Carrier transport and surface potential over phase variations in the surface and bulk of highly efficient Cu2ZnSn(S,Se)4 solar cells

Juran Kim, Jayeong Kim, Eunji Ko, Seokhyun Yoon, Jun Hyoung Sim, Kee Jeong Yang, Dae Hwan Kim, Jin Kyu Kang, Yu Jin Song, Chan Wook Jeon, William Jo

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

We report highly efficient Cu2ZnSn(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.

Original languageEnglish
Pages (from-to)382-392
Number of pages11
JournalProgress in Photovoltaics: Research and Applications
Volume28
Issue number5
DOIs
StatePublished - 1 May 2020

Bibliographical note

Publisher Copyright:
© 2020 John Wiley & Sons, Ltd.

Keywords

  • CuZnSn(S,Se) solar cells
  • Kelvin probe force microscopy
  • carrier transport
  • micro-Raman spectroscopy
  • nano-Auger electron spectroscopy

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