Boopathi, K.M.K.M.BoopathiKaruppuswamy, P.P.KaruppuswamySingh, A.A.SinghHanmandlu, C.C.HanmandluLin, L.L.LinAbbas, S.A.S.A.AbbasChang, C.C.C.C.ChangWang, P.C.P.C.WangLi, G.G.LiChu, C.W.C.W.ChuCHIEN-CHENG CHANG2020-04-282020-04-282017https://scholars.lib.ntu.edu.tw/handle/123456789/485923Organic-inorganic lead halide perovskites have recently emerged as highly competitive light absorbing materials for low cost solution-processable photovoltaic devices. With the high efficiency already achieved, removing the toxicity, i.e., lead-free and stability are the key obstacles for perovskite solar cells. Here, we report the synthesis of an antimony (Sb)-based hybrid material having the composition of A3Sb2I9 [A = CH3NH3 (MA), Cs] and an investigation of its potential photovoltaic applications. Sb-based perovskite-like materials exhibited attractive absorbance properties, with the band gaps of MA3Sb2I9 and Cs3Sb2I9 measured to be 1.95 and 2.0 eV, respectively. X-ray photoelectron spectroscopy confirmed the formation of stoichiometric perovskites from appropriate precursor molar ratios incorporated with hydroiodic acid (HI). Planar hybrid Sb-based solar cells exhibited negligible hysteresis and reproducible power output under working conditions. A power conversion efficiency of 2.04% was achieved by the MA3Sb2I9 perovskite-based device - the highest reported to date for a Sb-based perovskite solar cell. © 2017 The Royal Society of Chemistry.[SDGs]SDG7Efficiency; Energy gap; Hybrid materials; Perovskite; Perovskite solar cells; X ray photoelectron spectroscopy; Absorbance properties; Absorbing materials; Halide perovskites; Organic-inorganic; Photovoltaic applications; Photovoltaic devices; Power conversion efficiencies; Solution processable; Solar cellsjournal article10.1039/c7ta06679a2-s2.0-85031128279https://www.scopus.com/inward/record.uri?eid=2-s2.0-85031128279&doi=10.1039%2fc7ta06679a&partnerID=40&md5=68bdd5993e5eb7ee1b240fdd3f97f178