Synthesis, Structure, Band Gap, and Near-Infrared Photosensitivity of a New Chalcogenide Crystal, (NH4)4Ag12Sn7Se22

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• 作者：Ke-Zhao Du ; Xing-Hui Qi ; Mei-Ling Feng ; Jian-Rong Li ; Xing-Zhi Wang ; Cheng-Feng Du ; Guo-Dong Zou ; Meng Wang ; Xiao-Ying Huang
• 刊名：Inorganic Chemistry
• 出版年：2016
• 出版时间：June 6, 2016
• 年：2016
• 卷：55
• 期：11
• 页码：5110-5112
• 全文大小：295K
• 年卷期：0
• ISSN：1520-510X

文摘

A new chalcogenide crystal, (NH₄)₄Ag₁₂Sn₇Se₂₂ (FJSM-STS), has been solvothermally synthesized. The crystal structure, which is composed of arrays of [Sn₃Se₉]_n⁶ⁿ⁻ chains interconnecting [SnAg₆Se₁₀]_n¹⁰ⁿ⁻ and [Ag₃Se₄]_n⁵ⁿ⁻ layers, is unprecedented among the reported A/Ag/Sn/Q (A = cation; Q = S, Se, and Te) compounds. Optical absorption together with theoretical calculations of the band structure indicate a direct band gap of 1.21 eV for FJSM-STS, which is close to the ideal band gap to maximize the photoconversion efficiency proposed by Shockley and Queisser. The toxic-metal-free crystal of FJSM-STS exhibits obvious photosensitivity in the near-infrared range. The variates of power and temperature on the photosensitivity have been studied.