Carrier dynamics in a perovskite solar cell observed with light-triggered time domain reflectometry

Abstract The carrier dynamics of photogenerated holes in perovskite solar cells were observed using light-triggered time-domain reflectometry. The distribution of photogenerated holes in the perovskite layer began to expand immediately (within the time resolution) after light illumination. The hole frontline arrived at the perovskite/hole transport layer interface in 30 ns and at the hole transport layer/anode interface in 90 ns. Afterwards, the distribution of the photogenerated holes continued to grow and reached the steady photogeneration state in approximately 30 μs.