InP:Fe and GaAs:Cr picosecond photoconductive radiation detectors. Master's thesis
The dark-current, impulse, and square-pulse response measurements of photoconductive devices fabricated from two different types of materials, gallium arsenide with chromium dopant (GaAs:r) and indium phosphide with iron dopant (InP:Fe) are reported. These devices have been subjected to irradiation from the S-band electron linear accelerator (LINAC) with an energy fo 100 MeV at room temperature. Fluence ranged between 10/sup 13/ and 10/sup 16/ electrons/sq cm. Dark/current decreases with increasing fluence for the GaAs:Cr devices whereas InP:Fe shows an increase in the dark current. Both types of materials exhibit extremely fast impulse response after the irradiation. Electron mobility, drift velocity, and response speed decrease with increasing fluence. Response speeds of < 100 ps are achieved by fast-carrier relaxation in the semiconductor due to the introduction of trapping and recombination centers resulting from the irradiation damage. The GaAs:Cr, unlike the InP:Fe, more closely follows the longer square-pulse exhibiting non nonlinearity. All results are consistent with previously investigated neutron irradiated devices.
- Research Organization:
- Naval Postgraduate School, Monterey, CA (USA)
- OSTI ID:
- 5889513
- Report Number(s):
- AD-A-164413/7/XAB
- Country of Publication:
- United States
- Language:
- English
Similar Records
Development and Testing of Gallium Arsenide Photoconductive Detectors for Ultra Fast, High Dose Rate Pulsed Electron and Bremsstrahlung Radiation Measurements
InP:Fe picosecond photoconductors
Related Subjects
GALLIUM ARSENIDES
PHYSICAL RADIATION EFFECTS
INDIUM PHOSPHIDES
PHOTODETECTORS
CHROMIUM
DAMAGE
ELECTRON MOBILITY
IRON
IRRADIATION
PHOTOCONDUCTIVITY
PULSES
RELAXATION
ARSENIC COMPOUNDS
ARSENIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
GALLIUM COMPOUNDS
INDIUM COMPOUNDS
METALS
MOBILITY
PARTICLE MOBILITY
PHOSPHIDES
PHOSPHORUS COMPOUNDS
PHYSICAL PROPERTIES
PNICTIDES
RADIATION EFFECTS
TRANSITION ELEMENTS
440200* - Radiation Effects on Instrument Components
Instruments
or Electronic Systems
440101 - Radiation Instrumentation- General Detectors or Monitors & Radiometric Instruments