材料科学
活动层
光伏系统
退火(玻璃)
富勒烯
化学工程
有机太阳能电池
能量转换效率
光活性层
挥发
聚合物
纳米技术
聚合物太阳能电池
图层(电子)
光电子学
有机化学
复合材料
化学
工程类
薄膜晶体管
生物
生态学
作者
Runnan Yu,Huifeng Yao,Zhenyu Chen,Jingmin Xin,Hong Lei,Ye Xu,Yan Zu,Wei Ma,Jianhui Hou
标识
DOI:10.1002/adma.201900477
摘要
Fine-tuning of the nanoscale morphologies of the active layers in polymer solar cells (PSCs) through various techniques plays a vital role in improving the photovoltaic performance. However, for emerging nonfullerene (NF) PSCs, the morphology optimization of the active-layer films empirically follows the methods originally developed in fullerene-based blends and lacks systematic studies. In this work, two solid additives with different volatilities, SA-4 and SA-7, are applied to investigate their influence on the morphologies and photovoltaic performances of NF-PSCs. Although both solid additives effectively promote the molecular packing of the NF acceptors, due to the higher volatility of SA-4, the devices processed with SA-4 exhibit a power conversion efficiency of 13.5%, higher than that of the control devices, and the devices processed with SA-7 exhibit poor performances. Through a series of detailed morphological analyses, it is found that the volatilization of SA-4 after thermal annealing is beneficial for the self-assembly packing of acceptors, while the residuals due to the incomplete volatilization of SA-7 have a negative effect on the film morphology. The results delineate the feasibility of applying volatilizable solid additives and provide deeper insights into the working mechanism, establishing guidelines for further material design of solid additives.
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