25x Space Fresnel Lens Concentrator Using 4(+) Junction IMM Solar Cells and Nyctinastic Graphene Radiators to Mitigate LILT Effects for Outer Planet Missions, Phase I

Metadata Updated: February 28, 2019

The innovation is a unique solar array for powering NASA's deep space missions without the low-intensity, low-temperature (LILT) problems of conventional arrays. The new array uses a robust, ultra-light, color-mixing Fresnel lens to point-focus sunlight at a 25X concentration ratio onto the most advanced 4-junction and 6-junction inverted metamorphic (IMM) photovoltaic cells. Waste heat from the cells is dissipated to space by a bio-inspired nyctinastic graphene radiator. The radiator passively folds up around the cell, like a flower at night, to reduce the drastic temperature drop in deep space, due to the reduction in solar irradiance at large distances from the sun. The 25X concentration and the high-optical-efficiency lens eliminate the low-intensity (LI) problem by maintaining an irradiance on the cell of nearly one AM0 sun at 5 AU distance from the sun. The nyctinastic radiator mitigates the low-temperature (LT) problem of conventional arrays by maintaining the cell temperature at about -100 C instead of the typical -140 C at 5 AU. This warmer cell temperature minimizes changes in band gaps for the 4 junctions or 6 junctions in the cell, thereby maintaining better current matching for the series-connected junctions. The performance metrics of the new array are unprecedented. The expensive solar cells are reduced in area and cost by 95% compared to conventional one-sun cells. The cells can be heavily shielded front and back from space radiation at very low mass penalty, due to the small cell size. The overall specific power of the lens + cell assembly + radiator is more than 1,400 W/kg for a heavily shielded cell, about 3X better than for a one-sun cell with the same shielding. The feasibility of the new array technology will be proven in Phase I by the small business (Mark O'Neill, LLC), the research institution (University of Connecticut), and the IMM cell firm (SolAero). In Phase II, fully functional hardware will be developed and delivered.

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Public: This dataset is intended for public access and use. License: U.S. Government Work

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Metadata Created Date August 1, 2018
Metadata Updated Date February 28, 2019

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Harvested from NASA Data.json

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Resource Type Dataset
Metadata Created Date August 1, 2018
Metadata Updated Date February 28, 2019
Publisher Space Technology Mission Directorate
Unique Identifier TECHPORT_93310
Maintainer Email
Public Access Level public
Bureau Code 026:00
Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
Metadata Catalog ID https://data.nasa.gov/data.json
Schema Version https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
Harvest Object Id d55129cd-7a54-4348-a612-9da23b4025cd
Harvest Source Id 39e4ad2a-47ca-4507-8258-852babd0fd99
Harvest Source Title NASA Data.json
Data First Published 2018-06-01
Homepage URL https://techport.nasa.gov/view/93310
License http://www.usa.gov/publicdomain/label/1.0/
Data Last Modified 2018-07-19
Program Code 026:027
Source Datajson Identifier True
Source Hash 966bbdb29848ddd320dc717cd07ae88b1865dd62
Source Schema Version 1.1

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