Project R-12169

"Stable Wide bAndgap Perovskites for Tandem Solar cells" (SWAPTS) (Research)

Perovskite solar cells (PVK SC) have emerged in the last decade as a particularly promising high-performance photovoltaic technology owing to their unique opto-electronic properties. Despite impressive advancements at the performance level (25.5% single junction SC; 29.1% Si/PVK tandem SC), operational stability remains a significant hurdle impeding the technology's commercial development. Particularly, the lack of stable wide bandgap PVK with high open circuit voltages (Voc) is limiting further progress. The main cause at hand is the so-called "Hoke-effect", which is the light-induced halide segregation in the ABX3 polycrystalline absorber upon increasing Br/I ratios at the X-site upon tuning the bandgap to an optimal range for tandem applications. This results in high voltage deficits under operation conditions in corresponding devices. The ambition of the current project is therefore to develop a (i) stable and (ii) highly efficient (iii) wide bandgap PVK through only A- and B-site substitution.

01 November 2021 - 31 October 2024