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High-Performance Photovoltaics Performing Organization: National Renewable Energy Laboratory (NREL) Key Technical Contact: Martha Symko-Davies, 303-384-6528, martha_symko_davies@nrel.gov DOE HQ Technology Manager: Jeffrey Mazer, 202-586-2455, jeffrey.mazer@ee.doe.gov FY 2005 Budget: $6,230K ____________________________________________________________________________________ Objectives The High-Performance Photovoltaics (HiPerf PV) Project aims to explore the ultimate performance limits of PV technologies, approximately doubling their sunlight-to-electricity conversion efficiencies during its course. This work includes developing: • Thin-film tandem cells and modules toward 25% and 20% efficiencies • Multijunction precommercial concentrator modules able to convert more than one-third of the sun’s energy to electricity. • High-risk/high-payoff third-generation PV technologies, primarily high-efficiency and exciton- based solar cells, aimed at substantially surpassing the performance of existing solar cell technologies • Scientific and technical research opportunities for minority undergraduate and graduate students in solar energy technologies via the Minority University Research Associates project. Accomplishments • The NREL polycrystalline group demonstrated a four-terminal polycrystalline thin-film tandem cell consisting of a CdTe-based top cell and a CIS-based bottom cell, officially measured by NREL at 15.3% efficiency. • The Institute of Energy Conversion (IEC) demonstrated an 11.9% CIGSS (1.5eV) top cell material of the polycrystalline thin-film tandem. • Boeing Spectrolab demonstrated a 39%-efficient GaInP/GaInAs/Ge cell that was verified by NREL at 236 suns. • NREL demonstrated a 37.9%-efficient inverted GaInP/GaAs/GaInAs tandem structure. • Concentrating Technologies demonstrated a concentrator system using III-V multijunction solar cells. • Quantum yields of up to 300% (three electron-hole pairs per photon) have been measured in PbSe and PbS quantum dots at photon energies four times the quantum dot bandgap. • Princeton discovered a new material Ru(acac)3 that is useful as an exciton-blocking layer in organic PV cells. Future Directions The project will continue to address key R&D issues in supporting the next phase, “Implementation of Pathways,” in late FY 2006. • Continue development of wide-bandgap material, tunnel junction, and bottom cell toward a 25%- efficient polycrystalline thin-film tandem cell. • Demonstrate a 40% III-V multijunction solar cell incorporated into a high-concentration module. • Design approaches for fabricating solar cells with >50% efficiency, in quantity, in 5 years. ___________________________________________________________________________________ Photovoltaic R&D 27 Fundamental ResearchPDF Image | DOE Solar Energy Technologies Program
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