Formation of low temperature silicon dioxide films using chemical vapor deposition

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Title: Formation of low temperature silicon dioxide films using chemical vapor deposition
Author: Chen, Hsiao-Hui
Abstract: Low Temperature Oxide (LTO) thin films were prepared using a Low Pressure Chemical Vapor Deposition process. The process was characterized by applying traditional statistical studies and response surface technique. The uniformities within wafer and from wafer to wafer were examined by determining the mean and the standard deviation of films thicknesses. Response surface methodology was employed to determine the optimum process conditions. Time, temperature and gas flow ratio were used as the experimental factors. Index of refraction and deposition rate were used as the experimental responses. Additionally, etch rate, density, dielectric constant and infrared (IR) spectra were found for the silicon dioxide films prepared at the determined optimum condition. The IR spectra were obtained by employing Fourier Transform Infrared Spectroscopy (FTIR). The average deposition rate was found to be 46 A per minute and the average index of refraction was 1.44. The calculated density, activation energy, etch rate, dielectric constant and dielectric strength agreed with reported values. A double metal test run was performed using LTO oxide. The results indicated that the recommended baseline LTO process is suitable for multilayer metallization processes.
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Date: 1991-09-10

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