Open-circuit voltage up to 1.07 V for solution processed small molecule based organic solar cells |
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| Authors: | Wang Ni Miaomiao LiBin Kan Yi ZuoQian Zhang Guankui LongHuanran Feng Xiangjian Wan Yongsheng Chen |
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| Affiliation: | Key Laboratory of Functional Polymer Materials, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Center for Nanoscale Science and Technology, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China |
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| Abstract: | With the goal of increasing the open-circuit voltage, two new solution-processable A–D–A structure small molecule donor materials, named DCAO3TF and DCAO3TCz, using two weak electron-donating units, fluorene and carbazole as the central block have been designed and synthesized for photovoltaic applications. While bulk heterojunction photovoltaic devices based on DCAO3TF:PC61BM and DCAO3TCz:PC61BM as the active layers exhibit moderate power conversion efficiencies of 2.38% and 3.63%, respectively, devices based on DCAO3TF:PC61BM do exhibit an impressively high open-circuit voltage (Voc) up to 1.07 V, which is one of the highest Voc in organic solar cells based on donor:PCBM blend films. |
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| Keywords: | Solution-processed small molecule Organic photovoltaic cell Open-circuit voltage HOMO energy level Thermal annealing |
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