Accession Number : ADA292097

Title :   Tailored Microstructures for Broadband or Selective Detection of Radiation from the Visible to the Infrared.

Descriptive Note : Final technical rept. 1 Jan 86-31 Dec 92,

Corporate Author : STANFORD UNIV CA DEPT OF MATERIALS SCIENCE AND ENGINEERING

Personal Author(s) : Bates, Clayton W., Jr

PDF Url : ADA292097

Report Date : 25 AUG 1994

Pagination or Media Count : 152

Abstract : The primary objectives of this project were to prepare and measure the optical and electrical transport properties of metal-semiconductor inhomogeneous composite systems for possible optoelectronic applications. The systems investigated were Ag-O-Cs, Ag-Si and Ag, Au-CuInSe2, where the metal particles were dispersed throughout the semiconductor matrices in sizes ranging from about 5nm to lOOnm. The approach was to relate the microstructure, i.e., the metal size distribution, volume fraction and optical properties of metal and matrix to the optical and electrical transport properties of the composite system. For this purpose a complete, self-consistent electromagnetic theory was developed which accounted very accurately for experimentally measured composite optical properties. It was found that the optical absorption of these systems could be varied in a known fashion suggested by the developed theory and that transport properties such as the mobility of carriers was not compromised by the large volume fraction of metal in these systems. The high absorption at wavelengths determined by their microstructures makes them attractive as ultrathin elements in a variety of optoelectronic schemes. (MM)

Descriptors :   *OPTICAL PROPERTIES, *ELECTROOPTICS, *SILVER ALLOYS, *THIN FILMS, *ELECTROMAGNETIC SCATTERING, *METAL OXIDE SEMICONDUCTORS, *PHOTOELECTRIC EMISSION, METALS, MICROSTRUCTURE, COMPOSITE MATERIALS, PARTICLE SIZE, METAL COATINGS, ELECTRICAL PROPERTIES, TRANSPORT PROPERTIES, DIELECTRIC PROPERTIES, ELECTROMAGNETIC RADIATION, VISIBLE SPECTRA, PHOTONS, INFRARED RADIATION, ELECTRON DIFFRACTION, SPUTTERING, PHOTOCATHODES.

Subject Categories : Electrooptical and Optoelectronic Devices
      Electricity and Magnetism
      Optics
      Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE