材料科学
有机太阳能电池
光伏系统
能量转换效率
聚合物太阳能电池
接受者
带隙
富勒烯
开路电压
光电子学
异质结
电压
化学工程
化学物理
聚合物
化学
有机化学
复合材料
电气工程
物理
工程类
凝聚态物理
作者
Hui Kang,Bing Zheng,Yanxun Li,Shilin Li,Huiqiong Zhou,Lijun Huo,Yuan Zhang
出处
期刊:Solar RRL
[Wiley]
日期:2022-01-13
卷期号:6 (4)
被引量:4
标识
DOI:10.1002/solr.202101040
摘要
Multi‐component organic solar cells (OSCs) composing of more than two donor and acceptor materials have attracted increasing attention, due to the possibilities to further mitigate voltage loss (Δ V oc ) for the gain of open‐circuit voltage ( V oc ). However, the control of phase morphology in multi‐component blend systems that critically impacts Δ V oc and the ultimate power conversion efficiency (PCE) is still a challenge. Here, we report a quaternary blend‐based strategy for non‐fullerene OSCs by using two polymer donors (PM6 and L20) along with acceptors of a non‐fullerene (Y6) and PC 71 BM, leading to concurrent improvements of the V oc , device fill factor and eventual PCE. The quaternary OSC exhibits the advantages of a higher charge collection efficiency, expedited charge carrier sweep‐out, and reduced charge recombination losses. The suppression on Δ V oc is attributed to the reduced radiative recombination loss below the bandgap (0.143 V) and non‐radiative voltage loss (0.216 V). These properties are linked to synergies of modified energetics and film morphology of the quaternary blends. This work demonstrates that incorporating suitable donor and acceptor guest molecules to organic binary blend systems is a highly viable approach for lowering the energy loss in organic bulk heterojunctions towards the boost of photovoltaic performance for realistic energy conversion applications.
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