METHOD AND APPARATUS FOR APPLYING AMORPHOUS SILICON HYDRIDE TO SUBSTRATE IN PLASMA CHAMBER

摘要

A plasma enclosure (2) containing two electrodes (3 and 4) coupled to a high-frequency generator (5), the substrate (7) being mounted on one of the electrodes. A gas containing at least one silicon compound is introduced into the enclosure and a plasma (8) is created by a radio frequency between the electrodes. The invention is aimed at obtaining a high rate of deposition of semiconductive amorphous silicon on the substrate at the same time as a small number of faults in the deposited film. This objective is obtained by choosing an optimum value of between 30 and 100 MHz/cm for the f/d ratio between the frequency and the distance separating the electrodes, the frequency being between 25 and 150 MHz. At the optimum frequency the rate of deposition is at a maximum and the number of faults is at a minimum. This process can be employed for the deposition of hydrogenated amorphous silicon or of one of its alloys from different gases or gas mixtures, and for producing doped layers. ……