Chemical bonds and spin properties of a-Si/sub x/Ge/sub y/:H/sub z/ alloys

Hydrogenated amorphous silicon-germanium alloy's are considered important low band gap materials for thin film solar cell technology, but the dangling bond densities increase with the germanium content to prohibitive values. The authors report on IR and electron spin resonance spectra and show...

Full description

Saved in:
Bibliographic Details
Published in:Thin solid films 1991, Vol.205(2), p.223-6
Main Authors: Basrour, Skandar, Bustarret, Etienne, Bruyere, J.C.
Format: Article
Language:English
Subjects:
Engineering Sciences
Micro and nanotechnologies
Microelectronics
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Hydrogenated amorphous silicon-germanium alloy's are considered important low band gap materials for thin film solar cell technology, but the dangling bond densities increase with the germanium content to prohibitive values. The authors report on IR and electron spin resonance spectra and show some relationships between the preferential attachment of hydrogen, the dangling configurations and the preparation conditions in the plasma. They discuss the g values using the theoretical model proposed by Ishii (1982) for such binary alloys. These values and the peak-to-peak linewidth Delta H deduced from derivative absorption curves exhibit a strong modification with the germanium content of the local environment of the dangling bond. They confirm that a moderate substrate temperature and a high dilution of the reactant gases in hydrogen lead to better alloys.
ISSN:0040-6090
DOI:10.1016/0040-6090(91)90304-G