Journal
MATERIALS
Volume 15, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/ma15103419
Keywords
Cu2ZnSn(S; Se)(4); thin-film solar cells; graphene oxide; intermediate layer; back contact
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Funding
- GIST Young Scientist Research Project grant - GIST in 2022
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The insertion of an intermediate layer between the CZTSSe absorber film and the Mo back contact in Cu2ZnSn(S,Se)(4) (CZTSSe) solar cells has been demonstrated to enhance conversion efficiency. Among the candidates for this intermediate layer, chemically reduced graphene oxide (GO) showed excellent properties, such as high-charge mobility and low processing cost.
Cu2ZnSn(S,Se)(4) (CZTSSe) solar cells with low cost and eco-friendly characteristics are attractive as future sources of electricity generation, but low conversion efficiency remains an issue. To improve conversion efficiency, a method of inserting intermediate layers between the CZTSSe absorber film and the Mo back contact is used to suppress the formation of MoSe2 and decomposition of CZTSSe. Among the candidates for the intermediate layer, graphene oxide (GO) and reduced GO have excellent properties, including high-charge mobility and low processing cost. Depending on the type of GO, the solar cell parameters, such as fill factor (FF), were enhanced. Thus, the conversion efficiency of 6.3% was achieved using the chemically reduced GO intermediate layer with significantly improved FF.
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