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High Performance PV Project releases solicitation for Letters of Interest (LOI) No. RAT-3-33624 Phase IB: "High Performance PV-Exploring and Accelerating Ultimate Pathways"
http://www.nrel.gov/contracts/solicitations.html
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The U.S. Department of Energy (DOE) High-Performance PV Project calls for a 33% concentrator module and a 40% concentrator cell to be developed. Recent work has shown that the ASTM direct reference spectrum is not representative of sunny conditions in regions with a high annual direct-normal energy (>6 kWh/m2/day) where concentrators might be deployed (the Sun Belt). The primary reason for this is the low average aerosol optical depth of 0.085 at 500 nm in the sun belt is much lower than the 0.27 value in the ASTM terrestrial reference spectra. In the past, this issue did not matter because at a given total irradiance and cell temperature under direct, global, or clear-sky natural sunlight, concentrator PV cells or modules produced the same short-circuit current within ±2%. The reason stems from the fact that in the past, the only concentrator cells were single-junction Si, GaAs, or independently measured multijunction cells that have a small spectra sensitivity. In contrast, the short-circuit current of the series-connected GaInP/GaAs/ Ge triple-junction cells are much more sensitive to spectral variations. These issues and the model that generated the data are discussed in detail in the following references:
Keith Emery, Daryl Myers, and Sarah Kurtz, "What is the Appropriate Reference Spectrum for Characterizing Concentrator Cells?," Proc. 29th IEEE Photovoltaic Specialists Conf., New Orleans, LA, May 20-24, 2002, pp. 840-843, IEEE, New York, 2002.
D.R. Myers, K. Emery, C. Gueymard, "Terrestrial Solar Spectral Modeling Tools and Applications for Photovoltaic Devices," Proc. 29th IEEE Photovoltaic Specialists Conf., New Orleans, LA, May 20-24, 2002, pp. 1683-1686, IEEE, New York, 2002.
D.R. Myers, K. Emery, C. Gueymard, "Proposed Reference Spectral Irradiance Standards to Improve Concentrating Photovoltaic System Design and Performance Evaluation," Proc. 29th IEEE Photovoltaic Specialists Conf., New Orleans, LA, May 20-24, 2002, pp. 923-926, IEEE, New York, 2002.
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