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0.82, Jsc = 18.61 mA/cm2, fill factor = 66.8%, and total-area efficiency = 10.2%. Solar cells were fabricated at IEC using the structure glass/Mo/Cu(InGa)(SeS)2/CdS/ZnO/ITO with Ni-Al collection grids and total area, defined by mechanical scribes, of 0.47–0.51 cm2. The best cell from one run had an efficiency = 10.9% with Voc = 0.826 V, Jsc = 20.4 mA/cm2, and fill factor = 64.5. 3.3 III-V Multijunction Concentrators • Optimized MBE-grown GaInNAs cell and evaluated future options for this approach. (09/04), MYTP: Task 1 of Section 4.1.2 • Demonstrated a 37.3%-efficient III-V multijunction cell under concentration. (09/04), MYTP: Task 1 of Section 4.1.2 The III-V Multijunction Concentrator Group at NREL has focused on the addition of a 1-eV GaInAsN junction to a GaInP/GaAs/Ge cell. This structure has the potential of reaching efficiencies in the 35%–40% range. Evaluation has taken place for the assessment of the viability of GaInNAs. Boeing Spectrolab achieved a record efficiency of 37.3% for a 3-junction terrestrial concentrator cell, which is the highest NREL-confirmed efficiency yet measured for a PV device. This record used 3-junction GaInP/GaInAs/Ge concentrator solar cells grown on a Ge substrate incorporating epitaxial device features to optimize their performance under the concentrated terrestrial spectrum. The device was processed at Boeing Spectrolab. Amonix has been working toward the design of a greater than 33%-efficient high-concentration module. Recently, the company completed a prototype package for testing, including a sun shield, sun shield base, substrate, diode, and multijunction cell. 4. Planned FY 2005 Activities The planned activities directly support the Solar Program’s MYTP under Tasks 1, sections 4.1.1.5 and 4.1.2.5. Implementation efforts under the project are expected to be a result of the subcontracts and in-house R&D under the FY 2005 activities. • Continue awards under “Exploring and Accelerating Pathways towards High- Performance PV: Phase I-B” though FY 2006. • Demonstrate 14%-efficient polycrystalline thin-film tandem. • Demonstrate a 38%-efficient III-V multijunction cell under concentration. • Address the operating issues assessed for high-efficiency multijunction cells under a Fresnel lens. • Begin implementation efforts of Phase II, High Performance PV, addressing critical cell and receiver components. 5. Major FY 2004 Publications M. Symko-Davies, “Progress in High Performance PV: Polycrystalline Thin Film Tandems,” International PVSEC-19, Paris, France, 2004. R. McConnell, L. Ji, J. Lasich, and R. Mansfield, Concentrator Photovoltaic Qualification Standards for Systems Using Refractive and Reflective Optics,” International PVSEC-19, Paris, France, 2004. M. Symko-Davies, Rommel Noufi, S. Kurtz, and T. Coutts, National Renewable Energy Laboratory. “High Performance PV: Exploring and Accelerating Ultimate Pathways,” presented in Italy Nov. 2003. R. McConnell, Solar Concentrator International Conference CD, Alice Springs, Australia, 2004. M. Symko-Davies, High-Performance PV Review Meeting CD, Denver, Nov. 2004.PDF Image | FY 2004 ANNUAL REPORT DOE Solar
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