Research Update: Relativistic origin of slow electron-hole recombination in hybrid halide perovskite solar cells

Pooya Azarhoosh, Scott McKechnie, Jarvist M. Frost, Aron Walsh, Mark Van Schilfgaarde

Research output: Contribution to journalArticle

112 Citations (Scopus)

Abstract

The hybrid perovskite CH3NH3PbI3 (MAPI) exhibits long minority-carrier lifetimes and diffusion lengths. We show that slow recombination originates from a spin-split indirect-gap. Large internal electric fields act on spin-orbit-coupled band extrema, shifting band-edges to inequivalent wavevectors, making the fundamental gap indirect. From a description of photoluminescence within the quasiparticle self-consistent GW approximation for MAPI, CdTe, and GaAs, we predict carrier lifetime as a function of light intensity and temperature. At operating conditions we find radiative recombination in MAPI is reduced by a factor of more than 350 compared to direct gap behavior. The indirect gap is retained with dynamic disorder.

Original languageEnglish
Article number091501
JournalAPL Materials
Volume4
Issue number9
DOIs
Publication statusPublished - 2016 Sep 1

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)

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