Preparation and formation mechanism of silver gallium selenide powders prepared via the sol-gel method

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• 作者：Guo-Ruei Chiu ; Chung-Hsin Lu
• 关键词：Sol&ndash ; gel growth ; Inorganic compounds ; Electronic materials ; Semiconductors
• 刊名：Materials Chemistry and Physics
• 出版年：16 December, 2013
• 年：2013
• 卷：143
• 期：1
• 页码：275-280
• 全文大小：1446 K

文摘

The sol-gel method followed by selenization was developed to synthesize AgGaSe₂ powders in this study. The molar ratio of gallium ions to silver ions was controlled to prepare pure AgGaSe₂ powders. Two selenization processes were employed to investigate the formed phases of the obtained powders. When the sol-gel-derived precursors were mixed with selenium powders, pure-phase AgGaSe₂ powders were formed after selenization. Without mixing selenium powders, AgGaSe₂ was produced with the impurity phase of Ag₉GaSe₆. A three-step reaction mechanism for the formation of AgGaSe₂ is proposed. Ag₂Se is initially formed in the first step, and then reacts with constituent species as well as hydrogen to produce Ag₉GaSe₆. Finally AgGaSe₂ is formed from the reaction among Ag₉GaSe₆, Ga₂O₃, Se and H₂. When the selenium powders are mixed with the precursors, liquid selenium is formed in the selenization process and effectively promotes the reactions.