Insight into band alignment of Zn(O,S)/CZTSe solar cell by simulation

doi:10.1088/1674-1056/28/4/048801

Abstract

Cd-free kesterite structured solar cells are currently attracting attention because they are environmentally friendly. It is reported that Zn(O,S) can be used as a buffer layer in these solar cells. However, the band alignment is not clear and the carrier concentration of Zn(O,S) layer is low. In this study, the band alignment of the Zn(O,S)/Cu₂ZnSnSe₄ p-n junction solar cell and the effect of In₂S₃/Zn(O,S) double buffer layer are studied by numerically simulation with wxAMPS software. By optimizing the band gap structure between Zn(O,S) buffer layer and Cu₂ZnSnSe₄ absorber layer and enhancing the carrier concentration of Zn(O,S) layer, the device efficiency can be improved greatly. The value of CBO is in a range of 0 eV-0.4 eV for S/(S+O)=0.6-0.8 in Zn(O,S). The In₂S₃ is mainly used to increase the carrier concentration when it is used as a buffer layer together with Zn(O,S).

Keywords: CZTSe band alignment double buffer layer simulation

Received: 06 January 2019
Revised: 31 January 2019
Accepted manuscript online:

PACS:	88.40.H-	(Solar cells (photovoltaics))
	88.30.gg	(Design and simulation)
	88.40.hj	(Efficiency and performance of solar cells)
	88.40.jn	(Thin film Cu-based I-III-VI2 solar cells)

Fund:

Project supported by the National Natural Science Foundation of China (Grant Nos. 51572132, 61674082, and 61774089), the National Key Research and Development Program of China (Grant No. 2018YFB1500202), the Tianjin Natural Science Foundation of Key Project of China (Grant Nos. 16JCZDJC30700 and 18JCZDJC31200), and the 111 Project, China (Grant No. B16027).

Corresponding Authors: Yi Zhang
E-mail: yizhang@nankai.edu.cn

Cite this article:

Zhen-Wu Jiang(姜振武), Shou-Shuai Gao(高守帅), Si-Yu Wang(王思宇), Dong-Xiao Wang(王东潇), Peng Gao(高鹏), Qiang Sun(孙强), Zhi-Qiang Zhou(周志强), Wei Liu(刘玮), Yun Sun(孙云), Yi Zhang(张毅) Insight into band alignment of Zn(O,S)/CZTSe solar cell by simulation 2019 Chin. Phys. B 28 048801

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Insight into band alignment of Zn(O,S)/CZTSe solar cell by simulation

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