New Paper- Tailoring perovskite crystallization and interfacial passivation in efficient, fully textured perovskite silicon tandem solar cells

Fully textured perovskite silicon tandem solar cells rely on the deposition of the perovskite absorber on textured silicon with a >1 μm pyramid size, which represents the current standard in the industry. To bridge the gap between research and industry, these cells must demonstrate a high power output. Nevertheless, perovskite absorbers deposited on large pyramids often suffer from a high grain boundary defect density and poor interfacial passivation at the perovskite/electron transport layer (C60) junction. In our recent work, we tackle both loss mechanisms by introducing a multi-functional additive (urea), which simultaneously regulates the perovskite crystallization as well as passivates the perovskite/C60 interface. Moreover, this strategy is employed at a low annealing temperature (100°C, different from the standardly used 150°C), thus enabling an effective lowering of the perovskite annealing’s thermal budget. This approach is of high relevance for the industrialization of perovskite silicon tandem solar cells.

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