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M. Codes,standards,andcertificationactivitieswillbeundertakentosupportthe development of qualification and test standards, because these are the ones critical to market entry of a new technology. 4.1.2.4 Technology Approach and Tasks The technology approach is to improve efficiency, lower cost, and ensure long-term reliability of future CPV systems through the following tasks. Tasks listed below with dates are taken from the recently revised five-year photovoltaics plan milestone schedule and can be considered as part of the FY 2003 Solar Program. Note that the majority of the CPV tasks funded by the FY 2003 Solar Program budget support CPV cell research and development. Task 1 Table 4.1.2-2. Tasks for CPV Technology R&D Title Barriers CPV Cell Research and Development • “Keep the door open” for the exploration and development of a third- A generation solar cell approach for efficiencies approaching 60%. Select university research teams for third-generation PV technologies targeting very high efficiency and very low cost. A A A A A C A A • Evaluate optimized cell grown by molecular-beam epitaxy to assess the viability of GaInNAs for multijunction cells. • Assess research on exploring pathways to high-efficiency PV and develop plans for implementation phase. • Begin implementation efforts of Phase II, addressing cell materials, design, and receiver components for High-Performance PV. 2 carrier and impact-ionization concepts. • Demonstrate 39% cell efficiency under concentration. • Investigate methods to increase efficiency and reduce cell cost through film transfer, wafer bonding, or buffer layer. • Develop testing protocol for III-V solar cells under concentration. • Assess implementation efforts of Phase II, leading to the initiation of Phase III of High-Performance PV implementing CPV advances. CPV Receiver Research and Development • Demonstrate 37% cell efficiency under concentration. • Demonstrate the feasibility of third-generation PV devices such as hot- A • Assess R&D needs for CPV optical elements. D • Assess issues of operating a high-efficiency multijunction cell under a high-concentration Fresnel lens. • Test high-efficiency (35%) concentrator cell receiver in concentrating- solar-power dish system. • Assess need to develop integrated receiver packaging to resolve issues of thermal management, flux uniformity, and cell protection. • Develop international qualification standard for CPV receivers with III-V solar cells. • Address the operating issues assessed for high-efficiency multijunction cells under a Fresnel lens. E E E F E Solar Energy Technologies Program Multi-Year Technical Plan 74PDF Image | Solar Energy Technologies Program
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