Optically induced charge exchange in composite structures based on ZnO with embedded CsPbBr$_{3}$ nanocrystals

The introduction of CsPbBr$_{3}$ nanocrystals into the ZnO porous matrix leads to the appearance of a positive photoconductivity response in the visible spectral range. Measurement of the spectral dependences of absorption, photoluminescence and photoconductivity showed that the shape and position of the photoluminescence peak are associated with defects in CsPbBr$_{3}$. Analysis of the kinetics of photoconductivity relaxation shows the possibility of accelerating the process of recombination of photoexcited charge carriers by more than an order of magnitude. The mechanisms responsible for the effect are discussed.