Oxygen Management to Avoid Photo-Inactive Cd(S,Se) for Efficient Cd(Se,Te) Solar Cells

Deng-Bing Li, Sabin Neupane, Sandip Bista, Chuanxiao Xiao, Abasi Abudulimu, Manoj Jamarkattel, Adam Phillips, Michael Heben, Jonathan Poplawsky, David Cullen, Chun-Sheng Jiang, Randall Ellingson, Yanfa Yan

Research output: Contribution to journalArticlepeer-review

6 Scopus Citations

Abstract

Our previous work has demonstrated that the formation of a penternary cadmium chalcogenide Cd(O,S,Se,Te) region can significantly reduce the front interface recombination in Cd(Se,Te)-based thin-film solar cells. In this work, we have shown that oxygen management during the device fabrication is crucial to form this region. While both the CdS and CdSe layer depositions and the postdeposition CdCl2 treatment should be conducted in the presence of oxygen, the CdTe deposition should be conducted in an oxygen-free atmosphere. Improper oxygen management leads to low device performance due to the formation of a photoinactive Cd(S,Se) region and reduced absorber quality. Additionally, we investigated the carrier transport and collection properties in devices with photoinactive Cd(S,Se) and photoactive Cd(O,S,Se,Te) at the front interface to gain comprehensive understanding of the mechanisms that resulted in improved efficiencies approaching 20%.

Original languageAmerican English
Pages (from-to)1529-1534
Number of pages6
JournalACS Energy Letters
Volume8
Issue number3
DOIs
StatePublished - 2023

Bibliographical note

Publisher Copyright:
© 2023 American Chemical Society.

NREL Publication Number

  • NREL/JA-5K00-85613

Keywords

  • CdTe deposition
  • device fabrication
  • oxygen management
  • thin-film solar cells

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