Perovskite multijunction solar cells
High-quality perovskite materials that absorb different colors of sunlight can be obtained by changing the chemical composition of the perovskite film. Stacking various perovskite materials that can absorb different colors in one device, namely a perovskite multijunction solar cell, offers an exciting route to break the efficiency limit at a low fabrication cost. Manufacturing such multijunction solar cells is a non-trivial task, given that different material layers need to be deposited on top of each other while also being compatible with each other. Each perovskite material requires a certain film formation strategy to achieve high performance, which imposes tremendous processing challenges.
My research focuses on developing new techniques to manufacture high-quality perovskite layers at various optical bandgaps and integrating them in tandem cells with perovskites, Si, and copper indium gallium selenide (CIGS) photovoltaics. I am also working on mitigating energetic losses at each junction and reducing optical losses of tandem devices using new solar cell architectures.