Trapping and De-trapping dynamic in perovskite solar cells based on Pump-Push-Photocurrent study

Nowadays, perovskite Photovoltaic Solar Cells (PSCs) have attracted scientists’ attention due to the high- power conversion efficiency (PCE) and potentially low cost of manufacturing. However, the charge trapping and associated recombination processes negatively affect perovskite device performance. Here, we are using a new optical Pump-Push-Photocurrent (PPP) technique to study the carrier dynamic in perovskite devices. Particularly we are interested in the kinetics of charge trapping and nonradiative recombination in the device active layer. We have performed quasi-steady-state measurements of device performance under simultaneous illumination by visible and NIR laser diode. The preliminary results show that the effect of NIR push light scales linearly with NIR light intensity but depends in a more complex way from the intensity of visible light. By measuring the induced photocurrent as a function of light-modulation frequency we have performed an estimation of carrier lifetime. Moreover, the temperature-dependent current density measurements show that the effect of NIR light on the device performance does not originate from the sample heating but likely leads to the carrier detrapping.