Unusual bandgap renormalization in 2D inorganic lead-halide perovskite nanoplatelets

Owing to high quantum yields, large absorption cross-section, excellent carrier transport performance and narrow-band emission, inorganic lead-halide perovskite semiconductors have received increasing attention for their applications in solar cells, LEDs, laser devices, etc. Understanding the physical origin of temperature dependence of bandgap in inorganic lead-halide perovskites is essential and important.