| 基于苯并三氮唑π-桥单元协同高效率和低能量损失的全小分子有机太阳电池（英文） |
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| 作者姓名： | 郭静 胡克 邱贝贝 杨登宸 李骁骏 章津源 孟磊 张占军 李永舫 |
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| 作者单位： | 1. School of Chemical Science, University of Chinese Academy of Sciences;2. Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences;3. Key Laboratory of Solid State Optoelectronic Devices of Zhejiang Province, College of Physics and Electronic Information Engineering, Zhejiang Normal University;4. Laboratory of Advanced Optoelectronic Materials, Suzhou Key Laboratory of Novel Semiconductor-optoelectronics Materials and Devices, College of Chemistry, Chemical Engineering and Materials Science, Soochow University |
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| 基金项目： | supported by the National Key Research and Development Program of China (2019YFA0705900)；;the National Natural Science Foundation of China (51820105003, 21734008, 61904181, 52173188 and 52103243)；;the Basic and Applied Basic Research Major Program of Guangdong Province (2019B030302007)； |
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| 摘 要： | 降低电压损失(Vloss)是有机光伏电池未来商业化应用面临的关键挑战之一. Vloss一般由活性层材料的光学带隙和器件的开路电压(Voc)之差定义,而Voc则由给受体之间的最低未占据分子轨(LUMO)和最高占据分子轨道(HOMO)之间的能级差决定.本文通过引入苯并三唑(BTz)π-桥单元,利用末端调控策略合成了两种A-π-D-π-A型小分子给体SM-BTz-1和SM-BTz-2.结果显示, BTz π-桥单位显著降低了小分子给体的HOMO能级,使其具有较高的Voc和载流子迁移率,实现了高效率与低能量损失(小于0.5 e V)之间的平衡.最终,以SM-BTz-2为给体, Y6为受体的全小分子有机太阳能电池Voc为0.91 V,短路电流密度(Jsc)为22.8 m A cm-2,填充因子为68%,能量转化效率为14.12%.此外,该工作也进一步说明了苯并三唑π-桥单元是提高载流子迁移率,降低能量损失的有效构建单元.
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