Electrical characterization of grain boundaries in GaAs
Grain-boundary capacitance versus voltage, current versus voltage, and capacitance transient measurements are reported on lightly doped n-type GaAs bicrystals. The measurements are analyzed in terms of the abrupt depletion edge model in which the dominant current mechanism across the potential barrier formed by trapped charge at the interface is thermionic emission. The steady-state measurements are completely consistent with this model and provide grain-boundary parameters (barrier height, net carrier concentration in adjacent grains, and interface charge) necessary for interpreting capacitance transient measurements. The latter, made on a bicrystal specially selected for uniformity of the grain-boundary barrier, reveal the presence of two closely spaced levels at 0.62 and 0.74 eV below the conduction band edge. The capture cross section associated with the dominant lower level is measured directly by two methods and falls in the range 10/sup -14/--10/sup -13/ cm/sup 2/.
- Research Organization:
- Department of Electrical Engineering, Howard University, Washington, D.C. 20001
- OSTI ID:
- 6337647
- Journal Information:
- J. Appl. Phys.; (United States), Vol. 54:3
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GALLIUM ARSENIDES
ELECTRICAL PROPERTIES
GRAIN BOUNDARIES
BICRYSTALS
CARRIER DENSITY
CHROMIUM
CROSS SECTIONS
DOPED MATERIALS
ELECTRIC CHARGES
ENERGY LEVELS
EXPERIMENTAL DATA
INTERFACES
N-TYPE CONDUCTORS
POTENTIALS
STEADY-STATE CONDITIONS
THERMIONIC EMISSION
TRANSIENTS
TRAPS
ARSENIC COMPOUNDS
ARSENIDES
CRYSTAL STRUCTURE
CRYSTALS
DATA
ELEMENTS
EMISSION
GALLIUM COMPOUNDS
INFORMATION
MATERIALS
METALS
MICROSTRUCTURE
NUMERICAL DATA
PHYSICAL PROPERTIES
PNICTIDES
POLYCRYSTALS
SEMICONDUCTOR MATERIALS
TRANSITION ELEMENTS
360603* - Materials- Properties