Charge transport mechanism near crystal edge of layered halide perovskites*

Halide perovskites show superior optical and electrical properties, which make this group of materials promising for highly efficient optoelectronic applications. Researchers have reported that there existed below-bandgap energy states at the edges of the layered perovskites and the presence of these lower energy states resulted in highly improved solar cell efficiency. In our work, the photophysics investigation near crystal edge unveiled the local charge transport mechanism and energy flow in layered halide perovskites, which will provide vital guidance for designing and engineering highly efficient optoelectronics based on this group of materials.