Impact of Interfaces and Laser Repetition Rate on Photocarrier Dynamics in Lead Halide Perovskites.

We studied charge carrier recombination in methylammonium lead iodide (MAPbI) perovskite and the impact of interfaces on the charge carrier lifetime using time-resolved photoluminescence. Pristine films and those covered with organic electron and hole transport materials (ETM and HTM) were investigated at various laser repetition rates ranging from 10 kHz to 10 MHz in order to separate the bulk and interface-affected recombination. We revealed two different components in the PL decay.

Improved charge carrier lifetime in planar perovskite solar cells by bromine doping.

The charge carrier lifetime is an important parameter in solar cells as it defines, together with the mobility, the diffusion length of the charge carriers, thus directly determining the optimal active layer thickness of a device. Herein, we report on charge carrier lifetime values in bromine doped planar methylammonium lead iodide (MAPbI) solar cells determined by transient photovoltage. The corresponding charge carrier density has been derived from charge carrier extraction.