Transition metal-substituted lead halide perovskite absorbers

M. D. Sampson, J. S. Park, Richard D Schaller, M. K.Y. Chan, A. B.F. Martinson

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Lead halide perovskites have proven to be a versatile class of visible light absorbers that allow rapid access to the long minority carrier lifetimes and diffusion lengths desirable for traditional single-junction photovoltaics. We explore the extent to which the attractive features of these semiconductors may be extended to include an intermediate density of states for future application in multi-level solar energy conversion systems capable of exceeding the Shockley-Queisser limit. We computationally and experimentally explore the substitution of transition metals on the Pb site of MAPbX3 (MA = methylammonium, X = Br or Cl) to achieve a tunable density of states within the parent gap. Computational screening identified both Fe- and Co-substituted MAPbBr3 as promising absorbers with a mid-gap density of states, and the later films were synthesized via conventional solution-based processing techniques. First-principles density functional theory (DFT) calculations support the existence of mid-gap states upon Co incorporation and enhanced sub-gap absorption, which are consistent with UV-visible-NIR absorption spectroscopy. Strikingly, steady state and time-resolved PL studies reveal no sign of self-quenching for Co-substitution up to 25%, which suggest this class of materials to be a worthy candidate for future application in intermediate band photovoltaics.

Original languageEnglish
Pages (from-to)3578-3588
Number of pages11
JournalJournal of Materials Chemistry A
Volume5
Issue number7
DOIs
Publication statusPublished - 2017

    Fingerprint

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Cite this

Sampson, M. D., Park, J. S., Schaller, R. D., Chan, M. K. Y., & Martinson, A. B. F. (2017). Transition metal-substituted lead halide perovskite absorbers. Journal of Materials Chemistry A, 5(7), 3578-3588. https://doi.org/10.1039/C6TA09745F