Identification of the Molecular Precursors for Hydrazine Solution Processed CuIn(Se,S)2 Films and Their Interactions

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• 作者：Choong-Heui Chung ; Sheng-Han Li ; Bao Lei ; Wenbing Yang ; William W. Hou ; Brion Bob ; Yang Yang
• 刊名：Chemistry of Materials
• 出版年：2011
• 出版时间：February 22, 2011
• 年：2011
• 卷：23
• 期：4
• 页码：964-969
• 全文大小：821K
• 年卷期：v.23,no.4(February 22, 2011)
• ISSN：1520-5002

文摘

We investigate the molecular species present in hydrazine CuIn(Se,S)₂ precursor solutions, their interactions, and phase formation in solution processed CuIn(Se,S)₂ thin films through Raman spectroscopy. The reaction between Cu₂S and sulfur yields [Cu₆S₄]^{2鈭?/sup> ions, while [In₂Se₄]2鈭?/sup> ions are formed by the reaction of In₂Se₃ with selenium within their respective solutions. Once combined to prepare a CuIn(Se,S)₂ precursor solution, these two species appear to be bridged via newly formed In鈭扴 bonds. The creation of the In鈭扴 bonds in the CuIn(Se,S)₂ precursor solution provides strong evidence for the mixing of copper, indium, sulfur, and selenium at a molecular level even prior to deposition. From this configuration, relatively little atomic diffusion is required to reach the chalcopyrite structure, which enables the formation of highly uniform polycrystalline CuIn(Se,S)₂ films at relatively low temperatures.}