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Researchers from the University of Freiburg, Fraunhofer ISE and partner institutions studied sequential thermal evaporation for perovskite-silicon tandem solar cells. They presented a fully solvent-free top cell in a 2-terminal tandem device. The tandem achieved a champion power conversion efficiency of 27.3% and a stabilized efficiency of 27.0%. Using in situ X-ray diffraction, the researchers observed higher conversion of lead halides into perovskite on micro-textured silicon than on planar substrates. Morphological analysis revealed compact lead-halide layers on planar substrates and porous layers on textured substrates. The researchers also identified interlayer mixing after formamidinium iodide deposition and halide redistribution during annealing. Evaporated EDAI passivation improved surface electronic properties and penetrated beyond the perovskite surface.
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