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Performance improvement of polymer solar cells with binary additives induced morphology optimization and interface modification simultaneously
Solar Energy ( IF 6.7 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.solener.2020.03.021
Tingting Dai , Xiong Li , Yingying Zhang , Denghui Xu , Aicong Geng , Jia Zhao , Xiaobai Chen

Abstract Active layer morphology optimization and electrode buffer layer interface modification are commonly used strategies in improving the performance of polymer solar cells (PSCs). In this study, we prepared PTB7: PC71BM bulk heterojunction PSCs with 1,8-diiodooctane (DIO) and polyethylene glycol (PEG) additives, and studied the influence of binary additives on exciton dissociation, charge transport and charge extraction. DIO facilitates donor/acceptor phase separation for efficient exciton dissociation and charge transport. The migration of PEG from active layer to the PEDOT:PSS layer improves the crystallinity of PTB7, optimizes charge transport pathway, and enhances the conductivity of PEDOT:PSS layer. With the combined advantages of binary additives in active layer morphology optimization and anode buffer layer modification, the device exhibits a high short-circuit current density of 20.03 mA/cm2 and an improved power conversion efficiency. Binary additive provides a promising method to optimize active layer morphology and improve interfacial buffer layer of PSCs simultaneously.

中文翻译:

含二元添加剂的聚合物太阳能电池性能改善同时诱导形态优化和界面改性

摘要 活性层形态优化和电极缓冲层界面改性是提高聚合物太阳能电池 (PSC) 性能的常用策略。在本研究中,我们使用 1,8-二碘辛烷 (DIO) 和聚乙二醇 (PEG) 添加剂制备了 PTB7:PC71BM 本体异质结 PSC,并研究了二元添加剂对激子解离、电荷传输和电荷提取的影响。DIO 促进供体/受体相分离,以实现有效的激子解离和电荷传输。PEG从活性层迁移到PEDOT:PSS层提高了PTB7的结晶度,优化了电荷传输途径,增强了PEDOT:PSS层的导电性。结合二元添加剂在活性层形貌优化和阳极缓冲层改性方面的优势,该器件具有 20.03 mA/cm2 的高短路电流密度和更高的功率转换效率。二元添加剂提供了一种有前途的方法来优化活性层形态并同时改善 PSC 的界面缓冲层。
更新日期:2020-05-01
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