苝
二亚胺
材料科学
兴奋剂
有机太阳能电池
工作职能
光电子学
氧化物
电导率
纳米技术
聚合物
图层(电子)
化学
分子
复合材料
有机化学
冶金
物理化学
作者
Wei Wang,Xin Li,Mengfei Li,Wentao Zhong,Yubo Yuan,Zhichao Lin,Yuanxin Zhu,Shoujun Zhu,Tingbin Yang,Yongye Liang
出处
期刊:ACS applied nano materials
[American Chemical Society]
日期:2024-08-16
标识
DOI:10.1021/acsanm.4c02157
摘要
In organic solar cells (OSCs), the electron transport layer (ETL) is vital for high performance devices. As a widely used ETL, N-oxide-functionalized perylene-diimide (PDINO) is often limited by its low conductivity. Herein, we develop an improved ETL by doping indole carbonized polymer dots (CPDs) into PDINO. The graphitic N and oxoindole groups of CPDs could increase the self-doping of PDINO. Compared with the pristine PDINO ETL, the PDINO + CPDs ETL shows a more suitable work function and higher conductivity due to the graphitic nature of CPDs and the enhanced self-doping of PDINO. PM6:Y6 OSCs with a 10 nm PDINO + CPDs ETL demonstrate a superior average power conversion efficiency (PCE) (17.0%) compared with OSCs with only a PDINO ETL (15.6%). This improvement in PCE is attributed to the enhanced efficiency of exciton dissociation and reduced charge recombination within the devices. Furthermore, OSCs utilizing PDINO + CPDs ETL display a notable resilience to variations in ETL thickness, maintaining a high average PCE of 15.0% even when the ETL thickness is increased to 70 nm. This work provides a simple interfacial modification strategy to optimize ETLs for OSCs.
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