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Thermal and environmental stability of metal halide perovskite solar cells remains a major barrier to their commercialization. The industry standard transparent electrode, ITO, has good(More)
We report on reversible, light-induced transformations in (CH3NH3)Pb(Br x I1-x )3. Photoluminescence (PL) spectra of these perovskites develop a new, red-shifted peak at 1.68 eV that grows in(More)