Improvement in the Power Conversion Efficiency of Bulk Heterojunction Photovoltaic Device via Thermal Postannealing of Subphthalocyanine:C70 Active Layer
The authors report an efficient organic photovoltaic device based on subphthalocyanine (SubPc):C70 bulk heterojunction (BHJ) via the postannealing treatment. The power conversion efficiency is improved from 4.5% to 5.5% due to the increase in short-circuit current density (JSC) from 8.8 to 12.7 mA/c...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2013-01-01
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| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/2013/585196 |
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| author | Chih-Chien Lee Shun-Wei Liu Ching-Wen Cheng Wei-Cheng Su Chia-Chang Chou Chun-Feng Lin Chin-Ti Chen |
| author_facet | Chih-Chien Lee Shun-Wei Liu Ching-Wen Cheng Wei-Cheng Su Chia-Chang Chou Chun-Feng Lin Chin-Ti Chen |
| author_sort | Chih-Chien Lee |
| collection | DOAJ |
| description | The authors report an efficient organic photovoltaic device based on subphthalocyanine (SubPc):C70 bulk heterojunction (BHJ) via the postannealing treatment. The power conversion efficiency is improved from 4.5% to 5.5% due to the increase in short-circuit current density (JSC) from 8.8 to 12.7 mA/cm2 with the expense of decreased fill factor from 52% to 42%. From external quantum efficiency measurements, the spectral shape-independent enhancement over the entire spectrum suggests that the increased JSC mainly originates from improved charge collection efficiency. To confirm this inference, the hole and electron mobilities in the BHJ are estimated from the space-charge limited current, showing improved transport properties at the optimum temperature. Moreover, the morphologic change is also studied as a function of annealing temperature. A larger grain size is observed with increasing temperature due to the phase separation of SubPc and C70. However, at higher temperatures the strong aggregation of C70 molecules may interrupt the pathway of SubPc, resulting in hindered charge transport and, hence, reduced JSC. |
| format | Article |
| id | doaj-art-c910d365057a49cdb09fd7ffd2e80670 |
| institution | Kabale University |
| issn | 1110-662X 1687-529X |
| language | English |
| publishDate | 2013-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Photoenergy |
| spelling | doaj-art-c910d365057a49cdb09fd7ffd2e806702025-02-03T07:23:35ZengWileyInternational Journal of Photoenergy1110-662X1687-529X2013-01-01201310.1155/2013/585196585196Improvement in the Power Conversion Efficiency of Bulk Heterojunction Photovoltaic Device via Thermal Postannealing of Subphthalocyanine:C70 Active LayerChih-Chien Lee0Shun-Wei Liu1Ching-Wen Cheng2Wei-Cheng Su3Chia-Chang Chou4Chun-Feng Lin5Chin-Ti Chen6Department of Electronic Engineering, National Taiwan University of Science and Technology, Taipei 10607, TaiwanDepartment of Electronic Engineering, Ming Chi University of Technology, New Taipei City 24301, TaiwanDepartment of Electronic Engineering, National Taiwan University of Science and Technology, Taipei 10607, TaiwanDepartment of Electronic Engineering, National Taiwan University of Science and Technology, Taipei 10607, TaiwanDepartment of Electronic Engineering, National Taiwan University of Science and Technology, Taipei 10607, TaiwanDepartment of Electronic Engineering, Ming Chi University of Technology, New Taipei City 24301, TaiwanInstitute of Chemistry, Academia Sinica, Taipei 11529, TaiwanThe authors report an efficient organic photovoltaic device based on subphthalocyanine (SubPc):C70 bulk heterojunction (BHJ) via the postannealing treatment. The power conversion efficiency is improved from 4.5% to 5.5% due to the increase in short-circuit current density (JSC) from 8.8 to 12.7 mA/cm2 with the expense of decreased fill factor from 52% to 42%. From external quantum efficiency measurements, the spectral shape-independent enhancement over the entire spectrum suggests that the increased JSC mainly originates from improved charge collection efficiency. To confirm this inference, the hole and electron mobilities in the BHJ are estimated from the space-charge limited current, showing improved transport properties at the optimum temperature. Moreover, the morphologic change is also studied as a function of annealing temperature. A larger grain size is observed with increasing temperature due to the phase separation of SubPc and C70. However, at higher temperatures the strong aggregation of C70 molecules may interrupt the pathway of SubPc, resulting in hindered charge transport and, hence, reduced JSC.http://dx.doi.org/10.1155/2013/585196 |
| spellingShingle | Chih-Chien Lee Shun-Wei Liu Ching-Wen Cheng Wei-Cheng Su Chia-Chang Chou Chun-Feng Lin Chin-Ti Chen Improvement in the Power Conversion Efficiency of Bulk Heterojunction Photovoltaic Device via Thermal Postannealing of Subphthalocyanine:C70 Active Layer International Journal of Photoenergy |
| title | Improvement in the Power Conversion Efficiency of Bulk Heterojunction Photovoltaic Device via Thermal Postannealing of Subphthalocyanine:C70 Active Layer |
| title_full | Improvement in the Power Conversion Efficiency of Bulk Heterojunction Photovoltaic Device via Thermal Postannealing of Subphthalocyanine:C70 Active Layer |
| title_fullStr | Improvement in the Power Conversion Efficiency of Bulk Heterojunction Photovoltaic Device via Thermal Postannealing of Subphthalocyanine:C70 Active Layer |
| title_full_unstemmed | Improvement in the Power Conversion Efficiency of Bulk Heterojunction Photovoltaic Device via Thermal Postannealing of Subphthalocyanine:C70 Active Layer |
| title_short | Improvement in the Power Conversion Efficiency of Bulk Heterojunction Photovoltaic Device via Thermal Postannealing of Subphthalocyanine:C70 Active Layer |
| title_sort | improvement in the power conversion efficiency of bulk heterojunction photovoltaic device via thermal postannealing of subphthalocyanine c70 active layer |
| url | http://dx.doi.org/10.1155/2013/585196 |
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