钝化
钙钛矿(结构)
材料科学
结晶度
化学工程
成核
图层(电子)
表面改性
热稳定性
能量转换效率
光电子学
纳米技术
化学
复合材料
有机化学
工程类
作者
Chengbo Tian,Kebin Lin,Jianxun Lu,Wenjing Feng,Peiquan Song,Liqiang Xie,Zhanhua Wei
标识
DOI:10.1002/smtd.201900476
摘要
Abstract Fullerene derivatives, especially after purposely functionalization, have potential to efficiently passivate interfacial defects between perovskites and electron transport layers. In this work, a fullerene derivative with amine functional group, 2,5‐diphenyl C 60 fulleropyrrolidine (DPC 60 ), is synthesized and employed as an interfacial layer between a perovskite and SnO 2 in planar perovskite solar cells (PSCs). The cis ‐configuration and the specific amine group of DPC 60 effectively enhance the chemical interaction between the perovskite and DPC 60 , promoting the passivation of perovskite defects at the interface. The suitable energy level of DPC 60 and the improved conductivity of the SnO 2 /DPC 60 film facilitate the electron extraction from the perovskite layer. As a result, PSCs incorporated with DPC 60 reach a PCE of 20.4% with high reproducibility, which is much higher than that of the bare SnO 2 based devices (18.8%). Furthermore, the hydrophobic DPC 60 layer suppresses heterogeneous nucleation and improves the crystallinity of the perovskite film, resulting in better device stability, retaining 82% of its initial efficiency after 200 h of 1 sun continuous irradiation and thermal ageing (55 ± 5 °C).
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