Abstract
Tandem solar cells, based on perovskite and crystalline silicon absorbers, are promising candidates for commercial applications. Tin oxide (SnO2), applied via the spin-coating method, has been among the most used electron transfer layers in normal (n-i-p) perovskite/silicon tandem cells. SnO2 synthesized by chemical bath deposition (CBD) has not yet been applied in tandem devices. This method shows improved efficiency in perovskite single cells and allows for deposition over a larger area. Our study is the first to apply low-temperature processed SnO2 via CBD to a homojunction silicon solar cell without additional deposition of a recombination layer. By controlling the reaction time, a tandem efficiency of 16.9% was achieved. This study shows that tandem implementation is possible through the CBD method, and demonstrates the potential of this method in commercial application to textured silicon surfaces with large areas.
Highlights
Comparison of Morphology According to Chemical Bath Deposition (CBD) Reaction Time
All silicon substrates polished on both sides were prepared by removing the native silicon oxide (SiOx) with dilute hydrofluoric acid (DHF) solution as recommended by Radio Corporation of America (RCA)
Our results support the potential of this process technology to replace spin-coating, Tin is oxide, which can realized by a low-temperature-solution hasalso highbe which not suitable for be application to large surfaces or commercialprocess, use
Summary
Reported for single-junction devices [1] PSCs are characterized by a perovskite material sandwiched between an electron transport layer (ETL) and a hole transport layer (HTL)
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