Polycrystalline Si1-x
Ge
x
thin film deposition by rapid thermal chemical vapor deposition |
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Authors: | Young-Bae Park Yong-Woo Choi Xiaodong Li |
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Affiliation: | (1) Thomas J. Watson Laboratories of Applied Physics California Institute of Technology, (CALTECH) MC 128-95, Pasadena, CA, 91125;(2) Microsystem Technology Laboratory (MTL), Massachusetts Institute of Technology (MIT), 60 Vassar street #39-657, Cambridge, MA, 02139;(3) Department of Mechanical Engineering, University of South Carolina, 300 Main Street, Columbia, SC, 29208 |
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Abstract: | Polycrystalline silicon germanium (poly-Si1−xGex) thin films on a-Si film have been deposited by rapid thermal chemical vapor deposition (RTCVD) with SiH4–GeH4–H2. Effect of GeH4/SiH4 and deposition temperature on stoichiometry (x), Si-Ge binding character, composition, hydrogen configuration, crystallinity, preferred orientation, grain size, and surface
roughness of poly-Si1−xGex films has been investigated. Poly-Si1−xGex deposited on the substrate with amorphous silicon buffer layer on oxide shows better crystallinity and contains the less
amount of oxygen than the one deposited directly on the oxide surface. At low temperature region, the Ge–H bond with the small
amount of Si–H2 bond is dominant but all hydrogen bonds are desorbed at high temperature. All films have polycrystalline phase and the grain
size and (111) orientation increased with increasing deposition temperature in which Ge content also increases at the fixed
gas flow rate of GeH4 to total source gas. Poly-Si1−xGex/Si thin film transistors (TFT) are fabricated and hydrogen during post-hydrogenation process preferentially is attached to
Ge dangling bond and the TFT characteristics could be improved. |
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