RT Journal Article
T1 llumination Intensity Dependence of the Recombination Mechanism in Mixed Perovskite Solar Cells
A1 Castro-Chong, Alejandra
A1 Riquelme Expósito, Antonio Jesús
A1 Aernouts, Tom
A1 Bennett, Laurence J.
A1 Richardson, Giles
A1 Oskam, Gerko
A1 Anta, Juan
K1 Perovskite solar cells
K1 Impedance spectroscopy
AB Recombination mechanisms in solar cells are frequently assessed through the determination of ideality factors. In this work we report an abrupt change of the value of the "apparent" ideality factor (nAP) in high-efficiency FA0.71MA0.29PbI2.9Br0.1 based mesoscopic perovskite solar cells as a function of light intensity. This change is manifested as a transition from a regime characterized by nAP~1.8¿2.5 at low light intensities (<10¿mWcm-2) to one characterized by nAP~1. This transition is equally observed in the recombination resistance extracted from open-circuit impedance measurements. We use drift-diffusion simulations with explicit consideration of ion migration to determine the origin of this transition. We find that a change ofrecombination mechanism concurrent with a modification of the concentration of ionic vacancies is the most likely explanation of the observed behaviour. In the drift-diffusion simulations we show that the apparent ideality factor is in fact affected by the ion vacancy concentration so it is not the optimal parameter to assess the dominant recombination mechanism. We argue that a procedure based on a recently derived ¿electronic¿ ideality factor obtained from the high frequency feature of the impedance spectrum is better suited to determine the recombination route that dictates the photovoltage.
PB Wiley
SN 2192-6506
YR 2021
FD 2021
LK http://hdl.handle.net/10433/11650
UL http://hdl.handle.net/10433/11650
LA en
NO ChemPlusChem 2021, 86, 1347-1356
NO Universidad Pablo de Olavide / University of Southampton
DS RIO
RD Apr 23, 2026