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Effect of RF Plasma Power and Deposition Temperature on the Surface Properties of Tin Oxide Deposited by Modified Plasma Enhanced Chemical Vapor Deposition

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Lower deposition temperatures for metal oxides are always favorable to prevent damage to substrates and ease of process. In present work, tin oxide thin films were deposited at low temperature (200 °C and 300 °C) by modifying plasma enhanced chemical vapor deposition system. Surface science experiments are important for better fundamental understanding of non-stoichiometric metal oxides and their applications (especially for understanding gas sensing mechanisms). Therefore in this report, a systematic study is presented to investigate the effect of plasma power (RF, 100 to 500 W) on the surface states of SnO2 thin films. Hydrated SnCl4 was used as precursor and oxygen (300 sccm) was used as a reactant gas. Fine granular morphology with tetragonal rutile structure is observed at the two deposition temperatures. Higher plasma power resulted in smoother morphology, improved crystallinity; lower sheet resistance values (∼0.1 KΩ/□ at 300 °C and 250 W, un-doped films). Sn-incorporation is found increasing with plasma power; evident by increased Sn 3d photoelectron peak. Fitting data revealed that Sn is composed of Sn4+ and O–Sn4+ only. The suggested deposition method can be of great industrial importance to grow tin oxide at lower temperature.
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Document Type: Research Article

Publication date: December 1, 2009

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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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