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Over 14% efficiency all-polymer solar cells enabled by a low bandgap polymer acceptor with low energy loss and efficient charge separation
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2020-10-06 , DOI: 10.1039/d0ee01828g Qunping Fan 1, 2, 3, 4 , Qiaoshi An 5, 6, 7, 8 , Yuanbao Lin 9, 10, 11, 12 , Yuxin Xia 13, 14, 15, 16, 17 , Qian Li 18, 19, 20, 21, 22 , Ming Zhang 8, 23, 24, 25 , Wenyan Su 1, 2, 3, 4, 26 , Wenhong Peng 1, 2, 3, 4, 27 , Chunfeng Zhang 18, 19, 20, 21, 22 , Feng Liu 8, 23, 24, 25 , Lintao Hou 14, 26, 28, 29, 30 , Weiguo Zhu 27, 31, 32, 33, 34 , Donghong Yu 35, 36, 37, 38, 39 , Min Xiao 18, 19, 20, 21, 22 , Ellen Moons 4, 40, 41, 42 , Fujun Zhang 8, 43, 44, 45 , Thomas D. Anthopoulos 9, 10, 11, 12 , Olle Inganäs 13, 14, 15, 16, 17 , Ergang Wang 1, 2, 3, 4, 27
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2020-10-06 , DOI: 10.1039/d0ee01828g Qunping Fan 1, 2, 3, 4 , Qiaoshi An 5, 6, 7, 8 , Yuanbao Lin 9, 10, 11, 12 , Yuxin Xia 13, 14, 15, 16, 17 , Qian Li 18, 19, 20, 21, 22 , Ming Zhang 8, 23, 24, 25 , Wenyan Su 1, 2, 3, 4, 26 , Wenhong Peng 1, 2, 3, 4, 27 , Chunfeng Zhang 18, 19, 20, 21, 22 , Feng Liu 8, 23, 24, 25 , Lintao Hou 14, 26, 28, 29, 30 , Weiguo Zhu 27, 31, 32, 33, 34 , Donghong Yu 35, 36, 37, 38, 39 , Min Xiao 18, 19, 20, 21, 22 , Ellen Moons 4, 40, 41, 42 , Fujun Zhang 8, 43, 44, 45 , Thomas D. Anthopoulos 9, 10, 11, 12 , Olle Inganäs 13, 14, 15, 16, 17 , Ergang Wang 1, 2, 3, 4, 27
Affiliation
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Obtaining both high open-circuit voltage (Voc) and short-circuit current density (Jsc) has been a major challenge for efficient all-polymer solar cells (all-PSCs). Herein, we developed a polymer acceptor PF5-Y5 with excellent optical absorption capability (onset extending to ∼880 nm and maximum absorption coefficient exceeding 105 cm−1 in a film), high electron mobility (3.18 × 10−3 cm2 V−1 s−1) and high LUMO level (−3.84 eV) to address such a challenge. As a result, the PBDB-T:PF5-Y5-based all-PSCs achieved a high power conversion efficiency of up to 14.45% with both a high Voc (0.946 V) and a high Jsc (20.65 mA cm−2), due to the high and broad absorption coverage, small energy loss (0.57 eV) and efficient charge separation and transport in the device, which are among the best values in the all-PSC field. In addition, the all-PSC shows a ∼15% improvement in PCE compared to its counterpart small molecule acceptor (Y5)-based device. Our results suggest that PF5-Y5 is a very promising polymer acceptor candidate for applications in efficient all-PSCs.
中文翻译：
低带隙聚合物受体实现了14％以上的效率的全聚合物太阳能电池，具有低能量损失和有效的电荷分离
对于高效的全聚合物太阳能电池（all-PSC）而言，获得高的开路电压（V oc）和短路电流密度（J sc）一直是一项重大挑战。在本文中，我们开发受体PF5-Y5的聚合物具有优异的光学吸收能力（发病延伸到~880 nm和最大吸收系数超过10 5厘米-1中的膜），高电子迁移率（3.18×10 -3厘米2 V - 1 s -1）和高LUMO电平（-3.84 eV）来应对这一挑战。结果，基于PBDB-T：PF5-Y5的全PSC在高V oc的情况下实现了高达14.45％的高功率转换效率（0.946 V）和高J sc（20.65 mA cm -2），这归因于高和宽的吸收覆盖范围，小的能量损失（0.57 eV）以及器件中有效的电荷分离和传输，这些都是最佳的全PSC字段。此外，与基于PCS的小分子受体（Y5）相比，全PCC的PCE改善了约15％。我们的结果表明，PF5-Y5是在高效全PSC中应用的非常有希望的聚合物受体候选物。
更新日期：2020-11-03
中文翻译：
低带隙聚合物受体实现了14％以上的效率的全聚合物太阳能电池，具有低能量损失和有效的电荷分离
对于高效的全聚合物太阳能电池（all-PSC）而言，获得高的开路电压（V oc）和短路电流密度（J sc）一直是一项重大挑战。在本文中，我们开发受体PF5-Y5的聚合物具有优异的光学吸收能力（发病延伸到~880 nm和最大吸收系数超过10 5厘米-1中的膜），高电子迁移率（3.18×10 -3厘米2 V - 1 s -1）和高LUMO电平（-3.84 eV）来应对这一挑战。结果，基于PBDB-T：PF5-Y5的全PSC在高V oc的情况下实现了高达14.45％的高功率转换效率（0.946 V）和高J sc（20.65 mA cm -2），这归因于高和宽的吸收覆盖范围，小的能量损失（0.57 eV）以及器件中有效的电荷分离和传输，这些都是最佳的全PSC字段。此外，与基于PCS的小分子受体（Y5）相比，全PCC的PCE改善了约15％。我们的结果表明，PF5-Y5是在高效全PSC中应用的非常有希望的聚合物受体候选物。
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