Synthesis in Ionic Liquids: [Bi<sub>2</sub>Te<sub>2</sub>Br](AlCl<sub>4</sub>), a Direct Gap Semiconductor with a Cationic Framework
作者:Kanishka Biswas、Qichun Zhang、In Chung、Jung-Hwan Song、John Androulakis、Arthur J. Freeman、Mercouri G. Kanatzidis
DOI:10.1021/ja107483g
日期:2010.10.27
The Lewis acidic ionic liquid EMIMBr-AlCl3 (EMIM = 1-ethyl-3-methylimidazolium) allows a novel synthetic route to the semiconducting layered metal chalcogenides halide [Bi2Te2Br](AlCl4) and its Sb analogue. [Bi2Te2Br](AlCl4) is a direct band gap, strongly anisotropic semiconductor and consists of cationic infinite layers of [Bi2Te2Br](+) and [AlCl4](-) anions inserted between the layers.