HETEROJUNCTION SOLAR CELLS

Award Information
Agency: Department of Energy
Branch: N/A
Contract: N/A
Agency Tracking Number: 1254
Amount: $50,000.00
Phase: Phase I
Program: SBIR
Awards Year: 1984
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
Poly Solar Inc.
2701 National Drive, Garland, TX, 75041
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 CHUNG P. CHIEN
 RESEARCH SCIENTIST
 () -
Business Contact
Phone: () -
Research Institution
N/A
Abstract
THE USE OF THIN POLYCRYSTALLINE FILMS OF DIRECT GAP SEMICONDUCTORS WITH ENERGY GAP IN THE RANGE OF 1.3-1.7 EV ON A SUITABLE SUBSTRATE IS BELIVED TO BE MOST PROMISING FOR THE FABRICATION OF LOW-COST SOLAR CELLS FOR TERRESTRIAL APPLICATIONS. BECAUSE OF THE DIFFICULTY OF OBTAINING SHALLOW HOMOJUNCTIONS WITH LOW SHEET RESISTANCE SURFACE LAYER IN MANY DIRECT GAP SEMICONDUCTORS, HETEROJUNCTION STRUCTURES ARE USED. THE HETEROJUNCTION PARTNER IS USUALLY A LARGE BAND GAP SEMICONDUCTOR WITH HIGH ELECTRICAL CONDUCTIVITY (THE WINDOW MATERIAL), SUCH AS CADMIUM SULFIDE, INDIUM TIN OXIDE, ZINC OXIDE, ETC. HETEROJUNCTION THIN FILM SOLAR CELLS, SUCH AS CADMIUM SULFIDE/COPPER INDIUM SELENIDE AND CADMIUM SULFIDE/CADMIUM TELLURIDE, WITH AML EFFICIENCIES HIGHER THAN 10% HAVE BEEN OBTAINED. ALL WINDOW MATERIALS ARE OF N-TYPE CONDUCTIVITY DUE TO NON-STOICHIOMETRY (ANION VACANCIES ARE DONORS) OR THE INTRODUCTION OF DOPANTS, THUS LIMITING THE SOLAR CELLS TO THE N(+)-WINDOW MATERIAL/P-TYPE SEMICONDUCTOR CONFIGURATION. SINCE THE USE OF AN N-TYPE SEMI-CONDUCTOR FILM IS MORE DESIRABLE DUE TO ITS SURFACE STABILITY AND THE EASE OF CONTACT FORMATION, P-TYPE WINDOW MATERIALS MUST BE DEVELOPED. THE OBJECTIVE OF THIS PROPOSAL IS TO DEVELOP P-TYPE WINDOW MATERIALS FOR HETEROJUNCTION SOLAR CELLS BY PLASMA ENHANCED CHEMICAL VAPOR DEPOSITION TECHNIQUE. BORON DOPED SILICON NITRIDE FILMS AND BORON-DOPED SILICON CARBIDE FILMS WILL BE DEPOSITED ON GLASS SUBSTRATES AT TEMPERATURES UP TO 300 DEGREES C. THE PROCESS PARAMETERS, PARTICULARLY COMPOSITION AND FLOW RATE OF THE REACTION MIXTURE AND RF POWER, WILL BE VARIED OVER A WIDE RANGE TO DETERMINE THEIR AFFECTS ON THE STRUCTURAL, OPTICAL, AND ELECTRICAL PROPERTIES OF DEPOSITED FILMS. THE STRUCTURAL, OPTICAL, AND ELECTRICAL PROPERTIES WILL BE MEASURED BY THE LOW-ANGLE LAUE SPECTROPHOTOMETRIC, AND POTENTIAL PROBE TECHNIQUES, RESPECTIVELY. THE FEASIBILITY OF PRODUCING P-TYPE WINDOW MATERIAL FOR HETEROJUNCTION THIN FILM SOLAR CELLS CAN THUS BE DETERMINED.

* information listed above is at the time of submission.

Agency Micro-sites

SBA logo
Department of Agriculture logo
Department of Commerce logo
Department of Defense logo
Department of Education logo
Department of Energy logo
Department of Health and Human Services logo
Department of Homeland Security logo
Department of Transportation logo
Environmental Protection Agency logo
National Aeronautics and Space Administration logo
National Science Foundation logo
US Flag An Official Website of the United States Government