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在谷物边界调节带对齐,以提高 Cu₂ZnSnS₄太阳能电池的效率

Wenjie Li¹, Weimin Li¹, Guo Chen¹

¹Shenzhen Institute of Advanced Technology, Chinese Academy of Science, Shenzhen 518055, China.

|August 14, 2023

概括

在铜硫化 (CZTS) 太阳能电池中,通过氧化炼的工程带对齐显著减少了载体重组. 这种频段工程方法在CZTS薄膜设备中提高了功率转换效率 (PCE) 30%.

科学领域:

材料科学材料科学材料科学
可再生能源可再生能源是可再生能源.
固态物理固态物理

背景情况:

与铜硫化 (CIGS) 电池相比,铜硫化 (CZTS) 太阳能电池的功率转换效率 (PCE) 较低.
这种效率差距部分是由于在谷物边界 (GB) 和谷物内部 (GI) 的带对齐不同.
CZTS在GBs显示了I型带对齐,导致载体捕获和重组,从而减少了PCE.

研究的目的:

与CIGS太阳能电池相比,了解CZTS较低PCE背后的机制.
调查 CZTS 太阳能电池中 GB 和 GI 频段对齐的作用.
通过频段工程来增强CZTS太阳能电池的PCE.

主要方法:

进行原子力显微镜 (AFM) 用于基本理解.
在CZTS的带工程中使用了氧化化.
在GBs和GI进行了带对齐的表征.

主要成果:

在GBs时,CZTS表现出I型带对齐,导致电子和孔陷并增加重组.
氧化化改变了带对齐到反向的I型,有效地阻止了GBs的载体重组.
通过这种频段工程方法实现了30%的PCE提升.

结论:

GBs和GI之间的带对齐极大地影响了多晶薄膜太阳能电池中的PCE.
带对齐工程是改善太阳能电池性能的一种可行的策略.
进行AFM是一种有价值的工具,用于在多晶片中表征带线对齐.

关键词:

这就是CZTS.导探探头原子力显微镜原子力显微镜谷物界限谷物界限谷物界限谷物内部的谷物内部的谷物太阳能电池是太阳能电池中的一个.

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