Effect of sub-bandgap defects on radiative and non-radiative open-circuit voltage losses in perovskite solar cells.

ABSTRACT: The efficiency of perovskite solar cells is affected by open-circuit voltage losses due to radiative and non-radiative charge recombination. When estimated using sensitive photocurrent measurements that cover the above- and sub-bandgap regions, the radiative open-circuit voltage is often unphysically low. Here we report sensitive photocurrent and electroluminescence spectroscopy to probe radiative recombination at sub-bandgap defects in wide-bandgap mixed-halide lead perovskite solar cells. The radiative ideality factor associated with the optical transitions increases from 1, above and near the bandgap edge, to ~2 at mid-bandgap. Such photon energy-dependent ideality factor corresponds to a many-diode model. The radiative open-circuit voltage limit derived from this many-diode model enabl

SUBMITTER: Aalbers GJW 

PROVIDER: S-EPMC10858920 | biostudies-literature | 2024 Feb

REPOSITORIES: biostudies-literature