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Record Details

Record 5 of 23726
Transport Phenomena of Off-Axis Sputtering Deposition
Author and Affiliation:
Zhu, S.(NASA Marshall Space Flight Center, Huntsville, AL United States)
Su, C. H.(NASA Marshall Space Flight Center, Huntsville, AL United States)
Lehoczky, S. L.(NASA Marshall Space Flight Center, Huntsville, AL United States)
Zhang, S.(NASA Marshall Space Flight Center, Huntsville, AL United States)
Whitaker, Ann F. [Technical Monitor]
Abstract: Various high quality epitaxial films, especially oxides, have been synthesized using off-axis sputtering deposition. In this presentation, we report the experiment results of ZnO films grown by the off-axis sputtering deposition. Films were synthesized in temperatures ranged from room temperature to 600 C, and pressures from 5 mTorr to 150 mTorr. Film growth rate was measured by surface profilometer, ellipsometer, and wavelength dispersive spectrometry. Due to the collisions between the sputtered species and the residue gases, the kinetic energy of species was reduced and the transport of depositing species changed from a ballistic movement for low pressure to a diffuse drift for high pressure in which the transport species were almost thermalized. The measurements show an increase of growth rates along the gravity vector when the Knodson (Knudsen??) number of transport species is less than 0.05, which suggests that gravity affected the transport characterization in off-axis sputtering deposition. Because the product of pressure (p) and travel distance (d) of sputtered species, p exceeds several mTorr-cm during film deposition, the classical simulations for sputtering process in high vacuum system may not be applied. Based on these experimental measurements, a transport process of the off-axis sputtering deposition is proposed. Several methods including the Monte Carlo method and gravity-driven flow dynamics simulation will be discussed.
Publication Date: Jan 14, 2001
Document ID:
20010072417
(Acquired Aug 24, 2001)
Subject Category: DOCUMENTATION AND INFORMATION SCIENCE
Document Type: Preprint
Meeting Information: 2nd Pan-Pacific Basin Workshop on Microgravity Sciences; 1 May 2001; Pasadena, CA; United States
Financial Sponsor: NASA Marshall Space Flight Center; Huntsville, AL United States
Organization Source: NASA Marshall Space Flight Center; Huntsville, AL United States
Description: 1p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: DEPOSITION; SPUTTERING; TRANSPORT PROPERTIES; MEASURING INSTRUMENTS; MONTE CARLO METHOD; PROFILOMETERS; EPITAXY; KINETIC ENERGY; ELLIPSOMETERS
Availability Source: Other Sources
Availability Notes: Abstract Only
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