Morphology and crystal phase evolution of doctor-blade coated CuInSe2 thin films |
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Authors: | Dongwook Lee Youngwoo ChoiKijung Yong |
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Institution: | Surface Chemistry Laboratory of Electronic Materials, Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea |
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Abstract: | CuInSe2 (CIS) chalcopyrite thin films were prepared using a low-cost, non-vacuum doctor-blade coating and the thermal annealing method. An acetone-based precursor solution containing copper chloride, indium chloride, selenium chloride, and an organic binder was deposited onto a Mo-sputtered soda lime glass substrate using a doctor-blade coating method. After coating, the precursor films were annealed in a quartz tube furnace under low vacuum without the use of a Se atmosphere or reduction conditions. Evolution of the morphology, crystal structure, and thermal decomposition behavior of the films was analyzed by X-ray diffraction, scanning electron microscopy, and thermogravimetric analysis, and the film formation mechanism was suggested. The as-deposited precursor film gradually decomposed with increase in temperature and formed Cu2−xSe and In2Se3 nuclei on the surface of the film. Incorporation of Cu2−xSe with In2Se3 yielded a chalcopyrite CIS phase, which crystallized on annealing above 400 °C. The obtained CIS film showed low-resistive ohmic behavior with a Mo electrode and a high absorption efficiency for visible–infrared (IR) light, making it suitable for use in photovoltaic applications. |
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Keywords: | A1 Characterization A1 Nanostructure B1 Nanomaterials |
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