Document Type

Thesis

Date of Award

1-31-1993

Degree Name

Master of Science in Materials Science and Engineering - (M.S.)

Department

Committee for the Interdisciplinary Program in Materials Science and Engineering

First Advisor

Roland A. Levy

Second Advisor

James M. Grow

Abstract

Boron nitride thin films were deposited on silicon and fused quartz substrates using ammonia and the liquid precursor borane-triethylamine complex (TEAB) by low pressure chemical vapor deposition over a temperature range of 300-850°C, a pressure range of 0.21-0.6 torr, and an ammonia flow rate range of 0-740 sccm. An increased in the nitrogen content in the film due to the addition of ammonia flow resulted in a pronounced improvement in the optical transmission, an increase in the film uniformity and a decrease in the depletion effect. IR spectra of the films showed an asymmetrical wide band centered around 1400 cm-1 and a sharp band around 800 cm-1.

Boron-silicon nitride films were prepared with the incorporation of silicon into the BN films using liquid precursor mixtures consisting of TEAB and hexamethyldisilane (HMDS) at a given temperature, pressure, and ammonia flow rate. The addition of silicon to the films resulted in an achievement of tensile stress and showed an improvement in the mechanical strength of the films. In the IR spectra, two strong absorption peaks centered at 1300 cm-1 and 950 cm-1 appeared. Boron-silicon nitride membranes, 1 µm in thickness, were successfully made.

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