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Measurements and Characterization Performing Organization: National Renewable Energy Laboratory (NREL) Key Technical Contact: Peter Sheldon, 303-384-6533, peter_sheldon@nrel.gov DOE HQ Technology Manager: Jeffrey Mazer, 202-586-2455, jeffrey.mazer@ee.doe.gov FY 2005 Budget: $6,895K ____________________________________________________________________________ Objectives • Provide routine and specialized measurement and characterization support for PV program research and industry teams. • Lead and contribute to collaborative research that addresses critical issues in PV technologies. • Develop and implement novel measurement techniques that enhance the ability to understand and advance fundamental PV research and development. • Develop diagnostic tools that advance manufacturing research and development. Accomplishments • Provided measurement support in the areas of analytical microscopy, surface analysis, electro- optical characterization, and cell and module performance to more than 70 PV research partners in industry, academia, and NREL. • Expanded our ISO 17025 accreditation from secondary reference cells to include primary reference cells and modules. • Carried out detailed investigation of the structural, chemical, and electrical properties of the crystalline Si/amorphous Si interface in HIT cells. • Organized the 15th Workshop on Crystalline Silicon Solar Cell Materials and Processes. • Investigated surfactant-assisted growth of CdS thin films, leading to a substantial improvement of thin-CdS/CIGS device performance. • Developed, constructed, and tested an automated resonant-coupled, photoconductive decay (RCPCD) minority-carrier lifetime mapping system (one- or two-dimensional) that incorporates auto-tuning, and is capable of accepting samples up to 6” in diameter. • Studied plasma surface modification of polymer backsheets to investigate the origin of interfacial barrier/backsheet failure. • Developed a prototype minority-carrier lifetime measurement system capable of accurately measuring both crystalline and multicrystalline Si wafers in an in-line manufacturing environment. • Developed a scanning tunneling microscope within a scanning electron microscope (SEM) and investigated the transport properties of grain boundaries in polycrystalline thin films. • Investigated the nature, origin, and generation mechanism of defects in lattice-matched and lattice-mismatched III-V structures. • Completed a secondary ion mass spectrometry (SIMS) study of elemental diffusion during solid- phase crystallization of amorphous silicon films. • Completed international module intercomparison involving PV module calibration and certification laboratories. Future Directions • Provide measurement support in the areas of analytical microscopy, cell and module performance, electro-optical characterization, and surface analysis to at least 70 PV research partners in industry, academia, and NREL. • Maintain ISO accreditation for secondary cell and module measurements. Complete periodic audits. • Organize the 16th Workshop on Crystalline Silicon Solar Cells Materials and Processes. Photovoltaic R&D Fundamental Research 4PDF Image | DOE Solar Energy Technologies Program
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