Accession Number : ADA326406

Title :   Mechanism of Doping Gallium Arsenide with Carbon Tetrachloride During Organometallic Vapor-Phase Epitaxy.

Descriptive Note : Technical rept. no. 6,

Corporate Author : CALIFORNIA UNIV LOS ANGELES

Personal Author(s) : Warddrip, Michael L. ; Kappers, Menno J. ; Li, Lian ; Qi, Haihua ; Han, Byung-Kwon

PDF Url : ADA326406

Report Date : 23 MAY 1997

Pagination or Media Count : 20

Abstract : The rates of decomposition of carbon tetrachloride (CCl4), triethylgallium (TEGa) and tertiarybutylarsine (TBAs), and the rate of GaAs film growth, were measured as a function of the process conditions during organometallic vapor phase epitaxy. In addition, the reaction of CC14 with the GaAs(001) surface was monitored in ultrahigh vacuum using infrared spectroscopy, temperature programmed desorption, and scanning tunneling microscopy. These experiments have revealed that CC14 adsorbs onto Ga sites, and decomposes by transferring chlorine ligands to other Ga atoms on the surface. Chlorine and gallium desorb from the surface as GaCl, while the carbon incorporates into the lattice. Triethylgallium is consumed by two competing reactions; GaAs film growth, and GaCl etching. Depending on the V/III and IV/III ratios and temperature, the etch rate can be high enough to prevent any GaAs deposition.

Descriptors :   *INFRARED SPECTROSCOPY, *GALLIUM ARSENIDES, *EPITAXIAL GROWTH, *CARBON TETRACHLORIDE, FILMS, ORGANOMETALLIC COMPOUNDS, CHEMICAL VAPOR DEPOSITION, ETCHING, LIGANDS, DOPING, DESORPTION, CHLORINE, ULTRAHIGH VACUUM.

Subject Categories : Industrial Chemistry and Chemical Processing
      Crystallography
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE