FLEXIBLE, LIGHTWEIGHT AMORPHOUS SILICON SOLAR CELLS TUNED FOR AMO SPECTRUM.

Award Information
Agency:
National Aeronautics and Space Administration
Branch:
N/A
Amount:
$481,904.00
Award Year:
1991
Program:
SBIR
Phase:
Phase II
Contract:
N/A
Agency Tracking Number:
12016
Solicitation Year:
N/A
Solicitation Topic Code:
N/A
Solicitation Number:
N/A
Small Business Information
Iowa Thin Film Technologies
237 Wildflower Drive, Ames, IA, 50010
Hubzone Owned:
N
Socially and Economically Disadvantaged:
N
Woman Owned:
N
Duns:
N/A
Principal Investigator
 Frank Jeffrey
 Principal Scientist
 (515) 294-7732
Business Contact
 DERRICK GRIMMER
Title: VICE PRESIDENT
Phone: (515) 294-7732
Research Institution
N/A
Abstract
THERE IS A NEED IN SPACE POWER SYSTEM TECHNOLOGIES FOR FLEXIBLE, LIGHTWEIGHT SOLAR ARRAYS WITH SPECIFIC PERFORMANCEIN W/KG EXCEEDING BASELINE THIN SI DESIGN. A NEW TYPE OF AMORPHOUS SILICON SOLAR CELL IS PROPOSED IN WHICH THE DEVICES ARE FABRICATED AND MONOLITHICALLY INTERCONNECTED ON POLYIMIDE FILM, USING CONTINUOUS ROLL-TO-ROLL PROCESSES DDEVELOPED SPECIFICALLY FOR POLYIMIDE. THIS TECHNOLOGY, TAILORED FOR SPACE USE, WILL PROVIDE A GREAT IMPROVEMENT OVER CURRENT TECHNOLOGIES IN BOTH POWER TO WEIGHT RATIO AND COST. THE DEVICE STRUCTURE CONSISTS OF AN A-SI P-I-N DIODE DEPOSITED ON 2 MIL METALIZED POLYIMIDE. A TRANSPARENT CONDUCTOR IS DEPOSITED ON TOP OF THE DIODE STRUCTURE, GIVINGA TOTAL DEVICE THICKNESS OF LESS THAN 1 MICRON. IN PHASE I,WE PROPOSE SEVERAL INNOVATIONS TO ENSURE DEVICE STABILITY AND IMPROVEMENT OF THE DEVICE EFFICIENCY IN THE SPACE ENVIRONMENT. THESE CHANGES INVOLVE (1) MODIFYING THE TOP LAYER TO IMPROVE BLUE AND NEAR UV RESPONSES, (2) ESTABLISHING DEPOSITION PROCEDURES FOR FABRICATING TANDEM JUNCTION DEVICES WITH DIFFERENT BANDGAP A-SI I-LAYERS, AND (3) DEVELOPING A LOWER BANDGAP SIGE BOTTOM LAYER IN THE TANDEM CELL.

* information listed above is at the time of submission.

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