Accession Number : ADA329441

Title :   Use of Ballistic-Electron-Emission Microscopy to Study Mechanisms for Long Wavelength Schottky-Barrier Infrared Detectors.

Descriptive Note : Final technical rept. Jun 93-Jun 96,

Corporate Author : RENSSELAER POLYTECHNIC INST TROY NY

Personal Author(s) : Schowalter, Leo J.

PDF Url : ADA329441

Report Date : JUL 1997

Pagination or Media Count : 48

Abstract : In this final report, we have summarized our work in five areas. The first area, covered in Sec. I, is the development of calcium fluoride tunnel barriers which may be used to increase the operating temperature of PtSi SBIRDs. In particular, we have demonstrated a new technique for growth of exactly two monolayers of CaF2 on Si(l 11) substrates. In Sec. II, we describe our work with ballistic electron emission microscopy to determine electron scattering processing in thin metal layers and at metaliSi interfaces. During this contract, we constructed an in-situ STM/BEEM system which allowed us to make measurements directly on PtSi and Pt surfaces without having to protect these surfaces from oxidation. Our preliminary results with this instrument are described in Sec. III. Sec. IV describes the theoretical model we have developed which explains why the Fowler-like behavior typically observed in the photoresponse for many Schottky-barrier metal/semiconductor interfaces does not prove that crystal momentum parallel to the interface is conserved. In Sec. V, we describe the Monte-Carlo program that we have developed to model ballistic electron scattering in this metal layers and across the metal/semiconductor interface. Initial results demonstrate that electron (or hole) scattering at the metal/semiconductor interface may, in fact, be the dominant transmission mechanism for most (nonpitaxial) metal/semiconductor systems.

Descriptors :   *ELECTRON MICROSCOPY, *ELECTRON EMISSION, *INFRARED DETECTORS, *SCHOTTKY BARRIER DEVICES, MATHEMATICAL MODELS, TEMPERATURE, INTERFACES, PROCESSING, ELECTRON SCATTERING, CRYSTALS, SEMICONDUCTORS, TRANSMITTANCE, CALCIUM FLUORIDES.

Subject Categories : Electrical and Electronic Equipment
      Test Facilities, Equipment and Methods
      Nuclear Physics & Elementary Particle Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE