title: Low-Pressure Vapor-Assisted Solution Process for Thiocyanate-Based Pseudohalide Perovskite Solar Cells.
abstract: In this report, we fabricated thiocyanate-based perovskite solar cells with low-pressure vapor-assisted solution process (LP-VASP) method. Photovoltaic performances are evaluated with detailed materials characterizations. Scanning electron microscopy images show that SCN-based perovskite films fabricated using LP-VASP have long-range uniform morphology and large grain sizes up to 1 μm. The XRD and Raman spectra were employed to observe the characteristic peaks for both SCN-based and pure CH3NH3PbI3perovskite. We observed that the Pb(SCN)2film transformed to PbI2before the formation of perovskite film. X-ray photoemission spectra (XPS) show that only a small amount of S remained in the film. Using LP-VASP method, we fabricated SCN-based perovskite solar cells and achieved a power conversion efficiency of 12.72 %. It is worth noting that the price of Pb(SCN)2is only 4 % of PbI2. These results demonstrate that pseudo-halide perovskites are promising materials for fabricating low-cost perovskite solar cells.
authors.affiliation: Department of Photonics, National Cheng Kung University, Tainan, 701, Taiwan.
authors.forename: Yu-Hsien
authors.initials: YH
authors.lastname: Chiang
authors.affiliation: Department of Photonics, National Cheng Kung University, Tainan, 701, Taiwan.
authors.forename: Hsin-Min
authors.initials: HM
authors.lastname: Cheng
authors.affiliation: Department of Photonics, National Cheng Kung University, Tainan, 701, Taiwan.
authors.forename: Ming-Hsien
authors.initials: MH
authors.lastname: Li
authors.affiliation: Department of Photonics, National Cheng Kung University, Tainan, 701, Taiwan.|Research Center for Energy Technology and Strategy (RCETS), National Cheng Kung University, Tainan, 701, Taiwan.|Advanced Optoelectronics Technology Center (AOCT), National Cheng Kung University, Tainan, 701, Taiwan.
authors.forename: Tzung-Fang
authors.initials: TF
authors.lastname: Guo
authors.affiliation: Department of Photonics, National Cheng Kung University, Tainan, 701, Taiwan. petercyc@mail.ncku.edu.tw.|Research Center for Energy Technology and Strategy (RCETS), National Cheng Kung University, Tainan, 701, Taiwan. petercyc@mail.ncku.edu.tw.|Advanced Optoelectronics Technology Center (AOCT), National Cheng Kung University, Tainan, 701, Taiwan. petercyc@mail.ncku.edu.tw.
authors.forename: Peter
authors.initials: P
authors.lastname: Chen
mesh_terms: D017610:Calcium Compounds / Q000737:chemistry*; D011211:Electric Power Supplies; D010087:Oxides / Q000737:chemistry*; D011312:Pressure; D012993:Solar Energy; D012996:Solutions; D013499:Surface Properties; D013861:Thiocyanates / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*; D014835:Volatilization
chemical_list: D017610:Calcium Compounds; D010087:Oxides; D012996:Solutions; D013861:Thiocyanates; C059910:perovskite; D014025:Titanium; C031760:thiocyanate
keywords: perovskite; pseudohalide; solar cells; structure transformation; vapor deposition