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 journalArticlepeer-review

171 Citations (Scopus)
170 Downloads (Pure)

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
Number of pages8
JournalAPL Materials
Volume4
Issue number9
Early online date21 Jul 2016
DOIs
Publication statusPublished - Sept 2016

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