Accession Number : ADA339037
Title : Investigation of the Optical Properties of Ordered Semiconductor Materials
Descriptive Note : Doctoral thesis
Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ENGINEERING PHYSICS
Personal Author(s) : McCrae, Jack E.
PDF Url : ADA339037
Report Date : 22 JAN 1997
Pagination or Media Count : 158
Abstract : Optical Studies have been conducted upon CdGeAs2 and ZnGeP2, two of the most promising semiconductors being developed for mid-infrared non-linear optics applications. These experiments included photoluminescence (PL) studies of both compounds as well as photoreflectance (PR) measurements upon CdGeAs2. In addition, Hall effect measurements were carried out upon CdGeAs2, to aid in interpretation of the optical data. PL was measured as a function of laser power, sample temperature, and crystal orientation for CdGeAs2. One broad weak peak near 0.38 eV, and another somewhat narrower and often far brighter peak near 0.57 eV were found by low temperature (4 K) PL measurements. Strongly polarized PL was observed with the E field of the PL parallel to the material's c-axis. A polarization ratio as high as 6:1 was observed. PL on ZnGeP2 in the mid-IR revealed a previously unreported PL peak near 0.35 eV. PR measurements on CdGeAs2 allowed the estimation of the bandgap as a function of temperature. Hall effect measurements on CdGeAs2 reveals the dominant acceptor level lies about 120 meV above the valence band.
Descriptors : *OPTICAL PROPERTIES, *OPTICAL MATERIALS, *SEMICONDUCTORS, *INFRARED OPTICAL SYSTEMS, MEASUREMENT, LOW TEMPERATURE, POLARIZATION, HALL EFFECT, PHOTOLUMINESCENCE, THESES, OPTICAL DATA, CRYSTALS, NONLINEAR OPTICS, LASERS, VALENCE BANDS, ZINC, CADMIUM, ARSENIDES, PHOSPHIDES, ELECTRON ACCEPTORS, GERMANIUM.
Subject Categories : Inorganic Chemistry
Distribution Statement : APPROVED FOR PUBLIC RELEASE