from 28 June 2015 to 3 July 2015 (Africa/Johannesburg)
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SAIP2015 Proceeding published on 17 July 2016
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Electrical characterization of 5.4 MeV alpha particle irradiated, low doped n-type Gallium Arsenide.

Presented by Mr. Shandirai TUNHUMA on 30 Jun 2015 from 16:10 to 18:00
Type: Poster Presentation
Session: Poster1
Track: Track A - Division for Physics of Condensed Matter and Materials
Board #: A.341

Abstract

Gold Schottky diodes were fabricated on n-type GaAs with a free carrier density of 1E15. The diodes had excellent rectification properties with an ideality factor of 1.03 signifying the dominance of the thermionic emission process in charge transport across the barrier. The diodes were irradiated with alpha particles up to a fluence of 2.56×〖10〗^10 〖cm〗^2. Deep level transient spectroscopy (DLTS) performed on these contacts in the 15-300K range revealed the prominent well known radiation induced defects E1-E3. Laplace deep level spectroscopy split the E3 defect into two components, revealing the metastable E3 component with an activation enthalpy of 0.38eV. Current-voltage (I-V) and Capacitance-voltage (C-V) measurements revealed degraded diode characteristics after irradiation, with the reverse saturation leakage current and the free carrier density being the most susceptible.

Award

Yes

Level

MSc

Supervisor

Mmantsae Moche Diale mmantsae.diale@up.ac.za University of Pretoria

Paper

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Permission

Yes

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