材料科学
钙钛矿(结构)
欧姆接触
光电子学
能量转换效率
基质(水族馆)
图层(电子)
电极
载流子
纳米技术
化学工程
化学
海洋学
地质学
工程类
物理化学
作者
Liujin Lin,Zhenhai Yang,Ershuai Jiang,Zilei Wang,Yan Jin,Nan Li,Zenggui Wang,Yuqian Ai,Chunshui Shou,Baojie Yan,Yuejin Zhu,Jiang Sheng,Jichun Ye
标识
DOI:10.1021/acsaem.9b00845
摘要
Electron-transport layer (ETL) that promotes charge carrier separation and electron extraction is a key component of perovskite solar cells (PSCs). Here, we report a simple approach for improving carrier collection efficiency of PSCs by the ZnO-modified ITO in a low-temperature solution process. With the inset of a ZnO layer between the ITO substrate and the SnO2 ETL, the adverse energy band alignment can be eliminated and thus an Ohmic contact between the ITO and SnO2 ETL can be expected. Additionally, the scanning electron microscope images show that the SnO2 film deposited on the ZnO-modified ITO substrate has a lower surface roughness than those directly on the ITO, contributing to the formation of larger grain sizes and better crystalline properties of perovskite. On the basis of photoluminescence and impedance spectrum measurements, the addition of ZnO modification layer facilitates the efficient separation and transportation of photogenerated carriers from the perovskite absorber due to the improved contact resistance and electrical conductivity of ETL. Through such a simple approach, the PSC with the highest power conversion efficiency of 20.45% has been obtained. Our work highlights the importance of electrode/ETL contact and paves the way for further optimizing the performances of PSCs.
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