[24p-E206-1~12] 12.5 Organic solar cells

▲ [24p-E206-1] Phenethylammonium Thiocyanate Additive in Tin Perovskite for Efficient and Stable Pb-free Perovskite Solar Cells

〇(D)Dhruba KHADKA KHADKA¹, Yasihiro Shirai¹, Masatoshi Yanagida¹, Kenjiro Miyano¹ (1.NIMS, Tsukuba)

Keywords:Tin perovskite, Pseudohalide additive, Stability

The progress of tin-based halide perovskite solar cells (Sn-HaPSCs) is obstructed by their poor stability arising from tin oxidation. Herein, we introduced the phenethylammonium thiocyanate (PEASCN) as a pseudohalide functional additive into FASnI₃ perovskite film to improve the optoelectronic properties. This approach is found to be effective for the suppression of Sn-oxidation and the formation of compact and larger grain film with a higher degree of crystallinity. The device with PEASCN additive improved the device efficiency from 4.52% (for pristine Sn-HaP) to 9.65% with superior device stability. The device analysis revealed that the PEASCN additive has improved the optoelectronic properties coupled with higher built-in potential and suppression of bulk and interface defect in the Sn-HaPSC. This work corroborates that the incorporation of pseudohalide-based functional additive in the FASnI₃ is propitious for better film formation, passivation of detrimental surface chemistry, and defects at interface and bulk.