Enhancing photoluminescence yields in lead halide perovskites by photon recycling and light out-coupling.

ABSTRACT: In lead halide perovskite solar cells, there is at least one recycling event of electron-hole pair to photon to electron-hole pair at open circuit under solar illumination. This can lead to a significant reduction in the external photoluminescence yield from the internal yield. Here we show that, for an internal yield of 70%, we measure external yields as low as 15% in planar films, where light out-coupling is inefficient, but observe values as high as 57% in films on textured substrates that enhance out-coupling. We analyse in detail how externally measured rate constants and photoluminescence efficiencies relate to internal recombination processes under photon recycling. For this, we study the photo-excited carrier dynamics and use a rate equation to relate radiative and non-radiative re

SUBMITTER: Richter JM 

PROVIDER: S-EPMC5196482 | biostudies-literature | 2016 Dec

REPOSITORIES: biostudies-literature