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Title: Defect formation mechanism during PECVD of a-Si:H

Abstract

Defect formation mechanism in a-Si:H during PECVD at substrate temperature below 250 C is considered to be breaking of weak bonds in the Urbach tail. To break weak bonds, an extra energy is necessary. This energy is supplied by the reaction energy of SiH{sub 3} precursor at the growing surface incorporating SiH{sub 2} into the network. The defect density is experimentally shown to be proportional to a product of the energy supply frequency, i.e., SiH{sub 2} density, and the weak bond density which is obtained by the Urbach energy. By analysis using the configurational coordinate diagram the energy level of the broken weak bond is determined to be 0.2 eV above the valence band mobility edge. There is similarity of the defect formation mechanism during deposition to that of the Staebler-Wronski effect.

Authors:
;
Publication Date:
Research Org.:
Science Univ. of Tokyo, Noda, Chiba (JP)
OSTI Identifier:
20085534
Resource Type:
Conference
Resource Relation:
Conference: Amorphous and Microcrystalline Silicon Technology - 1997, San Francisco, CA (US), 03/31/1997--04/04/1997; Other Information: PBD: 1997; Related Information: In: Amorphous and microcrystalline silicon technology--1997. Materials Research Society symposium proceedings, Volume 467, by Wagner, S.; Hack, M.; Schiff, E.A.; Schropp, R.; Shimizu, I. [eds.], 999 pages.
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CRYSTAL DEFECTS; SILICON; HYDROGEN ADDITIONS; AMORPHOUS STATE; CHEMICAL VAPOR DEPOSITION; CHEMICAL BONDS; ENERGY LEVELS

Citation Formats

Maeda, Keiji, and Umezu, Ikurou. Defect formation mechanism during PECVD of a-Si:H. United States: N. p., 1997. Web.
Maeda, Keiji, & Umezu, Ikurou. Defect formation mechanism during PECVD of a-Si:H. United States.
Maeda, Keiji, and Umezu, Ikurou. 1997. "Defect formation mechanism during PECVD of a-Si:H". United States.
@article{osti_20085534,
title = {Defect formation mechanism during PECVD of a-Si:H},
author = {Maeda, Keiji and Umezu, Ikurou},
abstractNote = {Defect formation mechanism in a-Si:H during PECVD at substrate temperature below 250 C is considered to be breaking of weak bonds in the Urbach tail. To break weak bonds, an extra energy is necessary. This energy is supplied by the reaction energy of SiH{sub 3} precursor at the growing surface incorporating SiH{sub 2} into the network. The defect density is experimentally shown to be proportional to a product of the energy supply frequency, i.e., SiH{sub 2} density, and the weak bond density which is obtained by the Urbach energy. By analysis using the configurational coordinate diagram the energy level of the broken weak bond is determined to be 0.2 eV above the valence band mobility edge. There is similarity of the defect formation mechanism during deposition to that of the Staebler-Wronski effect.},
doi = {},
url = {https://www.osti.gov/biblio/20085534}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jul 01 00:00:00 EDT 1997},
month = {Tue Jul 01 00:00:00 EDT 1997}
}

Conference:
Other availability
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