Perovskite/crystalline silicon tandem solar cells fabricated by non-vacuum-process

Silicon solar cells and perovskite solar cells were fabricated by non-vacuum printed processes in our group. Screen-printing, spin coating and spray pyrolysis deposition techniques were utilized mainly. Low temperature and non-vacuum processed TiO₂ layer and Al₂O₃ layer and Al₂O₃/TiO₂ double layer were introduced as an alternative anti-reflection coating film. In-house developed polyvinyl alcohol based aluminum pastes were also introduced for solar cell applications. p-type crystalline silicon solar cells were fabricated with over 17% conversion efficiency with non-vacuum processes. On the other hand, perovskite solar cells using organic or inorganic hole-transporting materials can be reach the conversion efficiency over 12%. Finally, a two terminal tandem solar cells with structure of <;perovskite top cell/Au/ (w/ or w/o)Ag nano electrode/crystalline silicon bottom cell> were fabricated using these solar cells and V_oc of 1.38 V was achieved.