碱金属掺杂对CIGS 薄膜及电池器件的影响

2017年第3卷第4期

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《工程（英文）》 >> 2017年第3卷第4期 doi: 10.1016/J.ENG.2017.04.020

碱金属掺杂对CIGS 薄膜及电池器件的影响

^a Tianjin Key Laboratory of Thin Film Devices and Technology, College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300071, China
^b Engineering Research Center of Nano-Structured Thin Film Solar Cell, Beijing 102211, China
^c Mads Clausen Institute, University of Southern Denmark, Sønderborg 6400, Denmark

录用日期： 2017-06-21 发布日期： 2017-08-30

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摘要

本文总结了Cu(In, Ga)Se₂ (CIGS) 电池中掺杂碱金属的发展历史和一些重要成果，综述了碱金属掺杂方式对CIGS 吸收层及器件性能的影响。通过分析由(NaF+KF)-PDT 导致的CIGS 表面结构及电学性能的改变，我们提出并解释了如下几个问题：①在低温沉积CIGS 薄膜过程中，Na 促进了CuInSe₂的优先形成，排挤Ga 向Mo 衬底扩散，造成CIGS 薄膜的分层现象；② Na 原子钝化CIGS 晶界及表面缺陷从而提高空穴载流子浓度的相关机制；③过渡层减薄提高了短路电流（J_SC）而不产生开路电压（V_OC）损失，这不仅归因于化学浴沉积初期过渡层较好的包覆性，还在于受主缺陷 $V Cu −$ 转型为施主缺陷 $Cd Cu +$ 时密度的增加，强化了同质浅埋结；④ (NaF+KF)-PDT 使CIGS 吸收层表面价带降低，进一步抑制了CIGS 吸收层和过渡层界面的复合，是提高电池开路电压与填充因子的重要原因。

关键词

碱金属 ; Cu(In ; Ga)Se₂ ; 薄膜太阳能电池 ; PDT

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参考文献

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