We have investigated the photoluminescence (PL) and photoconductivity of lead halide perovskite (CH₃NH₃PbBr₃) films modified with different mixed cellulose esters (CEs). It was shown that the absorbance and PL spectra of CH₃NH₃PbBr₃ : CE films contain contributions of both the CH₃NH₃PbBr₃ and CE with the dominant contribution to the PL from perovskite component. The dependences of the integral PL intensities of the CH₃NH₃PbBr₃ : CE films on the optical excitation power turned out to be sublinear. This indicates that exciton recombination, as well as recombination via impurity levels, occur in CH₃NH₃PbBr₃ : CE films at high excitation power levels. The conductivity of CH₃NH₃PbBr₃ : CE films at 300 K increases up to ~90 times when illuminated by a solar simulator, and this effect is environmentally stable due to the formation of hydrogen bonds between CE and the lead halide perovskite CH₃NH₃PbBr₃. It is expected that appropriate selection of CE and optimization of CE inclusion will improve the optoelectronic properties and stability of composite films based on lead halide perovskite-CE composites. Keywords: mixed cellulose esters, lead halide perovskites, photoluminescence, conductivity.

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Дата начала обработки статистических данных - 27 января 2016 г.