期刊
APL MATERIALS
卷 4, 期 9, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4955028
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资金
- EPSRC [EP/K016288/1, EP/M009580/1, EP/M009602/1, EP/L000202]
- Royal Society
- European Research Council [277757]
- Engineering and Physical Sciences Research Council [EP/M009602/1, EP/K016288/1, 1413788, EP/M009580/1] Funding Source: researchfish
- EPSRC [EP/K016288/1, EP/M009602/1, EP/M009580/1] Funding Source: UKRI
The hybrid perovskite CH3NH3PbI3 (MAPI) exhibits long minority-carrier life-times 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. (C) 2016 Author(s).
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