Synthesis, Crystal Structure, and Photoelectric Properties of a New Layered Bismuth Oxysulfide

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• 作者：Sha Meng ; Xian Zhang ; Ganghua Zhang ; Yaoming Wang ; Hui Zhang ; Fuqiang Huang
• 刊名：Inorganic Chemistry
• 出版年：2015
• 出版时间：June 15, 2015
• 年：2015
• 卷：54
• 期：12
• 页码：5768-5773
• 全文大小：476K
• ISSN：1520-510X

文摘

[Bi₂O₂]-containing tetragonal compounds have received enormous attention due to unique functions including ferroelectricity, photocatalysis, and superconductivity. Here, a new layered compound Bi₉O_7.5S₆ was synthesized via a facile hydrothermal route. The compound, belonging to a new structure type crystallizes in a rhombohedral system with space group R3虆m (a = 4.0685(1) 脜, c = 31.029(5) 脜, V = 444.8(1) 脜³, Z = 1). The overall crystal structure consists of alternatively packed unique [Bi₂O₂] and [BiS₂] layers along [001] which are combined with each other by van der Waals interaction. The phase purity of the product is confirmed by powder X-ray diffraction. XPS analyses indicate +3 for Bi and 鈭? for S atoms. The temperature dependence of resistivity 蟻(T) indicates that the semiconducting sample follows the mechanisms of variable range hopping (VRH) and adiabatic small polaron hopping (SPH). The direct-transition band gap, E_g = 1.27 eV derived from optical absorption spectrum, falls in the optimal region of solar absorber materials. Accordingly, the photoelectric measurement demonstrates the potential for applications for photovoltaic devices.