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1. Introduction The HiPerf PV Project aims to explore the ultimate performance of PV technologies, approximately doubling their sunlight-to-electricity conversion efficiencies during its course. 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. Categories within the HiPerf PV Project are: (1) subcontracted research in polycrystalline thin-film tandems; (2) subcontracted research in III-V multijunction concentrators; (3) subcontracted Future Generation research; (4) high-efficiency novel concepts conducted by NREL’s in-house Basic Sciences Center, and (5) the Minority University Research Associates (MURA) task. Near-term milestones for the R&D tasks under the project follow and are listed in the DOE Solar Program Multi-Year Technical Plan (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. This development of R&D will lead the pathway toward new record cell efficiencies and commercial prototype products. For concentrating photovoltaics (CPV), gaining a position in the marketplace could portend the emergence of CPV systems in the next 2–5 years at installed system costs of $3 per watt. 2. Technical Approach The project consists of three phases for the polycrystalline thin-film tandems and III-V multijunction concentrators, which focus on a specific approach to solving the challenges associated with high efficiencies. The first phase is critical as it provides a means to accelerate toward the most promising paths for implementation, followed by commercial-prototype products. Sixteen groups, selected competitively, for HiPerf PV Phase IB, “Accelerating and Exploring Ultimate Pathways,” will be ending in FY 2006 (see section 6 below). The Future Generation Project funds in-house and university teams developing high-risk innovative Photovoltaic R&D Fundamental Research concepts (such as organic solar cells and novel solar conversion processes) with the potential for ultra-high efficiency (>50%) and very low cost. These tasks are well leveraged by related science supported by DOE’s Office of Science, Basic EnergySciences. The MURA task provides scientific and technical research opportunities for minority undergraduate students to work on various solar energy technology projects. Task Title FY 2005 Budget ($K) High-Performance PV 900 Management Technical Coordination 340 Thin-Film Polycrystalline Tandems III-V Multijunction Concentrators Future Generation Project 700 MURA 390 1,100 1,400 High-Efficiency Concepts 3. Results and Accomplishments 1,400 28 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 developing plans for the implementation phase. (09/05) MYTP: Task 1 of Section 4.1.2 The subcontracts under the Polycrystalline Thin- Film Tandems and the III-V Multijunction Concentrators are aimed toward exploring and accelerating issues that will lead into the implementation phase. This implementation phase is expected to occur 01/31/06. The Future Generation subcontracts have been awarded and will be funded for 3 years. MURA subcontracts have been awarded and will be funded for 3 years. 3.2 Thin-Film Polycrystalline Tandems • Demonstrated 14%-efficient polycrystalline thin-film tandem. (11/05) MYTP: Task 1 of Section 4.1.1.5 The NREL Polycrystalline Thin-Film Group recently demonstrated a four-terminal polycrystalline thin-film tandem cell consisting of a CdTe-based top cell and a CIS-based bottom cell, officially measured at NREL with efficiency of 15.3%. The top CdTe-based cell structure is: Corningglass/Cdstannate/Znstannate/CdS:O/CdTPDF Image | DOE Solar Energy Technologies Program
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