Date

Place

[P2-138]
14:00 ~ 15:30
Title:Effects of Compositional Distribution on Secondary Phase and Defect in CZTS Thin-Film Solar Cell
Kee-Jeong Yang and Jun-Hyoung Sim (DGIST, Korea)
Abstract: Although Cu2ZnSnS4 (CZTS) has attracted attention as an alternative absorber material to replace CuInGaSe2 (CIGS) in solar cells, the current level of understanding of its characteristic loss mechanisms is not sufficient for achieving high power conversion efficiency. In this study, we examined the correlations between the compositional ratio distribution within the CZTS absorber layer, which depends on the temperature of the sulfurization process, and the subsequent defect and surface electrical characteristics. As the sulfurization process temperature increases, the crystallinity of the absorber layer improves, and the compositional ratio distribution exhibits a more uniform Cu-poor/Zn-rich composition. Additionally, the degradation of the back-contact barrier characteristics can be controlled by suppressing the ZnS secondary phase formation at the CZTS/MoS2 interface. Furthermore, this improvement suppresses the formation of deep-level defects, thereby enabling the current and voltage losses to be minimized. This result was verified by analyzing the surface electrical characteristics. We anticipate that the PCE of a CZTS solar cell with a highly uniform compositional ratio distribution can be further increased.
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