苝
材料科学
有机太阳能电池
有机半导体
二亚胺
活动层
能量转换效率
图层(电子)
薄膜
化学工程
光化学
纳米技术
电子受体
光伏系统
异质结
佩多:嘘
轨道能级差
有机电子学
太阳能电池
溶解过程
光电子学
光活性层
有机化学
分子
复合材料
化学
工程类
聚合物
作者
Ming Hu,Youdi Zhang,Xia Liu,Xiaohong Zhao,Yu Hu,Zhenyu Yang,Changduk Yang,Zhongyi Yuan,Yiwang Chen
标识
DOI:10.1021/acsami.1c06192
摘要
Layer-by-layer (LBL) sequential solution processing of the active layer has been proven as an effective strategy to improve the performance of organic solar cells (OSCs), which could adjust vertical phase separation and improve device performance. Although perylene diimide (PDI) derivatives are typical acceptors with excellent photoelectric properties, there are few studies on PDI-based LBL OSCs. Herein, three PDI acceptors (TBDPDI-C5, TBDPDI-C11, and SdiPDI) were used to fabricate LBL and bulk heterojunction (BHJ) OSCs, respectively. A series of studies including device optimization, photoluminescence (PL) quenching, dependence of light intensity, carrier mobility, atomic force microscopy (AFM), transmission electron microscopy (TEM), grazing-incidence wide-angle X-ray scattering (GIWAXS), and depth analysis X-ray photoelectron spectroscopy (DXPS) were carried out to make clear the difference of the PDI-based LBL and BHJ OSCs. The results show that LBL OSCs possess better charge transport, higher and more balanced carrier mobility, less exciton recombination loss, more favorable film morphology, and proper vertical component distribution. Therefore, all the three PDI acceptor-based LBL OSCs exhibit higher performance than their BHJ counterparts. Among them, TBDPDI-C5 performs best with a power conversion efficiency of 6.11% for LBL OSCs, higher than its BHJ OSC (5.14%). It is the first time for PDI small molecular acceptors to fabricate high-efficiency OSCs by using an LBL solution-processed method.
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