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The Cu Concentration Effect on the Electro-Optical Properties of Cu2ZnSnSe4 Thin Films Prepared by a Non-Vacuum Solution-Based Nano-Inks Process

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Cu2ZnSnSe4 (CZTSe) nanocrystals (NCs) were synthesized via a coordinating-solvent-based synthesis method using elemental sources. The precipitated NCs were redispersed in toluene to form ink solutions for characterization. The properties of thin films of these inks were investigated as a function of the chemical compositions of the inks. The Cu/(Zn+Sn) ratio of the inks was varied from 0.7 to 1.0, while the Zn/Sn ratio was kept constant at 1. The CZTSe thin film of the ink with a Cu/(Zn+Sn) ratio of 1 exhibited a Cu2−x Se phase. In addition, the absorption edges of the Cu-poor CZTSe thin films (i.e., the films with Cu/(Zn+Sn) ratios of 0.7, 0.8 and 0.9) were red shifted. Photodetectors (PDs) with a Au/CZTSe/soda-lime glass structure were fabricated. The PD corresponding to a Cu/(Zn+Sn) ratio of 0.70 exhibited excellent photoresponsivity, and its dark current was 7.65 × 10−7 A when a bias of 10 V was applied.
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Keywords: CU; CU2ZNSNSE4; INK SOLUTIONS; NANOCRYSTALS; PHOTODETECTORS; THIN FILMS

Document Type: Research Article

Publication date: January 1, 2014

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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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