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Rational Design of 2D p–π Conjugated Polysquaraines for Both Fullerene and Nonfullerene Polymer Solar Cells
Macromolecular Chemistry and Physics ( IF 2.5 ) Pub Date : 2019-11-26 , DOI: 10.1002/macp.201900439
Qi Xiao 1 , Yanxun Li 2 , Mengmeng Han 3 , Fei Wu 4 , Xuanye Leng 2 , Dongyang Zhang 5 , Xuning Zhang 5 , Shuo Yang 2 , Yuan Zhang 5 , Zhen Li 3 , Huiqiong Zhou 2 , Zhong'an Li 1, 3
Affiliation  

So far, squaraine‐based polymer donors have been less explored for the bulk heterojunction (BHJ) polymer solar cells. In this work, two new p–π conjugated polysquaraines (PASQ‐BDT1 and PASQ‐BDT2) with different electron‐rich subunits on the squaraine skeleton are rationally developed as new polymer donors based on the 2D structure design concept. PASQ‐BDT2 with N,N‐diisobutylaniline subunits shows superior device performances in both fullerene and nonfullerene PSCs compared to PASQ‐BDT1 containing triphenylamine subunits, with power conversion efficiencies (PCEs) of 4.34% and 3.72%, respectively, owing to increased light‐harvesting ability and more favorable nanoscale morphology in the BHJ films. Moreover, its demonstrated that solvent effects can play an effective role in elevating the device performance. For the PASQ‐BDT2/PC71BM blend, the PCE is improved from 3.19% to 4.34% after solvent vapor annealing treatment, mainly attributed to the optimized film morphology and increased hole mobility. More interestingly, when the processing solvent for nonfullerene devices is changed from chlorobenzene to chloroform, a significant enhancement on PCE from 1.96% to 3.72% is yielded for the PASQ‐BDT2/ITIC blend, due to suppressed charge recombination and enhanced crystallinity in the chloroform‐processed BHJ films.

中文翻译:

富勒烯和非富勒烯聚合物太阳能电池的二维p-π共轭多方晶的合理设计

到目前为止,对于本体异质结(BHJ)聚合物太阳能电池,基于方酸的聚合物供体的研究较少。在这项工作中,基于二维结构设计概念,合理地开发了两个在方酸骨架上具有不同富电子亚基的p-π共轭多方扁晶(PASQ-BDT1PASQ-BDT2)。PASQ-BDT2ÑÑ -diisobutylaniline亚基显示在两个富勒烯优良器件性能和nonfullerene的PSC相比PASQ-BDT1含有三苯胺亚基的BHJ薄膜具有更高的光收集能力和更有利的纳米级形态,其功率转换效率(PCE)分别为4.34%和3.72%。此外,它证明了溶剂效应可以在提高器件性能方面发挥有效作用。对于PASQ-BDT2 / PC 71 BM共混物,溶剂蒸汽退火处理后PCE从3.19%提高到4.34%,这主要归因于优化的膜形态和增加的空穴迁移率。更有趣的是,当将非富勒烯装置的加工溶剂从氯苯更改为氯仿时,PASQ-BDT2的PCE将从1.96%显着提高到3.72%/ ITIC共混物,这是由于在氯仿处理的BHJ膜中抑制了电荷重组并增强了结晶度。
更新日期:2019-11-26
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