Accession Number : AD0283273

Title :   INVESTIGATION OF PHYSICAL PROPERTIES OF SEMICONDUCTORS

Corporate Author : PENNSYLVANIA UNIV PHILADELPHIA

Personal Author(s) : CASPARI,MAX E.

Report Date : APR 1960

Pagination or Media Count : 1

Abstract : Research effort was devoted to the investigation of materials which may have interesting semiconducting properties at high temperatures. In particular, solid solutions and compounds of metals and tungsten trioxide were investigated. It was found that lead forms solid solutions with tungsten trioxide over a wide composition range but has metallic electrical properties. Copper tungstate and a compound containing a small amount of silver in tungsten trioxide had interesting semiconducting properties. Aluminum boride was a semiconductor with a large activation energy. Coupled with the preparation, chemical analysis and determination of electrical properties of these compounds, a crystal structure determination of triclinic copper tungstate was initiated. A study of the Faraday effect at microwave frequencies on n- and p-type germanium and silicon was carried out over a wide temperature range as a function of the static magnetic field, leading to information regarding the effective masses, life-times and mobilities of the charge carriers. (Author)

Descriptors :   *SEMICONDUCTORS, ALKALI METALS, ALUMINUM COMPOUNDS, BORIDES, CHEMICAL ANALYSIS, CHLORIDES, COPPER COMPOUNDS, CRYSTAL STRUCTURE, DIOXIDES, ELECTRICAL PROPERTIES, GERMANIUM, HIGH TEMPERATURE, IODINE, MAGNETOOPTICS, METALLIC COMPOUNDS, MICROWAVE FREQUENCY, OXIDES, PHYSICAL PROPERTIES, POTASSIUM COMPOUNDS, SILICON, SILVER, SINGLE CRYSTALS, SOLIDS, SOLUTIONS(MIXTURES), TITANIUM COMPOUNDS, TUNGSTEN COMPOUNDS

Distribution Statement : APPROVED FOR PUBLIC RELEASE