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Circular Photogalvanic Effect in Organometal Halide Perovskite CH3NH3PbI3



Junwen Li, Paul M. Haney


We study the circular photogalvanic effect in the organometal halide perovskite solar cell absorber CH$_3$NH$_3$PbI$_3$. The calculated photocurrent density is about $10^{-9}$ A/W, comparable to the previously studied quantum well and bulk Rashba systems. Because of the dependence of circular photogalvanic effect on inversion symmetry breaking, we can study the inversion asymmetry at different depths away from the surface by tuning the penetration depth and therefore, the relative photocurrent contribution from surface and bulk regions. We propose that measurements of this effect may clarify the presence or absence of inversion symmetry, which remains a controversial issue and has been argued to play an important role in the high conversion efficiency of this material.
Applied Physics Letters


Organometal Halide Perovskite, Rashba, Inversion Symmetry Breaking, Circular Photogalvanic Effect
Created November 7, 2016, Updated November 10, 2018