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Cadmium sulfide thin film deposition: A parametric study using microreactor-assisted chemical solution deposition

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https://ir.library.oregonstate.edu/concern/articles/pg15bf59j

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Abstract
  • Cadmium sulfide (CdS) thin films are commonly used as buffer layers in thin film solar cells and can be produced by a number of solution and vacuum methods. We report the continuous solution deposition of CdS on fluorine-doped tin oxide coated glass substrates using Microreactor-Assisted Solution Deposition (MASD (TM)). A flow system consisting of a microscale T-mixer and a novel adjustable residence time microchannel heat exchanger has been utilized in this study. The CdS thin film synthesis involves a multistage mechanism in which an undesirable homogeneous reaction competes with the desired heterogeneous reaction. A microchannel heat exchanger with an adjustable residence time unit has been developed to optimize the reaction residence time and favor heterogeneous growth. Optimization of CdS reaction solution residence time facilitates improved control of CdS synthesis by minimizing the homogeneous reaction and subsequently improving key parameters for process scale-up such as yield and selectivity. The present study indicates that a residence time range of 13-20 s at a solution temperature of 90 degrees C and deposition time of 3 min yields similar to 40 nm thick CdS film. The CdS films were characterized by UV-vis spectroscopy, SEM-EDS, TEM, and X-ray diffraction. Published by Elsevier B.V.
  • This is the publisher’s final pdf. The published article is copyrighted by Elsevier and can be found at: www.elsevier.com/.
  • Keywords: CdS buffer layer, Continuous flow, Chemical solution deposition, Microchannel heat exchanger, Chemical bath deposition, CdS window layer
  • Keywords: CdS buffer layer, Continuous flow, Chemical solution deposition, Microchannel heat exchanger, Chemical bath deposition, CdS window layer
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  • Ramprasad, S., Su, Y., Chang, C., Paul, B., & Palo, D. (2012). Cadmium sulfide thin film deposition: A parametric study using microreactor-assisted chemical solution deposition. Solar Energy Materials and Solar Cells, 96(1), 77-85. doi: 10.1016/j.solmat.2011.09.015
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  • 96
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  • 1
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  • The work described herein was funded by the US Department of Energy, Industrial Technologies Program through Award #NT08847, under Contract DE-AC-05-RL01830 to PNNL. Additional matching funds were received from the Oregon Nanoscience and Microtechnologies Institute (ONAMI) under a matching grant to Oregon State University.
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