Bandgap Engineering of Lead-Halide Perovskite-Type Ferroelectrics

Heng-Yun Ye; Wei-Qiang Liao; Chun-Li Hu; Yi Zhang; Yu-Meng You; Jiang-Gao Mao; Peng-Fei Li; Ren-Gen Xiong

doi:10.1002/adma.201505224

Bandgap Engineering of Lead-Halide Perovskite-Type Ferroelectrics

Adv Mater. 2016 Apr 6;28(13):2579-86. doi: 10.1002/adma.201505224. Epub 2016 Feb 2.

Authors

Heng-Yun Ye¹, Wei-Qiang Liao¹, Chun-Li Hu², Yi Zhang¹, Yu-Meng You¹, Jiang-Gao Mao², Peng-Fei Li¹, Ren-Gen Xiong¹

Affiliations

¹ Ordered Matter Science Research Center, Southeast University, Nanjing, 211189, P. R. China.
² Fujian Institute of Research on the Structure of Matter, The Chinese Academy of Sciences, Fuzhou, Fujian, 350002, P. R. China.

PMID: 26833877
DOI: 10.1002/adma.201505224

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.

Keywords: bandgap engineering; ferroelectricity; metal halide perovskites; phase transitions; semiconductivity.