铜铟镓硒(CIGS)薄膜太阳电池的碱金属掺杂工程  

Alkali Metal Doping Engineering for Copper Indium Gallium Selenium(CIGS)Thin Film Solar Cells

作　　者：陈小青 杨少鸿 曲晶晶 张永哲[1] 严辉[1] CHEN Xiaoqing;YANG Shaohong;QU Jingjing;ZHANG Yongzhe;YAN Hui(College of Materials Science and Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学材料科学与工程学院,北京100124

出　　处：《北京工业大学学报》2020年第10期1180-1191,共12页Journal of Beijing University of Technology

基　　金：国家自然科学基金资助项目(61974008);北京市教育委员会科技计划资助项目(KM202010005005)。

摘　　要：铜铟镓硒(CIGS)太阳电池不仅具有高吸收系数和高光电能量转换效率,而且表现出良好的稳定性和低廉的生产成本,依然是目前普遍关注的发展对象.自20世纪90年代,研究人员发现碱金属掺杂可以明显提升CIGS电池的性能,并在碱金属掺杂研究方面取得一系列突破性进展.结合本课题组的研究进展,主要介绍了其中针对碱金属掺杂引发的一些主要技术突破.同时简单介绍了碱金属掺杂的3种方法:前掺法、中掺法和后掺法,其中使用后掺法制备出的CIGS电池能够获得较高的能量转换效率.碱金属掺杂的作用机制,主要是调节CIGS吸收层的带隙和钝化薄膜中的缺陷,提高薄膜中的空穴密度,抑制吸收层内部和界面的载流子复合,最终提升太阳电池的开路电压和填充因子.同时,碱金属会影响吸收层的元素分布和微观形貌,这一方面对太阳能电池性能的影响仍存在争议.Copper indium gallium selenium(CIGS)solar cells have attracted intense interest because of their high light absorption coefficient,high photoelectric energy conversion efficiency,good stability and low production costs.Researchers have discovered that alkali metal doping engineering can significantly improve the performance of CIGS solar cells since the 1990s,and a lot of research on alkali metal doping has led to a series of breakthroughs.Based on the results of the research group,the major technological breakthroughs caused by alkali metal doping engineering were introduced in this paper.Three methods of alkali metal doping including the front doping,the middle doping and the post doping methods were presented briefly.Among them,the CIGS solar cells prepared by the post doping method showed highest conversion efficiency.The roles of alkali metal doping were adjusting the band gap of the CIGS absorption layer,passivating the defects,increasing the hole density,and suppressing the carrier recombination in the CIGS bulk and at the interface.These functions finally increased the open circuit voltage and fill factor of the solar cell.Alkali metals also affected the element distribution and micro-morphology of the absorption layer,although its effect on the device performance remained controversial.

关 键 词：铜铟镓硒(CIGS) 太阳电池 碱金属掺杂 形貌 生长动力学 缺陷 

分 类 号：U461[机械工程—车辆工程] TP308[交通运输工程—载运工具运用工程]