title: Bandgap Engineering of Lead-Halide Perovskite-Type Ferroelectrics.
abstract: Semiconducting ferroelectricity is realized in hybrid perovskite-type compounds (cyclohexylammonium)2 PbBr4-4 x I4 x (x = 0-1). By adjusting the composition x, the bandgap is successfully tuned from previously reported 3.65 eV to as low as 2.74 eV, and the excellent ferroelectricity was kept intact. This finding may contribute to improving the photoelectronic and/or photovoltaic performance of hybrid perovskite-type compounds.
authors.affiliation: Ordered Matter Science Research Center, Southeast University, Nanjing, 211189, P. R. China.
authors.forename: Heng-Yun
authors.initials: HY
authors.lastname: Ye
authors.affiliation: Ordered Matter Science Research Center, Southeast University, Nanjing, 211189, P. R. China.
authors.forename: Wei-Qiang
authors.initials: WQ
authors.lastname: Liao
authors.affiliation: Fujian Institute of Research on the Structure of Matter, The Chinese Academy of Sciences, Fuzhou, Fujian, 350002, P. R. China.
authors.forename: Chun-Li
authors.initials: CL
authors.lastname: Hu
authors.affiliation: Ordered Matter Science Research Center, Southeast University, Nanjing, 211189, P. R. China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Ordered Matter Science Research Center, Southeast University, Nanjing, 211189, P. R. China.
authors.forename: Yu-Meng
authors.initials: YM
authors.lastname: You
authors.affiliation: Fujian Institute of Research on the Structure of Matter, The Chinese Academy of Sciences, Fuzhou, Fujian, 350002, P. R. China.
authors.forename: Jiang-Gao
authors.initials: JG
authors.lastname: Mao
authors.affiliation: Ordered Matter Science Research Center, Southeast University, Nanjing, 211189, P. R. China.
authors.forename: Peng-Fei
authors.initials: PF
authors.lastname: Li
authors.affiliation: Ordered Matter Science Research Center, Southeast University, Nanjing, 211189, P. R. China.
authors.forename: Ren-Gen
authors.initials: RG
authors.lastname: Xiong
keywords: bandgap engineering; ferroelectricity; metal halide perovskites; phase transitions; semiconductivity