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  • Chemistry and Materials (General)  (2)
  • MOCVD  (1)
  • 1
    ISSN: 1057-9257
    Keywords: precursors ; photovoltaics ; MOCVD ; semiconductors ; superconductors ; metastable ; quantum dots ; nanocrystalline ; crystal growth ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Molecular-precursor chemistry provides an essential underpinning to all electronic materials technologies, including photovoltaics and related areas of direct interest to energy capture and conversion. Materials synthesis and processing is a rapidly developing field in which advances in molecular precursors are playing a major role. This article surveys selected recent research examples that define the exciting current directions in molecular precursor science. These directions include growth of increasingly complex structures and stoichiometries, surface-selective growth, kinetic growth of metastable materials, growth of size-controlled quantum dots and quantum dot arrays and growth at progressively lower temperatures. Continued progress in molecular precursor chemistry will afford precise control over the crystal structures, nanostructures and microstructures of electronic materials.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2018-06-05
    Description: The key to achieving high specific power (watts per kilogram) space solar arrays is the development of a high-efficiency, thin-film solar cell that can be fabricated directly on a flexible, lightweight, space-qualified durable substrate such as Kapton (DuPont) or other polyimide or suitable polymer film. Cell efficiencies approaching 20 percent at AM0 (air mass zero) are required. Current thin-film cell fabrication approaches are limited by either (1) the ultimate efficiency that can be achieved with the device material and structure or (2) the requirement for high-temperature deposition processes that are incompatible with all presently known flexible polyimide or other polymer substrate materials. Cell fabrication processes must be developed that will produce high-efficiency cells at temperatures below 400 degrees Celsius, and preferably below 300 degress Celsius to minimize the problems associated with the difference between the coefficients of thermal expansion of the substrate and thin-film solar cell and/or the decomposition of the substrate.
    Keywords: Chemistry and Materials (General)
    Type: Research and Technology 1999; NASA/TM-2000-209639
    Format: application/pdf
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  • 3
    Publication Date: 2019-07-10
    Description: The development of thin film solar cells on flexible, lightweight, space-qualified substrates provides an attractive cost solution to fabricating solar arrays with high specific power, (W/kg). The use of a polycrystalline chalcopyrite absorber layer for thin film solar cells is considered as the next generation photovoltaic devices. At NASA GRC we have focused on the development of new single source precursors (SSP) and their utility to deposit the chalcopyrite semi-conducting layer (CIS) onto flexible substrates for solar cell fabrication. The syntheses and thermal modulation of SSPs via molecular engineering is described. Thin-film fabrication studies demonstrate the SSPs can be used in a spray CVD (chemical vapor deposition) process, for depositing CIS at reduced temperatures, which display good electrical properties, suitable for PV (photovoltaic) devices.
    Keywords: Chemistry and Materials (General)
    Type: NASA/TM-2002-211496 , NAS 1.15:211496 , E-13264
    Format: application/pdf
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