Tailored Microstructures for Broadband or Selective Detection of Radiation from the Visible to the Infrared.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 25, 1994
- Accession Number
- ADA292097
Entities
People
- Clayton W. Bates Jr.
Organizations
- Stanford University