[17p-PB2-1~8] 12.8 Specific theme: Photoelectric Properties, Device Fabrication and Structural Controls of Organic-Inorganic Hybrid Perovskites

[17p-PB2-8] Structure and electronic properties of germanium halide perovskite compounds

〇(M2)Hatsumi Yoshiki^1,2, Hironori Ogata^1,2,3, Koichiro Mifu³, Ikuzo Kanazawa³ (1.Grad. Sch. Sci. and Engin., Hosei Univ., 2.Dept. Chem. Sci. and Technol., Hosei Univ., 3.Research Center for Micro-Nano Technol., Hosei Univ.)

Keywords:

semiconductor,electric physics,perovskite

The germanium halide perovskite compounds MAGeI3, FAGeI3, and CsGeI3 crystallize in the trigonal R3m structure. Accordingly, a symmetry lowering from a higher-symmetry parent phase introduces a polar distortion, in which the order parameter develops along the threefold axis. Under 3m point symmetry, the in-plane directions (a,b) and the threefold-axis direction (c) are no longer equivalent, and a primarily uniaxial strain component along the c axis emerges in response to an applied electric field and/or internal state variables.In this study, we examine the relationship between charge-transport characteristics and lattice response through electrical measurements and structural characterization along the c axis.