6533b830fe1ef96bd1297b28

RESEARCH PRODUCT

Radiative and non-radiative losses by voltage-dependent in-situ photoluminescence in perovskite solar cell current-voltage curves

subject

description

Abstract The rapid development of perovskite solar cells has been based on improvements in materials and device architectures, yet further progress towards their theoretical limit will require a detailed study of the main physical processes determining the photovoltaic performance. Luminescence can be a key parameter for this purpose, as it directly assesses radiative recombination. We present steady-state absolute photoluminescence of an operating device at varying voltages as a tool to study the loss mechanisms in perovskite devices. The calibration to absolute photon numbers gives access to the variation of the relative radiative/non-radiative recombination weighted along the measured potentials, and allows identifying charge extraction deficits not only at short-circuit conditions but at each point of the current-voltage curve, which we show on a vacuum-deposited solar cell. These measurements can be crucial to characterize the nature of the charge losses, a step to develop approaches to improve this photovoltaic technology.