溅射
材料科学
硒化铜铟镓太阳电池
图层(电子)
太阳能电池
化学计量学
缓冲器(光纤)
异质结
锌黄锡矿
薄膜
光电子学
分析化学(期刊)
纳米技术
化学
捷克先令
电信
计算机科学
有机化学
色谱法
作者
Shengli Zhang,Jianyu Wu,Hongling Guo,Yali Sun,Zhiqiang Zhou,Yi Zhang
标识
DOI:10.1002/pssa.202100585
摘要
CdS thin films are commonly used as buffer layer in Cu 2 ZnSnSe 4 (CZTSe) solar cells inherited from CuInGaSe 2 (CIGS) solar cells. However, in addition to the toxicity problems with Cd in conventional CdS buffer layers, the unfavorable band alignment at the CZTSe/CdS heterojunction confines the further improvement of CZTSe solar cells. ZnSnO (ZTO) is studied in this work as promising buffer layers for CZTSe solar cells. The stoichiometric composition and thickness of the ZTO layer are first optimized by sputtering. Subsequently, the improvement of the performance is demonstrated by sputtering ZTO in Ar gas mixed with H 2 . The effect of H 2 on sputtering ZTO is investigated. The presence of O vacancies in ZTO buffer layer and its effect on carrier transport and device performance are presented. Through optimization, comparable V OC and higher fill factor (FF) are obtained for the CZTSe/ZTO solar cells compared with CZTSe/CdS reference.
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