锌黄锡矿
材料科学
扩散
兴奋剂
图层(电子)
化学工程
合金
相(物质)
太阳能电池
光伏
碱金属
纳米技术
冶金
捷克先令
光伏系统
光电子学
化学
热力学
有机化学
生态学
工程类
物理
生物
作者
Kee‐Jeong Yang,Sammi Kim,Se‐Yun Kim,Dae‐Ho Son,Jaebaek Lee,Young‐Ill Kim,Shi‐Joon Sung,Dae‐Hwan Kim,Temujin Enkhbat,Jun Ho Kim,Juran Kim,William Jo,Jin‐Kyu Kang
标识
DOI:10.1002/adfm.202102238
摘要
Abstract Improving the efficiency of kesterite (Cu 2 ZnSn(S,Se) 4 ; CZTSSe) solar cells requires understanding the effects of Na doping. This paper investigates these effects by applying a NaF layer at various positions within precursors. The NaF position is important because Na produces Na‐related defects in the absorber and suppresses the formation of intrinsic defects. By investigating precursors with various NaF positions, the sulfo‐selenization mechanism and the characteristics of defect formation are confirmed. Applying a NaF layer onto a Zn layer in a CZTSSe precursor limits Zn diffusion and suppresses Cu‐Zn alloy formation, thus changing the sulfo‐selenization mechanism. In addition, the surface NaF layer provides reactive Se and S to the absorber layer by generating Na 2 Se x and Na 2 S x liquid phases during sulfo‐selenization, thus limiting the incorporation of Na into the absorber and reducing the Na effects. Efficiency values of 11.16% and 11.19% are obtained for a flexible CZTSSe solar cell by applying NaF between the Zn layer and back contact and between the Cu and Sn layers, respectively. This study presents methods for doping with alkali metals and improving the efficiency of photovoltaics.
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