Solar conversion efficiency and distribution of ZnS secondary phase in Cu2ZnSnS4 solar cells

Dahyun Nam, Soyeon Cho, Jun Hyoung Sim, Kee Jeong Yang, Dae Ho Son, Dae Hwan Kim, Jin Kyu Kang, Min Su Kwon, Chan Wook Jeon, Hyeonsik Cheong

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

Abstract

We found a clear correlation between the solar conversion efficiency and the distribution of the ZnS secondary phase in Cu2ZnSnS4 (CZTS) solar cells. Five CZTS solar cells were prepared by the two-step process in which sputtered precursor multilayers were sulfurized at different temperatures. In higher efficiency solar cells, the ZnS secondary phase was found to accumulate near the interface between CZTS and MoS2 formed on top of the Mo layer. It was also found that a solar cell with a higher efficiency showed weaker ZnS Raman signal in the MoS2 layer. The highest conversion efficiency of 7.5% was obtained from a solar cell prepared at a sulfurization temperature of 570 °C, in which no ZnS was detected in the MoS2 layer. We suggest that in order to obtain a high efficiency CZTS solar cell, it is critical to find a condition that keeps ZnS from the MoS2 layer.

Original languageEnglish
Pages (from-to)226-231
Number of pages6
JournalSolar Energy Materials and Solar Cells
Volume149
DOIs
StatePublished - May 2016

Bibliographical note

Publisher Copyright:
© 2016 Elsevier B.V. All rights reserved.

Keywords

  • Copper-zinc-tin sulfide
  • MoS
  • Raman spectroscopy
  • Secondary phase
  • Thin films
  • ZnS

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