Abstract
We focused on Bi3+ as a promising candidate for donor impurity in lead halide perovskites and fabricated electron-doped CH3NH3PbBr3 single crystals. Room-temperature optical measurement revealed the increase in Urbach tail and suppression of photon recycling effect by Bi doping, which results in photoluminescence (PL) blue shift. Furthermore, we conducted optical reflectance and PL measurements at cryogenic temperature, where the thermal broadening is supressed. At low temperature, exciton dominates the optical properties and the photon recycling effect is negligible. From the PL intensity and spectral width, we quantitatively evaluated the impact of Bi-doping on crystal inhomogeneity.
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