Perovskite photovoltaics

Solar cells based on perovskite absorbers are the fastest growing photovoltaic technology in history.  Since their introduction in early 2008 with a starting point power conversion efficiency of ~4%, they have now since left behind amorphous Silicon and are already achieving efficiencies of over 22%, competing with other industry staples such as CIGS and polycrystalline Silicon. Perovskite solar cells have the potential to become a serious contender for the photovoltaic market due to their already demonstrated high device efficiencies, the low-cost of their starting materials and their compatibility with large-scale, solution processing techniques such as roll-to-roll printing on flexible substrates.

In our group, we have focused our research on the development of novel perovskite materials and deposition methods, with a high emphasis on the elucidation of the working principles behind the assembled photovoltaic devices. In particular we focus on the development of novel lead-free perovskites with high stability, and the recycling of lead containing perovskites solar cells. We develop synthetic protocols to prepare highly oriented 2D and 3D perovskite films and study their performance in devices. We also prepared low-cost hole transporting materials and performed in-depth studies on their charge transfer dynamics. As most of these perovskites are very water sensitive we study the stability of the material toward humidity to reveal the degradation process which leads to routes to improve the stability of the perovskite and devices. Additionally we also study the use of perovskite nanocrystals for lighting applications.