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Samson A Jenekhe - One of the best experts on this subject based on the ideXlab platform.
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Annealing temperature dependence of the efficiency and vertical phase segregation of Polymer/Polymer Bulk heterojunction photovoltaic cells
Applied Physics Letters, 2014Co-Authors: Nishit M. Murari, Ye-jin Hwang, Matthew J. Crane, Tae Shik Earmme, Samson A JenekheAbstract:We report observation of annealing temperature-induced simultaneous vertical phase segregation and large enhancement of power conversion efficiency (PCE) of all-Polymer Bulk heterojunction (BHJ) solar cells composed of a poly(3-hexylthiophene) (P3HT) donor and a naphthalene diimide-selenolo[3,2-b]selenophene coPolymer (PNDISS) acceptor. The PCE of P3HT:PNDISS BHJ devices increased over 50-fold from 0.04% to 2.03% when the annealing temperature was increased from 50 to 150 °C. Absorption spectroscopy and photoluminescence quenching experiments provide evidence of increasing phase segregation of the Polymer/Polymer blend films with increasing annealing temperature. Field-effect charge transport, contact angle, surface energy, and variable angle ellipsometry measurements on the P3HT:PNDISS blend films showed that thermal annealing induced vertical phase segregation, whereby the low surface energy Polymer (P3HT) migrated to the Bulk, while the high surface energy Polymer (PNDISS) enriches at the substrate/ble...
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Annealing temperature dependence of the efficiency and vertical phase segregation of Polymer/Polymer Bulk heterojunction photovoltaic cells
Applied Physics Letters J. Vac. Sci. Technol. B, 2014Co-Authors: Nishit M. Murari, Ye-jin Hwang, Matthew J. Crane, Tae Shik Earmme, Samson A JenekheAbstract:Articles you may be interested in Improved efficiency of flexible Polymer solar cells with a non-annealing active layer J. Renewable Sustainable Energy 6, 023128 (2014); 10.1063/1.4873998 Raman and low temperature photoluminescence spectroscopy of Polymer disorder in Bulk heterojunction solar cell films Appl. Phys. Lett. 101, 083302 (2012); 10.1063/1.4747320 A low band gap, solution processable oligothiophene with a dialkylated diketopyrrolopyrrole chromophore for use in Bulk heterojunction solar cells Appl. Phys. Lett. 94, 103301 (2009); 10.1063/1.3086897 The use of thermal initiator to make organic Bulk heterojunction solar cells with a good percolation path Appl. Phys. Lett. 93, 043304 (2008); 10.1063/1.2965468 Imaging layers for the directed assembly of block coPolymer films: Dependence of the physical and chemical properties of patterned Polymer brushes on brush molecular weight We report observation of annealing temperature-induced simultaneous vertical phase segregation and large enhancement of power conversion efficiency (PCE) of all-Polymer Bulk heterojunction (BHJ) solar cells composed of a poly(3-hexylthiophene) (P3HT) donor and a naphthalene diimide-selenolo[3,2-b]selenophene coPolymer (PNDISS) acceptor. The PCE of P3HT:PNDISS BHJ devices increased over 50-fold from 0.04% to 2.03% when the annealing temperature was increased from 50 to 150 C. Absorption spectroscopy and photoluminescence quenching experiments provide evidence of increasing phase segregation of the Polymer/Polymer blend films with increasing annealing temperature. Field-effect charge transport, contact angle, surface energy, and variable angle ellipsometry measurements on the P3HT:PNDISS blend films showed that thermal annealing induced vertical phase segregation, whereby the low surface energy Polymer (P3HT) migrated to the Bulk, while the high surface energy Polymer (PNDISS) enriches at the substrate/blend interface. V C 2014 AIP Publishing LLC. [http://dx.doi.org/10.1063/1.4880941] Organic solar cells have been extensively investigated for energy harvesting due to their low-cost, facile, and sus-tainable processing attributes. Bulk-heterojunction (BHJ) organic solar cells have provided the highest efficiencies to date by enhancing the donor/acceptor interface area to drive efficient exciton dissociation. 1–5 Control of compositional and morphological structure through lateral and vertical phase segregation has enabled high efficiencies (>9%) in Polymer/fullerene devices and proven phase segregation to be a critical parameter for high efficiencies. 6–9 BHJ all-Polymer solar cells consisting of blends of a donor Polymer and an acceptor Polymer have recently emerged with promis-ing efficiencies of 3%–4%. 10–12 However, phase segregation in Polymer/Polymer blend BHJ devices has not yet been fully investigated, despite the versatile, low-cost framework, it provides for highly efficient solar cells. 12,13
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n type naphthalene diimide biselenophene coPolymer for all Polymer Bulk heterojunction solar cells
Macromolecules, 2012Co-Authors: Ye-jin Hwang, Nishit M. Murari, Samson A JenekheAbstract:A new solution processable n-type Polymer semiconductor is synthesized and characterized for use as an electron acceptor material in all-Polymer Bulk heterojunction solar cells. The new crystalline coPolymer, poly(naphthalene diimide-alt-biselenophene) (PNDIBS), has a high field-effect electron mobility (0.07 cm2/(V s)) and broad visible-near-infrared absorption band with an optical band gap of 1.4 eV. All-Polymer Bulk heterojunction solar cells comprised of PNDIBS acceptor and poly(3-hexylthiophene) donor have a photovoltaic power conversion efficiency of 0.9%. The external quantum efficiency spectrum of the all-Polymer solar cells shows that about 19% of the photocurrent comes from the near-infrared (700–900 nm) light harvesting by the new n-type Polymer semiconductor.
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n-Type Naphthalene Diimide–Biselenophene CoPolymer for All-Polymer Bulk Heterojunction Solar Cells
Macromolecules, 2012Co-Authors: Ye-jin Hwang, Nishit M. Murari, Samson A JenekheAbstract:A new solution processable n-type Polymer semiconductor is synthesized and characterized for use as an electron acceptor material in all-Polymer Bulk heterojunction solar cells. The new crystalline coPolymer, poly(naphthalene diimide-alt-biselenophene) (PNDIBS), has a high field-effect electron mobility (0.07 cm2/(V s)) and broad visible-near-infrared absorption band with an optical band gap of 1.4 eV. All-Polymer Bulk heterojunction solar cells comprised of PNDIBS acceptor and poly(3-hexylthiophene) donor have a photovoltaic power conversion efficiency of 0.9%. The external quantum efficiency spectrum of the all-Polymer solar cells shows that about 19% of the photocurrent comes from the near-infrared (700–900 nm) light harvesting by the new n-type Polymer semiconductor.
Jean Manca - One of the best experts on this subject based on the ideXlab platform.
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influence of thermal ageing on the stability of Polymer Bulk heterojunction solar cells
Solar Energy Materials and Solar Cells, 2007Co-Authors: Sabine Bertho, T Martens, Laurence Lutsen, Dirk Vanderzande, Jean Manca, I Haeldermans, A Swinnen, Wouter MoonsAbstract:Abstract A new approach is presented in order to improve the thermal stability of Polymer: [6-6]-phenyl C61 butyric acid methyl ester (PCBM) Bulk heterojunction solar cells. The central idea in this approach is the use of a Polymer with high glass transition temperature (Tg), well above the normal operating temperatures of the devices. In this paper, a PPV-derivative with a Tg of 150 °C was used as an electron donor and the thermal stability of the obtained solar cells was compared with solar cells based on the reference material poly[2-methoxy-5-(3′,7′-dimethyloctyloxy)-1,4-phenylene vinylene] (MDMO-PPV) with a Tg of 45 °C. The use of the material with higher glass transition temperature resulted in a significant improvement of the thermal stability of the photovoltaic parameters. Furthermore, a systematic transmission electron microscope (TEM) study demonstrates that the better thermal stability of performance coincides with a more stable active layer morphology. Both improvements are attributed to the reduced free movement of the electron donor material (PCBM) within the active layer of the solar cell.
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Modelling the short-circuit current of Polymer Bulk heterojunction solar cells
Thin Solid Films, 2004Co-Authors: Wim Geens, T Martens, S Borghs, Tom Aernouts, Laurence Lutsen, Robert Mertens, Paul Heremans, Jef Poortmans, Jean Manca, Dirk VanderzandeAbstract:An analytical model has been developed to estimate the short-circuit current density of conjugated Polymer/fullerene Bulk heterojunction solar cells. The model takes into account the solvent-dependent molecular morphology of the donor/acceptor blend, which was revealed by transmission electron microscopy. Field-effect transistors based on single and composite organic layers were fabricated to determine values for the charge carrier mobilities of such films. These values served as input parameters of the model. It is shown that the difference in short-circuit current density that was measured between toluene-cast and chlorobenzene-cast conjugated Polymer/fullerene photovoltaic cells (Appl. Phys. Lett. 78 (2001) 841) could be very well simulated with the model. Moreover, the calculations illustrate how increasing the hole and electron mobilities in the photoactive blend can improve the overall short-circuit current density of the solar cell.
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Modelling the short-circuit current of Polymer Bulk heterojunction solar cells
Thin Solid Films, 2004Co-Authors: Wim Geens, T Martens, S Borghs, Rita Mertens, Tom Aernouts, Laurence Lutsen, Paul Heremans, Jef Poortmans, Jean Manca, Dirk VanderzandeAbstract:An analytical model has been developed to estimate the short-circuit current density of conjugated Polymer/fullerene Bulk heterojunction solar cells. The model takes into account the solvent-dependent molecular morphology of the donor/acceptor blend, which was revealed by transmission electron microscopy. Field-effect transistors based on single and composite organic layers were fabricated to determine values for the charge carrier mobilities of such films. These values served as input parameters of the model. It is shown that the difference in short-circuit current density that was measured between toluene-cast and chlorobenzene-cast conjugated Polymer/fullerene photovoltaic cells (Appl. Phys. Lett. 78 (2001) 841) could be very well simulated with the model. Moreover, the calculations illustrate how increasing the hole and electron mobilities in the photoactive blend can improve the overall short-circuit current density of the solar cell. (C) 2003 Elsevier B.V. All rights reserved.
Ye-jin Hwang - One of the best experts on this subject based on the ideXlab platform.
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Annealing temperature dependence of the efficiency and vertical phase segregation of Polymer/Polymer Bulk heterojunction photovoltaic cells
Applied Physics Letters, 2014Co-Authors: Nishit M. Murari, Ye-jin Hwang, Matthew J. Crane, Tae Shik Earmme, Samson A JenekheAbstract:We report observation of annealing temperature-induced simultaneous vertical phase segregation and large enhancement of power conversion efficiency (PCE) of all-Polymer Bulk heterojunction (BHJ) solar cells composed of a poly(3-hexylthiophene) (P3HT) donor and a naphthalene diimide-selenolo[3,2-b]selenophene coPolymer (PNDISS) acceptor. The PCE of P3HT:PNDISS BHJ devices increased over 50-fold from 0.04% to 2.03% when the annealing temperature was increased from 50 to 150 °C. Absorption spectroscopy and photoluminescence quenching experiments provide evidence of increasing phase segregation of the Polymer/Polymer blend films with increasing annealing temperature. Field-effect charge transport, contact angle, surface energy, and variable angle ellipsometry measurements on the P3HT:PNDISS blend films showed that thermal annealing induced vertical phase segregation, whereby the low surface energy Polymer (P3HT) migrated to the Bulk, while the high surface energy Polymer (PNDISS) enriches at the substrate/ble...
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Annealing temperature dependence of the efficiency and vertical phase segregation of Polymer/Polymer Bulk heterojunction photovoltaic cells
Applied Physics Letters J. Vac. Sci. Technol. B, 2014Co-Authors: Nishit M. Murari, Ye-jin Hwang, Matthew J. Crane, Tae Shik Earmme, Samson A JenekheAbstract:Articles you may be interested in Improved efficiency of flexible Polymer solar cells with a non-annealing active layer J. Renewable Sustainable Energy 6, 023128 (2014); 10.1063/1.4873998 Raman and low temperature photoluminescence spectroscopy of Polymer disorder in Bulk heterojunction solar cell films Appl. Phys. Lett. 101, 083302 (2012); 10.1063/1.4747320 A low band gap, solution processable oligothiophene with a dialkylated diketopyrrolopyrrole chromophore for use in Bulk heterojunction solar cells Appl. Phys. Lett. 94, 103301 (2009); 10.1063/1.3086897 The use of thermal initiator to make organic Bulk heterojunction solar cells with a good percolation path Appl. Phys. Lett. 93, 043304 (2008); 10.1063/1.2965468 Imaging layers for the directed assembly of block coPolymer films: Dependence of the physical and chemical properties of patterned Polymer brushes on brush molecular weight We report observation of annealing temperature-induced simultaneous vertical phase segregation and large enhancement of power conversion efficiency (PCE) of all-Polymer Bulk heterojunction (BHJ) solar cells composed of a poly(3-hexylthiophene) (P3HT) donor and a naphthalene diimide-selenolo[3,2-b]selenophene coPolymer (PNDISS) acceptor. The PCE of P3HT:PNDISS BHJ devices increased over 50-fold from 0.04% to 2.03% when the annealing temperature was increased from 50 to 150 C. Absorption spectroscopy and photoluminescence quenching experiments provide evidence of increasing phase segregation of the Polymer/Polymer blend films with increasing annealing temperature. Field-effect charge transport, contact angle, surface energy, and variable angle ellipsometry measurements on the P3HT:PNDISS blend films showed that thermal annealing induced vertical phase segregation, whereby the low surface energy Polymer (P3HT) migrated to the Bulk, while the high surface energy Polymer (PNDISS) enriches at the substrate/blend interface. V C 2014 AIP Publishing LLC. [http://dx.doi.org/10.1063/1.4880941] Organic solar cells have been extensively investigated for energy harvesting due to their low-cost, facile, and sus-tainable processing attributes. Bulk-heterojunction (BHJ) organic solar cells have provided the highest efficiencies to date by enhancing the donor/acceptor interface area to drive efficient exciton dissociation. 1–5 Control of compositional and morphological structure through lateral and vertical phase segregation has enabled high efficiencies (>9%) in Polymer/fullerene devices and proven phase segregation to be a critical parameter for high efficiencies. 6–9 BHJ all-Polymer solar cells consisting of blends of a donor Polymer and an acceptor Polymer have recently emerged with promis-ing efficiencies of 3%–4%. 10–12 However, phase segregation in Polymer/Polymer blend BHJ devices has not yet been fully investigated, despite the versatile, low-cost framework, it provides for highly efficient solar cells. 12,13
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n type naphthalene diimide biselenophene coPolymer for all Polymer Bulk heterojunction solar cells
Macromolecules, 2012Co-Authors: Ye-jin Hwang, Nishit M. Murari, Samson A JenekheAbstract:A new solution processable n-type Polymer semiconductor is synthesized and characterized for use as an electron acceptor material in all-Polymer Bulk heterojunction solar cells. The new crystalline coPolymer, poly(naphthalene diimide-alt-biselenophene) (PNDIBS), has a high field-effect electron mobility (0.07 cm2/(V s)) and broad visible-near-infrared absorption band with an optical band gap of 1.4 eV. All-Polymer Bulk heterojunction solar cells comprised of PNDIBS acceptor and poly(3-hexylthiophene) donor have a photovoltaic power conversion efficiency of 0.9%. The external quantum efficiency spectrum of the all-Polymer solar cells shows that about 19% of the photocurrent comes from the near-infrared (700–900 nm) light harvesting by the new n-type Polymer semiconductor.
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n-Type Naphthalene Diimide–Biselenophene CoPolymer for All-Polymer Bulk Heterojunction Solar Cells
Macromolecules, 2012Co-Authors: Ye-jin Hwang, Nishit M. Murari, Samson A JenekheAbstract:A new solution processable n-type Polymer semiconductor is synthesized and characterized for use as an electron acceptor material in all-Polymer Bulk heterojunction solar cells. The new crystalline coPolymer, poly(naphthalene diimide-alt-biselenophene) (PNDIBS), has a high field-effect electron mobility (0.07 cm2/(V s)) and broad visible-near-infrared absorption band with an optical band gap of 1.4 eV. All-Polymer Bulk heterojunction solar cells comprised of PNDIBS acceptor and poly(3-hexylthiophene) donor have a photovoltaic power conversion efficiency of 0.9%. The external quantum efficiency spectrum of the all-Polymer solar cells shows that about 19% of the photocurrent comes from the near-infrared (700–900 nm) light harvesting by the new n-type Polymer semiconductor.
Nishit M. Murari - One of the best experts on this subject based on the ideXlab platform.
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Annealing temperature dependence of the efficiency and vertical phase segregation of Polymer/Polymer Bulk heterojunction photovoltaic cells
Applied Physics Letters, 2014Co-Authors: Nishit M. Murari, Ye-jin Hwang, Matthew J. Crane, Tae Shik Earmme, Samson A JenekheAbstract:We report observation of annealing temperature-induced simultaneous vertical phase segregation and large enhancement of power conversion efficiency (PCE) of all-Polymer Bulk heterojunction (BHJ) solar cells composed of a poly(3-hexylthiophene) (P3HT) donor and a naphthalene diimide-selenolo[3,2-b]selenophene coPolymer (PNDISS) acceptor. The PCE of P3HT:PNDISS BHJ devices increased over 50-fold from 0.04% to 2.03% when the annealing temperature was increased from 50 to 150 °C. Absorption spectroscopy and photoluminescence quenching experiments provide evidence of increasing phase segregation of the Polymer/Polymer blend films with increasing annealing temperature. Field-effect charge transport, contact angle, surface energy, and variable angle ellipsometry measurements on the P3HT:PNDISS blend films showed that thermal annealing induced vertical phase segregation, whereby the low surface energy Polymer (P3HT) migrated to the Bulk, while the high surface energy Polymer (PNDISS) enriches at the substrate/ble...
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Annealing temperature dependence of the efficiency and vertical phase segregation of Polymer/Polymer Bulk heterojunction photovoltaic cells
Applied Physics Letters J. Vac. Sci. Technol. B, 2014Co-Authors: Nishit M. Murari, Ye-jin Hwang, Matthew J. Crane, Tae Shik Earmme, Samson A JenekheAbstract:Articles you may be interested in Improved efficiency of flexible Polymer solar cells with a non-annealing active layer J. Renewable Sustainable Energy 6, 023128 (2014); 10.1063/1.4873998 Raman and low temperature photoluminescence spectroscopy of Polymer disorder in Bulk heterojunction solar cell films Appl. Phys. Lett. 101, 083302 (2012); 10.1063/1.4747320 A low band gap, solution processable oligothiophene with a dialkylated diketopyrrolopyrrole chromophore for use in Bulk heterojunction solar cells Appl. Phys. Lett. 94, 103301 (2009); 10.1063/1.3086897 The use of thermal initiator to make organic Bulk heterojunction solar cells with a good percolation path Appl. Phys. Lett. 93, 043304 (2008); 10.1063/1.2965468 Imaging layers for the directed assembly of block coPolymer films: Dependence of the physical and chemical properties of patterned Polymer brushes on brush molecular weight We report observation of annealing temperature-induced simultaneous vertical phase segregation and large enhancement of power conversion efficiency (PCE) of all-Polymer Bulk heterojunction (BHJ) solar cells composed of a poly(3-hexylthiophene) (P3HT) donor and a naphthalene diimide-selenolo[3,2-b]selenophene coPolymer (PNDISS) acceptor. The PCE of P3HT:PNDISS BHJ devices increased over 50-fold from 0.04% to 2.03% when the annealing temperature was increased from 50 to 150 C. Absorption spectroscopy and photoluminescence quenching experiments provide evidence of increasing phase segregation of the Polymer/Polymer blend films with increasing annealing temperature. Field-effect charge transport, contact angle, surface energy, and variable angle ellipsometry measurements on the P3HT:PNDISS blend films showed that thermal annealing induced vertical phase segregation, whereby the low surface energy Polymer (P3HT) migrated to the Bulk, while the high surface energy Polymer (PNDISS) enriches at the substrate/blend interface. V C 2014 AIP Publishing LLC. [http://dx.doi.org/10.1063/1.4880941] Organic solar cells have been extensively investigated for energy harvesting due to their low-cost, facile, and sus-tainable processing attributes. Bulk-heterojunction (BHJ) organic solar cells have provided the highest efficiencies to date by enhancing the donor/acceptor interface area to drive efficient exciton dissociation. 1–5 Control of compositional and morphological structure through lateral and vertical phase segregation has enabled high efficiencies (>9%) in Polymer/fullerene devices and proven phase segregation to be a critical parameter for high efficiencies. 6–9 BHJ all-Polymer solar cells consisting of blends of a donor Polymer and an acceptor Polymer have recently emerged with promis-ing efficiencies of 3%–4%. 10–12 However, phase segregation in Polymer/Polymer blend BHJ devices has not yet been fully investigated, despite the versatile, low-cost framework, it provides for highly efficient solar cells. 12,13
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n type naphthalene diimide biselenophene coPolymer for all Polymer Bulk heterojunction solar cells
Macromolecules, 2012Co-Authors: Ye-jin Hwang, Nishit M. Murari, Samson A JenekheAbstract:A new solution processable n-type Polymer semiconductor is synthesized and characterized for use as an electron acceptor material in all-Polymer Bulk heterojunction solar cells. The new crystalline coPolymer, poly(naphthalene diimide-alt-biselenophene) (PNDIBS), has a high field-effect electron mobility (0.07 cm2/(V s)) and broad visible-near-infrared absorption band with an optical band gap of 1.4 eV. All-Polymer Bulk heterojunction solar cells comprised of PNDIBS acceptor and poly(3-hexylthiophene) donor have a photovoltaic power conversion efficiency of 0.9%. The external quantum efficiency spectrum of the all-Polymer solar cells shows that about 19% of the photocurrent comes from the near-infrared (700–900 nm) light harvesting by the new n-type Polymer semiconductor.
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n-Type Naphthalene Diimide–Biselenophene CoPolymer for All-Polymer Bulk Heterojunction Solar Cells
Macromolecules, 2012Co-Authors: Ye-jin Hwang, Nishit M. Murari, Samson A JenekheAbstract:A new solution processable n-type Polymer semiconductor is synthesized and characterized for use as an electron acceptor material in all-Polymer Bulk heterojunction solar cells. The new crystalline coPolymer, poly(naphthalene diimide-alt-biselenophene) (PNDIBS), has a high field-effect electron mobility (0.07 cm2/(V s)) and broad visible-near-infrared absorption band with an optical band gap of 1.4 eV. All-Polymer Bulk heterojunction solar cells comprised of PNDIBS acceptor and poly(3-hexylthiophene) donor have a photovoltaic power conversion efficiency of 0.9%. The external quantum efficiency spectrum of the all-Polymer solar cells shows that about 19% of the photocurrent comes from the near-infrared (700–900 nm) light harvesting by the new n-type Polymer semiconductor.
Dirk Vanderzande - One of the best experts on this subject based on the ideXlab platform.
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influence of thermal ageing on the stability of Polymer Bulk heterojunction solar cells
Solar Energy Materials and Solar Cells, 2007Co-Authors: Sabine Bertho, T Martens, Laurence Lutsen, Dirk Vanderzande, Jean Manca, I Haeldermans, A Swinnen, Wouter MoonsAbstract:Abstract A new approach is presented in order to improve the thermal stability of Polymer: [6-6]-phenyl C61 butyric acid methyl ester (PCBM) Bulk heterojunction solar cells. The central idea in this approach is the use of a Polymer with high glass transition temperature (Tg), well above the normal operating temperatures of the devices. In this paper, a PPV-derivative with a Tg of 150 °C was used as an electron donor and the thermal stability of the obtained solar cells was compared with solar cells based on the reference material poly[2-methoxy-5-(3′,7′-dimethyloctyloxy)-1,4-phenylene vinylene] (MDMO-PPV) with a Tg of 45 °C. The use of the material with higher glass transition temperature resulted in a significant improvement of the thermal stability of the photovoltaic parameters. Furthermore, a systematic transmission electron microscope (TEM) study demonstrates that the better thermal stability of performance coincides with a more stable active layer morphology. Both improvements are attributed to the reduced free movement of the electron donor material (PCBM) within the active layer of the solar cell.
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Modelling the short-circuit current of Polymer Bulk heterojunction solar cells
Thin Solid Films, 2004Co-Authors: Wim Geens, T Martens, S Borghs, Tom Aernouts, Laurence Lutsen, Robert Mertens, Paul Heremans, Jef Poortmans, Jean Manca, Dirk VanderzandeAbstract:An analytical model has been developed to estimate the short-circuit current density of conjugated Polymer/fullerene Bulk heterojunction solar cells. The model takes into account the solvent-dependent molecular morphology of the donor/acceptor blend, which was revealed by transmission electron microscopy. Field-effect transistors based on single and composite organic layers were fabricated to determine values for the charge carrier mobilities of such films. These values served as input parameters of the model. It is shown that the difference in short-circuit current density that was measured between toluene-cast and chlorobenzene-cast conjugated Polymer/fullerene photovoltaic cells (Appl. Phys. Lett. 78 (2001) 841) could be very well simulated with the model. Moreover, the calculations illustrate how increasing the hole and electron mobilities in the photoactive blend can improve the overall short-circuit current density of the solar cell.
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Modelling the short-circuit current of Polymer Bulk heterojunction solar cells
Thin Solid Films, 2004Co-Authors: Wim Geens, T Martens, S Borghs, Rita Mertens, Tom Aernouts, Laurence Lutsen, Paul Heremans, Jef Poortmans, Jean Manca, Dirk VanderzandeAbstract:An analytical model has been developed to estimate the short-circuit current density of conjugated Polymer/fullerene Bulk heterojunction solar cells. The model takes into account the solvent-dependent molecular morphology of the donor/acceptor blend, which was revealed by transmission electron microscopy. Field-effect transistors based on single and composite organic layers were fabricated to determine values for the charge carrier mobilities of such films. These values served as input parameters of the model. It is shown that the difference in short-circuit current density that was measured between toluene-cast and chlorobenzene-cast conjugated Polymer/fullerene photovoltaic cells (Appl. Phys. Lett. 78 (2001) 841) could be very well simulated with the model. Moreover, the calculations illustrate how increasing the hole and electron mobilities in the photoactive blend can improve the overall short-circuit current density of the solar cell. (C) 2003 Elsevier B.V. All rights reserved.