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Carrier transport and surface potential over phase variations in the surface and bulk of highly efficient Cu 2 ZnSn(S,Se) 4 solar cells
Author(s) -
Kim Juran,
Kim Jayeong,
Ko Eunji,
Yoon Seokhyun,
Sim JunHyoung,
Yang KeeJeong,
Kim DaeHwan,
Kang JinKyu,
Song Yu Jin,
Jeon ChanWook,
Jo William
Publication year - 2020
Publication title -
progress in photovoltaics: research and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.286
H-Index - 131
eISSN - 1099-159X
pISSN - 1062-7995
DOI - 10.1002/pip.3248
Subject(s) - kesterite , czts , materials science , solar cell , energy conversion efficiency , raman spectroscopy , raman scattering , carrier lifetime , optoelectronics , nanotechnology , optics , silicon , physics
We report highly efficient Cu 2 ZnSn(S,Se) 4 (CZTSSe) thin films with a power conversion efficiency (PCE) of 12.3% at their surface and interface. The structural and electrical properties were locally investigated, using scanning probe microscopy and micro‐Raman scattering, to improve the performance of kesterite solar cells. Interestingly, this research reports quite different results from the conventional kesterite solar cells, owing to the observance of undesirable voids and secondary phases. Nonetheless, the solar cells exhibit a high PCE of over 12%. Thus, we probe the kesterite solar cells as a function of the depth and introduce a mechanical dimple‐etching process. The relatively low melting temperature of the pure‐metal precursors results in the unique properties within the solar cell materials. Understanding these phenomena and their effects on carrier behavior enables the achievement of a higher PCE and better performance for kesterite solar cells.