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bandgaps. The approach involves inverted, lattice- mismatched heterostructures that can contain two to five (or possibly more) subcells (i.e., absorber • bandgaps). The inverted structures allow the monolithic integration of high-, medium-, and low- bandgap materials through the use of transparent compositionally graded layers. NREL High-Efficiency Concepts Group Principal Investigator Arthur Frank Arthur Nozik Angelo Mascarenhas Su-Huai Wei Alex Zunger 3.5 Minority University Research Associates Continuation of awards from the RFPs of fall 2003 • includes eight minority-serving universities (six HBCUs and two Hispanic-serving universities). Accomplishments include: identification and integration of a software tool for the design and • analysis of solar concentrating systems; • development and implementation of simulation tools for analysis of solar concentrating systems • (University of Texas at Brownsville); and fabrication of ZnO thin film and nanorods, TiO2 thin Generation subcontracts will continue as planned. MURA subcontracts will continue as planned. Finalization of subcontracts under "Exploring and Accelerating Pathways towards High Performance PV: Phase I-B" through FY 2006/2007. Begin Implementation efforts and solicitation for letters of interest to be issued. This will be based on the stage-gate process. Complete an award under this Implementation Title/Research Activity phase by January, 2007. • Demonstrate 15%-efficient polycrystalline thin- Dye Cell Research film tandem. Quantum Dots • Demonstrate a 40%-efficient III-V multijunction Solid State Spectroscopy cell under concentration. • Continue modeling of the enhanced Computational Materials performance of quantum-dot-based solar cells Science Solid State Theory ial configurations to see how far one can push the MEG effect in various PV cell configurations to maximize cell efficiency. Continue studies of properties and determine dopability of wide-gap top cell candidate materials, including CuGaSe2 and related compounds. Target 10% efficiency for organic solar cells. Continue R&D of ultra-high efficiency solar cells targeting >50% efficiency. MURA: Ensure progress on projects currently under way and invite additional universities to participate in the REAP Conference through partnerships with other similar programs. film and nanorods, and the development of highly transparent and durable nanolayer polymer substrate in collaboration with Case Western Reserve University. The Renewable Energy Academic Partnership (REAP) Review Meeting was held August 7–10, 2005, in conjunction with the Crystalline Silicon Workshop in Vail, CO. Presentations generated interesting discussions, which demonstrated great enthusiasm by participants towards the individual projects. The DOE NREL MURA Program is receiving worldwide recognition for its unique efforts. The MURA effort produced 43 publications during the year. 4. Planned FY 2006 Activities The planned activities directly support the MYTP under Task 1, sections 4.1.1.5 and 4.1.2.5. Next-phase implementation efforts in the area of Polycrystalline Thin-Film Tandems and III-V Multijunction Concentrators are expected to result from the subcontracts and in-house R&D under the FY 2005 activities. The stage-gate process will provide go/no-go decisions. The Future Photovoltaic R&D Fundamental Research 5. Major FY 2005 Publications R. McConnell, M. Symko-Davies, S. Kurtz, “Concentrator Photovoltaic Technologies,” ISES Refocus Magazine, July/August (2005). R. McConnell, M. Symko-Davies, “DOE High Performance Concentrator PV Project,” International Solar Concentrator Conference, (2005). M. Symko-Davies, “High Performance PV Future: Polycrystalline Thin-Film Tandems” (presentation and paper), 20th European PV Solar Energy Conference and Exhibition, Barcelona, Spain, June 2005. McConnell, R., Symko-Davies, M., S. Kurtz, PV FAQs. “What’s New in Concentrating PV?” U.S. Department of Energy, EERE, NREL Report No. CD-520-35349. R.D. McConnell and M. Symko-Davies, “High- Performance PV Future: III-V Multijunction 30PDF Image | DOE Solar Energy Technologies Program
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