CUED Publications database

Low-temperature (≤600 °C) semi-insulating oxygen-doped silicon films by the PECVD technique for large-area power applications

Clough, FJ and Brown, AO and Madathil, SNE and Milne, WI (1995) Low-temperature (≤600 °C) semi-insulating oxygen-doped silicon films by the PECVD technique for large-area power applications. Thin Solid Films, 270. pp. 517-521. ISSN 0040-6090

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Abstract

This work describes the deposition, annealing and characterisation of semi-insulating oxygen-doped silicon films at temperatures compatible with polysilicon circuitry on glass. The semi-insulating layers are deposited by the plasma enhanced chemical vapour deposition technique from silane (SiH4), nitrous oxide (N2O) and helium (He) gas mixtures at a temperature of 350 °C. The as-deposited films are then furnace annealed at 600 °C which is the maximum process temperature. Raman analysis shows the as-deposited and annealed films to be completely amorphous. The most important deposition variable is the N2O SiH4 gas ratio. By varying the N2O SiH4 ratio the conductivity of the annealed films can be accurately controlled, for the first time, down to a minimum of ≈10-7Ω-1cm-1 where they exhibit a T -1 4 temperature dependence indicative of a hopping conduction mechanism. Helium dilution of the reactant gases is shown to improve both film uniformity and reproducibility. A model for the microstructure of these semi-insulating amorphous oxygen-doped silicon films is proposed to explain the observed physical and electrical properties. © 1995.

Item Type: Article
Uncontrolled Keywords: Amorphous materials Annealing Electrical properties and measurements Plasma processing and deposition
Subjects: UNSPECIFIED
Divisions: UNSPECIFIED
Depositing User: Cron job
Date Deposited: 16 Jul 2015 13:15
Last Modified: 26 Jul 2015 03:21
DOI: 10.1016/0040-6090(95)06834-1