A). The structure–property relationship about photoluminescence based on these synthesized compounds was systematically discussed in detail. Quantum chemical calculations were used to obtain optimized ground-state geometry by hybrid density functional theory (B3LYP) with 6-31G* basis set, spatial distributions of the highest occupied molecular orbital (HOMO), the lowest unoccupied molecular orbital (LUMO) levels of the compounds. As expected, these compounds exhibit high extinction coefficients, high quantum yields, and excellent thermal stability properties. The optical properties clearly indicate that the fluorescent emission properties of these compounds rely largely on the molecular structure.
Yasuhiro Tachibana - One of the best experts on this subject based on the ideXlab platform.
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solution processable solid state donor Acceptor Materials for singlet fission
Advanced Energy Materials, 2018Co-Authors: Saghar Masoomigodarzi, Maning Liu, Yasuhiro Tachibana, Lars Goerigk, Kenneth P. Ghiggino, Trevor A. Smith, David J. JonesAbstract:The exploitation of singlet fission (SF) Materials in optoelectronic devices is restricted by the limited number of SF Materials available and developing new organic Materials that undergo singlet fission is a significant challenge. Using a new strategy based on conjugating strong donor and Acceptor building blocks, the small molecule (BDT(DPP)2) and polymer (p-BDT-DPP) systems are designed and synthesized knowing that bisthiophene-2,5-dihydropyrrolo[3,4-c]pyrrole-1,4-dione (DPP) has a low lying triplet energy level, which is further confirmed by time-dependent density functional theory (TD-DFT) calculations. TD-DFT and natural transition orbital (NTO) analysis are conducted to gain insight into the photophysical properties and features of excited states in BDT(DPP)2, respectively. Femtosecond and nanosecond transient absorption spectroscopies are used to investigate the excited state kinetics in the synthesized compounds. Fast formation of triplet pairs in thin film of p-BDT-DPP and BDT(DPP)2 and the equilibrium formation of correlated triplet pairs and S1 from triplet�triplet annihilation in solution of BDT(DPP)2 are further evidence of SF in these compounds. The short triplet lifetime, as a result of fast biexcitonic recombination, provides additional support for triplet pair formation through singlet fission.
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Solution‐Processable, Solid State Donor–Acceptor Materials for Singlet Fission
Advanced Energy Materials, 2018Co-Authors: Saghar Masoomi-godarzi, Maning Liu, Yasuhiro Tachibana, Lars Goerigk, Kenneth P. Ghiggino, Trevor A. Smith, David J. JonesAbstract:The exploitation of singlet fission (SF) Materials in optoelectronic devices is restricted by the limited number of SF Materials available and developing new organic Materials that undergo singlet fission is a significant challenge. Using a new strategy based on conjugating strong donor and Acceptor building blocks, the small molecule (BDT(DPP)2) and polymer (p-BDT-DPP) systems are designed and synthesized knowing that bisthiophene-2,5-dihydropyrrolo[3,4-c]pyrrole-1,4-dione (DPP) has a low lying triplet energy level, which is further confirmed by time-dependent density functional theory (TD-DFT) calculations. TD-DFT and natural transition orbital (NTO) analysis are conducted to gain insight into the photophysical properties and features of excited states in BDT(DPP)2, respectively. Femtosecond and nanosecond transient absorption spectroscopies are used to investigate the excited state kinetics in the synthesized compounds. Fast formation of triplet pairs in thin film of p-BDT-DPP and BDT(DPP)2 and the equilibrium formation of correlated triplet pairs and S1 from triplet�triplet annihilation in solution of BDT(DPP)2 are further evidence of SF in these compounds. The short triplet lifetime, as a result of fast biexcitonic recombination, provides additional support for triplet pair formation through singlet fission.
Lars Goerigk - One of the best experts on this subject based on the ideXlab platform.
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solution processable solid state donor Acceptor Materials for singlet fission
Advanced Energy Materials, 2018Co-Authors: Saghar Masoomigodarzi, Maning Liu, Yasuhiro Tachibana, Lars Goerigk, Kenneth P. Ghiggino, Trevor A. Smith, David J. JonesAbstract:The exploitation of singlet fission (SF) Materials in optoelectronic devices is restricted by the limited number of SF Materials available and developing new organic Materials that undergo singlet fission is a significant challenge. Using a new strategy based on conjugating strong donor and Acceptor building blocks, the small molecule (BDT(DPP)2) and polymer (p-BDT-DPP) systems are designed and synthesized knowing that bisthiophene-2,5-dihydropyrrolo[3,4-c]pyrrole-1,4-dione (DPP) has a low lying triplet energy level, which is further confirmed by time-dependent density functional theory (TD-DFT) calculations. TD-DFT and natural transition orbital (NTO) analysis are conducted to gain insight into the photophysical properties and features of excited states in BDT(DPP)2, respectively. Femtosecond and nanosecond transient absorption spectroscopies are used to investigate the excited state kinetics in the synthesized compounds. Fast formation of triplet pairs in thin film of p-BDT-DPP and BDT(DPP)2 and the equilibrium formation of correlated triplet pairs and S1 from triplet�triplet annihilation in solution of BDT(DPP)2 are further evidence of SF in these compounds. The short triplet lifetime, as a result of fast biexcitonic recombination, provides additional support for triplet pair formation through singlet fission.
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Solution‐Processable, Solid State Donor–Acceptor Materials for Singlet Fission
Advanced Energy Materials, 2018Co-Authors: Saghar Masoomi-godarzi, Maning Liu, Yasuhiro Tachibana, Lars Goerigk, Kenneth P. Ghiggino, Trevor A. Smith, David J. JonesAbstract:The exploitation of singlet fission (SF) Materials in optoelectronic devices is restricted by the limited number of SF Materials available and developing new organic Materials that undergo singlet fission is a significant challenge. Using a new strategy based on conjugating strong donor and Acceptor building blocks, the small molecule (BDT(DPP)2) and polymer (p-BDT-DPP) systems are designed and synthesized knowing that bisthiophene-2,5-dihydropyrrolo[3,4-c]pyrrole-1,4-dione (DPP) has a low lying triplet energy level, which is further confirmed by time-dependent density functional theory (TD-DFT) calculations. TD-DFT and natural transition orbital (NTO) analysis are conducted to gain insight into the photophysical properties and features of excited states in BDT(DPP)2, respectively. Femtosecond and nanosecond transient absorption spectroscopies are used to investigate the excited state kinetics in the synthesized compounds. Fast formation of triplet pairs in thin film of p-BDT-DPP and BDT(DPP)2 and the equilibrium formation of correlated triplet pairs and S1 from triplet�triplet annihilation in solution of BDT(DPP)2 are further evidence of SF in these compounds. The short triplet lifetime, as a result of fast biexcitonic recombination, provides additional support for triplet pair formation through singlet fission.
