Influence of crystallization temperature on the optical properties of MAPbBr3 single crystals

Abstract

Optical properties of methylammonium lead bromide (MAPbBr3) perovskite single crystals grown using a seed-induced inverse temperature crystallization method were studied using photoluminescence (PL) and time-resolved PL measurements. Crystallization rate was observed to be faster with an increasing crystallization temperature. The highest crystal quality was recorded for a sample crystallized at 85 °C, and it exhibited the strongest X-ray diffraction peaks and PL intensity. The PL spectra for all samples crystallized at room temperature showed an asymmetric shape with a shoulder in the low energy side; this can be attributed to a photon recycling effect caused by re-emission inside the single crystal. We confirmed that the structural and optical properties of MAPbBr3 single crystals can be manipulated by modifying the crystallization temperature.