钝化
双功能
材料科学
钙钛矿(结构)
石墨烯
拉曼光谱
光电流
X射线光电子能谱
钙钛矿太阳能电池
光致发光
化学工程
能量转换效率
光电子学
纳米技术
化学
图层(电子)
有机化学
光学
工程类
物理
催化作用
作者
Elahe Khorshidi,Behzad Rezaei,Dominic Blätte,Ali Buyruk,Manuel A. Reus,Jonas Hanisch,Bernhard Böller,Peter Müller‐Buschbaum,Tayebeh Ameri
出处
期刊:Solar RRL
[Wiley]
日期:2022-03-29
卷期号:6 (7)
被引量:8
标识
DOI:10.1002/solr.202200023
摘要
Passivating the defects and grain boundaries (GBs) of perovskite films at the interface by interface engineering is a promising route to achieve efficient and stable perovskite solar cells (PSCs). Herein, a new type of graphene, that is, hydrophobic graphene quantum dots (HGQDs) containing amide linkages, which consist of carbonyl and dodecyl amine groups, is successfully used as a bifunctional interface modifier to engineer the interface of the perovskite/hole transport layer. A comprehensive characterization including X‐ray photoelectron spectroscopy, Fourier‐transform photocurrent spectroscopy, Raman spectroscopy, photoluminescence spectroscopy, and space‐charge‐limited current measurements is performed to identify the underlying passivation mechanisms. It can be demonstrated that the HGQDs, due to the bifunctional groups containing N and O atoms, effectively passivate the uncoordinated Pb 2+ ions at the perovskite film surface and GBs and consequently induce a lower trap state density. Moreover, HGQDs enhance the quality of the perovskite film which reduces the charge recombination at the interface. Therefore, the power conversion efficiency of PSCs treated with HGQDs is significantly increased from 16.00% to 18.30%, mainly based on the improved open‐circuit voltage and fill factor. Importantly, the HGQDs featuring hydrophobicity due to alkyl chains significantly enhance moisture stability.
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