Microscopic mechanism for light-induced degradation of silicon solar cell in water vapor environment

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	Microscopic mechanism for light-induced degradation of silicon solar cell in water vapor environment
	Yang, JR; Fang, HP; Gao, Y
刊名	NANO ENERGY
	2016
卷号	30 页码:614-620
关键词	Silicon cluster Water Vapor Oxidation Degradation
ISSN号	2211-2855
通讯作者	Fang, HP ; Gao, Y (reprint author), Chinese Acad Sci, Shanghai Inst Appl Phys, Div Interfacial Water, Shanghai 201800, Peoples R China. ; Fang, HP ; Gao, Y (reprint author), Chinese Acad Sci, Shanghai Inst Appl Phys, Key Lab Interfacial Phys & Technol, Shanghai 201800, Peoples R China.
英文摘要	Degradation is the key factor to determine the efficiency and stability of the silicon solar cells, which highly affects their cost and practical performance. Humidity has been well recognized to accelerate the degradation process of the silicon solar cells, but the microscopic mechanism of light-induced degradation in hydrogenated silicon devices at water vapor environment is still elusive. In this paper, combining time-dependent density functional theory with ab initio molecular dynamics (AIMD), we show the water cluster adsorption slightly more elongates the Si-Si bond under illumination compared to the vacuum, which induces electron localization to further greatly facilitate the oxygen molecule absorption and dissociation. This external degradation process is different from the intrinsic degradation mechanisms in hydrogenated silicon devices under light irradiation caused by formation of metastable hydrogen complexes. The transition-state calculations of degradation pathway show the oxidation reaction energy barrier of Si cluster in water vapor environment is lower than that in vacuum, which confirms AIMD observations. Our results not only shed new insight for understanding the microscopic mechanism of light-induced degradation under water vapor, but would also be beneficial for controlling the light-induced silicon degradation of solar cell in real application.
收录类别	SCI
语种	英语
WOS记录号	WOS:000390636100071
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/26573]
专题	上海应用物理研究所_中科院上海应用物理研究所2011-2017年
推荐引用方式 GB/T 7714	Yang, JR,Fang, HP,Gao, Y. Microscopic mechanism for light-induced degradation of silicon solar cell in water vapor environment[J]. NANO ENERGY,2016,30:614-620.
APA	Yang, JR,Fang, HP,&Gao, Y.(2016).Microscopic mechanism for light-induced degradation of silicon solar cell in water vapor environment.NANO ENERGY,30,614-620.
MLA	Yang, JR,et al."Microscopic mechanism for light-induced degradation of silicon solar cell in water vapor environment".NANO ENERGY 30(2016):614-620.