Templated Growth and Passivation of Vertically Oriented Antimony Selenide Thin Films for High-Efficiency Solar Cells in Substrate Configuration

Suman Rijal, Deng-Bing Li, Rasha Awni, Chuanxiao Xiao, Sandip Bista, Manoj Jamarkattel, Michael Heben, Chun-Sheng Jiang, Mowafak Al-Jassim, Zhaoning Song, Yanfa Yan

Research output: Contribution to journalArticlepeer-review

43 Scopus Citations

Abstract

Antimony selenide (Sb2Se3) is a promising low-cost photovoltaic material with a 1D crystal structure. The grain orientation and defect passivation play a critical role in determining the performance of polycrystalline Sb2Se3 thin-film solar cells. Here, a seed layer is introduced on a molybdenum (Mo) substrate to template the growth of a vertically oriented, columnar Sb2Se3 absorber layer by closed space sublimation. By controlling the grain orientation and compactness of the Sb2Se3 seeds, obtain high-quality Sb2Se3 absorber layers with passive Sb2Se3/Mo interfaces is obtained, which in turn improve the transport of photoexcited charge carriers through the absorber layer and its interfaces. Post-deposition annealing of absorber layers in ambient air is further utilized to passivate the defects in Sb2Se3 and enhance the quality of the front heterojunction. As a result of systematic processing optimization, Sb2Se3 planar heterojunction solar cells are fabricated in substrate configuration with a champion power conversion efficiency of 8.5%.

Original languageAmerican English
Article number2110032
Number of pages10
JournalAdvanced Functional Materials
Volume32
Issue number10
DOIs
StatePublished - 2022

Bibliographical note

Publisher Copyright:
© 2021 Wiley-VCH GmbH

NREL Publication Number

  • NREL/JA-5K00-81173

Keywords

  • activation energy
  • annealing
  • antimony selenide
  • passivation
  • seed layers
  • solar cells

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