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• Continue development of wide-bandgap material, tunnel junction, and bottom cell toward a 25%- efficient tandem cell. • Demonstrate a 41% III-V multijunction solar cell incorporated into a high-concentration module. _____________________________________________________________________________________ 1. Introduction The HiPerf PV Project aims to explore the ultimate performance limits of existing PV technologies, approximately doubling their sunlight-to-electricity conversion efficiencies during its course. This work includes bringing thin-film tandem cells and modules toward 25% and 20% efficiencies, respectively, and developing multijunction pre-commercial concentrator modules able to convert more than one-third of the sun’s energy to electricity. The project is expected to enable progress of high- efficiency technologies toward commercial- prototype products. This begins with the investigations of a wide range of complex issues and provides initial modeling and baseline experiments of several advanced concepts. Near- term milestones for the polycrystalline thin-film tandems and III-V multijunction concentrator R&D under the project follow and are listed in the Solar Program’s MYTP. Throughout the project’s term, there will be opportunities to reach established program goals by both disruptive technology advances and/or multiple incremental improvements. 2. Technical Approach The project consists of three phases that focus on a specific approach to solving the challenges associated with high efficiencies. The second HiPerf PV subcontract solicitation was recently completed and allows the NCPV to provide 3 years of funding to the top-ranked companies and universities. The first phase is critical, as it provides a means to accelerating toward the most promising paths for implementation, followed by commercial-prototype products. Fourteen groups, selected competitively, were involved in negotiations for the HiPerf PV Phase IB, “Accelerating and Exploring Ultimate Pathways.” All awards have been completed and have begun activities (see section 6 below). Budget allocations by task for the HiPerf PV Project are shown below. Task Title High-Performance PV Management Thin-Film Polycrystalline Tandems III-V Multijunction Concentrators 3. Results and Accomplishments FY 2004 Budget ($K) 400 1,050 1,350 All results reflect an MYTP milestone and will be discussed after the milestone is stated. 3.1 High-Performance PV Management • Assessed research on exploring pathways to high-efficiency PV and developed plans for the Implementation Phase. (09/04), MYTP: Task 1 of Section 4.1.2 Completed all awards (14) under the new solicitation: “Exploring and Accelerating Pathways towards High-Performance PV: Phase I- B.” Award length is for 3 years with a maximum amount of $300K/year. These subcontracts are exploring and accelerating issues that will lead into the implementation phase. 3.2 Thin-Film Polycrystalline Tandems • Identified device design in terms of monolithic/mechanical structure, as well as various bandgap combinations. (09/04), MYTP: Task 1 of Section 4.1.1.5. It was found that there are benefits to a monolithic and/or monolithic approach, and that both designs would be pursued in parallel. Subcontractors, as well as internal NREL researchers, are addressing both approaches. Focus remains on the wide- bandgap material of the tandem cell. The Polycrystalline Thin-Film PV Group at NREL has demonstrated that a surface-modified CGS top cell exhibits the following NREL- confirmed device operating parameters: Voc =PDF Image | FY 2004 ANNUAL REPORT DOE Solar
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