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arXiv · 1604.04500

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

Pooya Azarhoosh·Jarvist M. Frost·Scott McKechnie·Aron Walsh·Mark van Schilfgaarde
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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 (QSGW) 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.

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Pooya Azarhoosh, Jarvist M. Frost, Scott McKechnie, Aron Walsh, Mark van Schilfgaarde. 2016-06-02. Relativistic origin of slow electron-hole recombination in hybrid halide perovskite solar cells. https://doi.org/10.1063/1.4955028

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