Researchers compare the band edge carrier dynamics in hybrid organic–inorganic lead halide perovskites (HOIPs) single crystals, MAPbBr3, FAPbBr3, and its all-inorganic counterpart CsPbBr3, by time-resolved photoluminescence (TRPL) and transient reflectance (TRF) spectroscopy. The bulk sensitive TRPL measurement shows similarly low carrier-trapping rate constants and electron–hole radiative recombination rate constants in all three crystals, regardless of cation type. The researchers determine the surface recombination velocity and carrier mobility in the near surface region in MAPbBr3, FAPbBr3, and CsPbBr3 single crystals using the surface sensitive TRF measurement and again find similar results from all three crystals. These results suggest that the presence of organic cations is not a necessity and the remarkable properties of band edge carriers in lead halide perovskites are intrinsic to this class of materials.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering