Organic synthesis; Material Characterization; theoretical simulation; Perovskite solar cell; Device fabrication; Tandem Perovskite/Silicon solar cell
Sutanto Albertus A., Queloz Valentin I. E., Garcia-Benito Inés, Laasonen Kari, Smit Berend, Nazeeruddin Mohammad Khaja, Syzgantseva Olga A., Grancini Giulia (2019), Pushing the limit of Cs incorporation into FAPbBr 3 perovskite to enhance solar cells performances, in APL Materials
, 7(4), 041110-041110.
The world global installed photovoltaic capacity will likely reach well over 1000 GW by 2030 and could reach up to 5’000 GW by 2050. At this moment solar will likely one of the major electricity source worldwide, with the lowest costs, while contributing to mitigating CO2 emissions. Using novel materials with higher potential performance and less energy intensive processing technologies could contribute to this paradigm change. In that context, solar cell based on organo-metal trihalide perovskites are one of the most promising photovoltaic (PV) technologies due to their impressive increase in initial power conversion efficiency (PCE) to currently 22.1% [1-3] in just over 6 years. This high efficiency is due to various excellent properties exhibited by the mixed organo-metal trihalide perovskites such as panchromatic absorption with very high molar extinction coefficient , long charge diffusion length , efficient charge transport and extraction . These properties are linked to the crystal structure of the perovskite material, which can be tuned by adjusting composition as well as controlling nucleation and growth . One of the most straightforward approaches to bring perovskite solar cells to the market lies in combining it with the market-leading silicon PV technology to form tandem solar cells with performance beyond the single-junction cell limit. Hybrid perovskite cells have been demonstrated to be highly attractive for such tandem applications as a result of their tunable band gap, high overall performance and negligible sub-bandgap absorption . Here we propose to push this tandem concept further by designing novel perovskite materials and charge transporting materials with superior performances adapted to tandem integration with high-efficiency Si cells. To successfully target this ambitious goal we will 1) develop novel lead-free and stable perovskites based on non-toxic compounds with tunable absorption; 2) molecular engineer the active interfaces forming the stack by synthetizing ad hoc interfacial charge transfer layers with optimized energy level alignment and by controlling the interfacial processes therein; 3) engineer and optimize tandem structures integrating the novel perovskite materials with the high efficiency Si cell; 4) provide an in-depth fundamental understanding at different length scales, from material design to device properties, actually still missing. The approach will combine advanced materials characterization and modelling methods to guide the synthesis and provide a full understanding of the experimental findings. Within this framework, we propose a comprehensive interdisciplinary action plan based on five work packages interconnected in a holistic format. The strategy involves four partners with the unique and complementary know-how that will ensure a real breakthrough in material engineering and technological progression and a significant scientific advance in fundamental understanding. We expect that the interdisciplinary knowledge generated, which interconnects materials science, physics, chemistry, and engineering, will enable the development of a unified platform for the fabrication, comprehension and prediction of the key phenomena involved in novel hybrid semiconductors devices, eventually opening up many new concept.