Transition Metal Germanium Chalcogenide Materials: Solvothermal Syntheses, Flexible Crystal, Structures, and Photoelectric Response Property
Can Cui, Hong Pan, Ke Wang, Menghe Baiyin
Abstract
The chalcogenides Cs 2 CdGeSe 4 ( 1 ), Cs 2 Hg 2 GeSe 5 ( 2 ), and Na 3 RbCu 8 Ge 3 S 12 ( 3 ) were synthesized by solvothermal condition. Germanium chalcogenides containing transition metals have flexible crystal structures. Compound 1 has a one-dimensional (1-D) chain structure consisting of anionic chain ∞ 1 {[GeCdSe 4 ] 2– } and Cs + cations. Compound 2 is a zero-dimensional (0-D) cluster structure consisting of anionic clusters of [GeHgSe 5 ] 2– and Cs + cations. Compound 3 is a three-dimensional (3-D) network structure consisting of a copper-rich [Cu 8 Ge 3 S 12 ] 4– anion and Na + and Rb + cations. Transition metal compounds with inorganic frameworks have abundant optical and electrical properties. We explored the photocurrent response of compounds 1 – 3 . There are remarkable photocurrent densities for compounds 1 – 3, especially 1 with a density of 180 μA/cm 2, which is superior to most germanium chalcogenides.