Optimization of Selenization Condition for Efficiency CIGSe Solar Cells Based on Postselenization of CuInGa Precursors

Hanpeng Wang; Daming Zhuang; Ming Zhao; Hao Tong; Mengyao Jia; Junsu Han; Zhihao Wu; Qianming Gong

doi:10.1021/acsami.4c08578

Optimization of Selenization Condition for Efficiency CIGSe Solar Cells Based on Postselenization of CuInGa Precursors

ACS Appl Mater Interfaces. 2024 Oct 12. doi: 10.1021/acsami.4c08578. Online ahead of print.

Authors

Hanpeng Wang¹, Daming Zhuang^{1

2}, Ming Zhao^{1

2}, Hao Tong³, Mengyao Jia¹, Junsu Han¹, Zhihao Wu¹, Qianming Gong^{1

2}

Affiliations

¹ School of Materials Science and Engineering, Tsinghua University, 100084 Beijing, P. R. China.
² Key Laboratory for Advanced Materials Processing Technology of Ministry of Education, State Key Lab. of New Ceramics and Fine Processing, Tsinghua University, 100084 Beijing, P. R. China.
³ School of Energy and Power Engineering, North University of China, 03005 Taiyuan, P. R. China.

PMID: 39394984
DOI: 10.1021/acsami.4c08578

Abstract

The degree of selenization of the CIGSe absorbers is controlled by regulating the parameters of the selenization reaction. The structure, element distribution, phase composition of the CIGSe absorbers, and the performances of the solar cells with different selenization degrees are studied. Insufficient selenization will lead to residual Cu₂Se phase on the surface and insufficient Na diffusion, which will affect the V_Cu⁺ on the surface and the recombination at the front interface. However, excessive selenization will make the MoSe₂ layer thicken at the back interface of the CIGSe/Mo, resulting in the increase of the series resistance and the enhancement of the recombination at the back interface. The appropriate selenization degree is conducive to inhibiting the recombination at the front and back interfaces. Improved device performances can be obtained by optimizing the selenization degree of the absorbers.

Keywords: CIGSe solar cell; MoSe2; Na diffusion; interface recombination; selenization.