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Title: Multi-phase back contacts for CIS solar cells

Multi-phase, single layer, non-interdiffusing M-Mo back contact metallized films, where M is selected from Cu, Ga, or mixtures thereof, for CIS cells are deposited by a sputtering process on suitable substrates, preferably glass or alumina, to prevent delamination of the CIS from the back contact layer. Typical CIS compositions include CuXSe{sub 2} where X is In or/and Ga. The multi-phase mixture is deposited on the substrate in a manner to provide a columnar microstructure, with micro-vein Cu or/and Ga regions which partially or fully vertically penetrate the entire back contact layer. The CIS semiconductor layer is then deposited by hybrid sputtering and evaporation process. The Cu/Ga-Mo deposition is controlled to produce the single layer two-phase columnar morphology with controllable Cu or Ga vein size less than about 0.01 microns in width. During the subsequent deposition of the CIS layer, the columnar Cu/Ga regions within the molybdenum of the Cu/Ga-Mo back layer tend to partially leach out, and are replaced by columns of CIS. Narrower Cu and/or Ga regions, and those with fewer inner connections between regions, leach out more slowly during the subsequent CIS deposition. This gives a good mechanical and electrical interlock of the CIS layer into the Cu/Ga-Momore » back layer. Solar cells employing In-rich CIS semiconductors bonded to the multi-phase columnar microstructure back layer of this invention exhibit vastly improved photo-electrical conversion on the order of 17% greater than Mo alone, improved uniformity of output across the face of the cell, and greater Fill Factor. 15 figs.« less
Inventors:
;
Issue Date:
OSTI Identifier:
170450
Assignee:
Rockett, A.A.; Yang, L.C. CHO; SCA: 140501; PA: EDB-96:025814; SN: 96001517609
Patent Number(s):
US 5,477,088/A/
Application Number:
PAN: 8-060,284
Contract Number:
AC02-83CH10093
Resource Relation:
Other Information: PBD: 19 Dec 1995
Research Org:
Midwest Research Institute; Solar Energy Research Institute; National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; COPPER SELENIDE SOLAR CELLS; DESIGN; FABRICATION; ELECTRIC CONTACTS; INDIUM SELENIDE SOLAR CELLS; GALLIUM SELENIDES; GRAIN SIZE; VAPOR DEPOSITED COATINGS; MOLYBDENUM; PHOTOVOLTAIC CONVERSION; ENERGY EFFICIENCY

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