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Title: Variable temperature semiconductor film deposition

A method of depositing a semiconductor material on a substrate is disclosed. The method sequentially comprises (a) providing the semiconductor material in a depositable state such as a vapor for deposition on the substrate; (b) depositing the semiconductor material on the substrate while heating the substrate to a first temperature sufficient to cause the semiconductor material to form a first film layer having a first grain size; (c) continually depositing the semiconductor material on the substrate while cooling the substrate to a second temperature sufficient to cause the semiconductor material to form a second film layer deposited on the first film layer and having a second grain size smaller than the first grain size; and (d) raising the substrate temperature, while either continuing or not continuing to deposit semiconductor material to form a third film layer, to thereby anneal the film layers into a single layer having favorable efficiency characteristics in photovoltaic applications. A preferred semiconductor material is cadmium telluride deposited on a glass/tin oxide substrate already having thereon a film layer of cadmium sulfide.
Authors:
;
Publication Date:
OSTI Identifier:
570434
Report Number(s):
US 5,712,187/A/
PAN: US patent application 8-555,621
DOE Contract Number:
AC36-83CH10093
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 27 Jan 1998
Research Org:
Midwest Research Institute
Sponsoring Org:
USDOE, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 14 SOLAR ENERGY; SURFACE COATING; CADMIUM TELLURIDES; CADMIUM TELLURIDE SOLAR CELLS; TEMPERATURE DEPENDENCE; GRAIN SIZE; SUBSTRATES