Copper zinc tin sulfide layers prepared from solution processable metal dithiocarbamate precursors

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• 作者：Michael Edler ; Thomas Rath ; Alex ; er Schenk ; Achim Fischereder ; Wernfried Haas ; Matthias Edler ; Boril Chernev ; Birgit Kunert ; Ferdin ; Hofer ; Rol ; Resel ; Gregor Trimmel
• 关键词：Chalcogenides ; Chemical Synthesis ; Thin films
• 刊名：Materials Chemistry and Physics
• 出版年：2012
• 出版时间：15 October, 2012
• 年：2012
• 卷：136
• 期：2-3
• 页码：582-588
• 全文大小：734 K

文摘

In this contribution we present a solution based route toward copper zinc tin sulfide - CZTS - layers using metal dithiocarbamate precursors. We focus on the synthesis of the precursor materials as well as on the fabrication of thin CZTS layers at low temperatures of 350?¡ãC and their characterization. Powder X-ray diffraction measurements show that a precursor solution containing an excess of the zinc precursor, compared to the Cu and Sn precursors, has to be used to obtain CZTS films without secondary phases. Thus, the prepared films are Zn-rich, which is beneficial for solar cell applications. Raman as well as X-ray photoelectron spectroscopy studies confirm the formation of CTZS. No clear evidence for free ZnS has been found. Electron microscopy shows agglomerates of 10?nm-sized crystallites forming spherical particles with a diameter between 50?nm and 400?nm. The prepared films possess high optical absorption (>1.10⁴?cm^?1) and an optical band gap of approximately 1.6?eV.