Enhanced efficiency in lead-free bismuth iodide with post treatment based on a hole-conductor-free perovskite solar cell

Jongmoon Shin, Maengsuk Kim, Sujeong Jung, Chang Su Kim, Jucheol Park, Aeran Song, Kwun Bum Chung, Sung Ho Jin, Jun Hee Lee, Myungkwan Song

Research output: Contribution to journalArticlepeer-review

74 Scopus citations

Abstract

Despite the excellent merits of lead perovskite solar cells, their instability and toxicity still present a bottleneck for practical applications. Bismuth perovskite has emerged as a candidate for photovoltaic (PV) applications, because it not only has a low toxicity but is also stable in air. However, the power conversion efficiency (PCE) remains an unsolved problem. We performed band gap tuning experiments to improve the efficiency. The absorption of ABi3I10 structure films was extended within the visible region, and the optical band gap was decreased considerably compared to that for Cs3Bi2I9. Furthermore, we explained the correlation between the structure and the optical properties via a first-principles study. A device employing CsBi3I10 as a photoactive layer exhibits a PCE of 1.51% and an excellent ambient stability over 30 days. [Figure not available: see fulltext.].

Original languageEnglish
Pages (from-to)6283-6293
Number of pages11
JournalNano Research
Volume11
Issue number12
DOIs
StatePublished - 1 Dec 2018

Keywords

  • band-gap engineering
  • bismuth halide
  • lead free
  • perovskite
  • solar cells

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