Comprehensive Insight into the Structure Contribution of A2‐A1‐D‐A1‐A2 Acceptor to Performance of P3HT Solar Cells
Comprehensive Insight into the Structure Contribution of A2‐A1‐D‐A1‐A2 Acceptor to Performance of P3HT Solar Cells
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DOI：
10.1002/aenm.202303976
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发表时间：
2024-02
影响因子：
27.8
通讯作者：
Yanfang Geng;You Chen;Mengzhen Du;Hongbo Wu;Zaifei Ma;Bo Xiao;Helin Wang;Ailing Tang;
中科院分区：
文献类型：
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作者：
Yanfang Geng;You Chen;Mengzhen Du;Hongbo Wu;Zaifei Ma;Bo Xiao;Helin Wang;Ailing Tang;
聚（3 -己基噻吩）（P3HT）作为最受欢迎的低成本聚合物之一，非常适合有机太阳能电池的商业化，但由于匹配的非富勒烯受体（nfa）有限，其功率转换效率（PCE）较低。一个限制增强但尚未解决的重要原因是微妙的结构修改对明显的性能变化的未公开贡献。结合以往的报道和本工作，本文设计了基于母体BTA3的A2‐A1‐D‐A1‐A2型nfa，包括A2基上的苯取代（即Bn修饰）、A1基上的氟取代（即F修饰）和D基上的噻吩[3,2‐b]取代（即TT修饰）。最后发现，加入这些nfa的P3HT二元器件在分子光电性能、共混形态特征和电荷产生过程等方面都发生了意想不到的变化。Bn、F和TT的三重改性充分发挥了它们的独特优势，使PCE提高了60%。据了解，所获得的最佳PCE是A2‐A1‐D‐A1‐A2型nfa的最高值之一。这项研究提供了更清晰的见解，在A2‐A1‐D‐A1‐A2受体与P3HT匹配的高性能有机光伏上的合理取代。
Poly(3‐hexylthiophene) (P3HT) acting as one of the most popular and low‐cost polymers is quite suitable for commercialization of organic solar cells but suffers from low power conversion efficiency (PCE) because of the limited matching non‐fullerene acceptors (NFAs). One important reason that restricts the enhancement but remains unresolved is the undisclosed contributions of the subtle structure modification to the obvious performance change. In combination with the previous reports and this work, herein A2‐A1‐D‐A1‐A2 type NFAs with single, dual, and triple modifications based on parent BTA3 is designed, including benzyl‐substitution on A2 group (namely Bn modification), fluorine‐substitution on A1 group (namely F modification), and thieno[3,2‐b]thiophene‐substitution on D group (namely TT modification). It is finally found that the binary devices of P3HT with these NFAs underwent unexpected variations in the aspect of molecular optoelectronic property, blend morphological feature and charge generation process. The triple modification (including Bn, F, and TT) gives full play to their unique advantages and consequently increases PCE by 60%. To the knowledge, the obtained optimal PCE is one of the highest values for A2‐A1‐D‐A1‐A2 type NFAs. This study provides clearer insights into the rational substitutions on the A2‐A1‐D‐A1‐A2 acceptors matched with P3HT for high‐performance organic photovoltaics.