Numerical investigation of the effect of interface conditions in HTM-free and printable WOx based perovskite solar cells
Résumé
One of the remaining issues, impeding the commercialization of the low cost and high
efficiency perovskite solar cells (PSCs) is whether the halide perovskite materials have
sufficient stability. Two main instabilities are the light-induced degradation1
and the scandependent
performance, namely the hysteresis effect2
. Following the observation and the
atomic computation, the interfaces of perovskite/WOx and perovskite/Au are numerically
investigated by reproducing the experimental current-voltage (J-V) and capacitance-voltage (CV)
characteristics3
. As a result, the build in potential (Vbi) variation, open circuit voltage (VOC)
loss and hysteresis effects are explained. The effect of mobile ions is additionally taken into
account in the drift-diffusion model for the realistic modelling, including the ionic current, the
dopant-like behavior and the polarization effect between ions and the other charges. The
interaction between interface traps and mobile ions is assumed to lead the anomalous hysteresis.
Furthermore, a new approach is proposed to the modelling of Kelvin Probe Force Microscopy
(KPFM) of hetero-structures in dark and under illumination, aiming at estimating the surface
states on the top of electron transport materials and understanding the carrier operation inside
the cells.
| Origine | Fichiers produits par l'(les) auteur(s) |
|---|