Molecular Solution Approach To Synthesize Electronic Quality Cu2ZnSnS4 Thin Films

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• 作者：Wenbing Yang ; Hsin-Sheng Duan ; Kitty C. Cha ; Chia-Jung Hsu ; Wan-Ching Hsu ; Huanping Zhou ; Brion Bob ; Yang Yang
• 刊名：The Journal of the American Chemical Society
• 出版年：2013
• 出版时间：May 8, 2013
• 年：2013
• 卷：135
• 期：18
• 页码：6915-6920
• 全文大小：333K
• 年卷期：v.135,no.18(May 8, 2013)
• ISSN：1520-5126

文摘

Successful implementation of molecular solution processing from a homogeneous and stable precursor would provide an alternative, robust approach to process multinary compounds compared with physical vapor deposition. Targeting deposition of chemically clear, high quality crystalline films requires specific molecular structure design and solvent selection. Hydrazine (N₂H₄) serves as a unique and powerful medium, particularly to incorporate selected metallic elements and chalcogens into a stable solution as metal chalcogenide complexes (MCC). However, not all the elements and compounds can be easily dissolved. In this manuscript, we demonstrate a paradigm to incorporate previously insoluble transitional-metal elements into molecular solution as metal鈥揳tom hydrazine/hydrazine derivative complexes (MHHD), as exemplified by dissolving of the zinc constituent as Zn(NH₂NHCOO)₂(N₂H₄)₂. Investigation into the evolution of molecular structure reveals the hidden roadmap to significantly enrich the variety of building blocks for soluble molecule design. The new category of molecular structures not only set up a prototype to incorporate other elements of interest but also points the direction for other compatible solvent selection. As demonstrated from the molecular precursor combining Sn-/Cu-MCC and Zn-MHHD, an ultrathin film of copper zinc tin sulfide (CZTS) was deposited. Characterization of a transistor based on the CZTS channel layer shows electronic properties comparable to CuInSe₂, confirming the robustness of this molecular solution processing and the prospect of earth abundant CZTS for next generation photovoltaic materials. This paradigm potentially outlines a universal pathway, from individual molecular design using selected chelated ligands and combination of building blocks in a simple and stable solution to fundamentally change the way multinary compounds are processed.