Semiconducting [(Bi4Te4Br2)(Al2Cl6鈥?i>xBrx)]Cl2 and [Bi2Se2Br](AlCl4): Cationic

详细信息    查看全文

• 作者：Kanishka Biswas ; In Chung ; Jung-Hwan Song ; Christos D. Malliakas ; Arthur J. Freeman ; Mercouri G. Kanatzidis
• 刊名：Inorganic Chemistry
• 出版年：2013
• 出版时间：May 20, 2013
• 年：2013
• 卷：52
• 期：10
• 页码：5657-5659
• 全文大小：233K
• 年卷期：v.52,no.10(May 20, 2013)
• ISSN：1520-510X

文摘

Lewis acidic organic ionic liquids provide a novel synthetic medium to prepare new semiconducting chalcogenides, [(Bi₄Te₄Br₂)(Al₂Cl_5.46Br_0.54)]Cl₂ (1) and [Bi₂Se₂Br](AlCl₄) (2). Compound 1 features a cationic [(Bi₄Te₄Br₂)(Al₂Cl_5.46Br_0.54)]²⁺ three-dimensional framework, while compound 2 consists of cationic layers of [Bi₂Se₂Br]²⁺. Spectroscopically measured band gaps of 1 and 2 are 0.6 and 1.2 eV, respectively. Thermoelectric power measurements of single crystals of 1 indicate an n-type semiconductor.