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Investigation of the effects of gamma-ray irradiation on electrical characteristics of MOS capacitors

H. M. BARAN1, A. TATAROĞLU1,* , R. ERTUĞRUL1

Affiliation

  1. Physics Department, Faculty of Sciences, Gazi University, 06500, Teknikokullar, Ankara, Turkey

Abstract

The effects of gamma(γ)-ray irradiation on the electrical characteristics of metal-oxide-semiconductor (MOS) capacitors were investigated. The MOS capacitor was exposed to a 60Co γ-radiation source with a dose rate of 0.69 kGy/h and was irradiated with gamma rays at doses up to 100 kGy. Capacitance-voltage (C-V) and conductance-voltage (G/ω-V) characteristics were analyzed before and after exposure to gamma irradiation at high frequency (1 MHz) and room temperature. These characteristics of the gamma irradiated capacitor have shown the changes in the capacitance and conductance values, respectively with gamma irradiation dose. A decrease in the C and G/ω was observed when the irradiation dose increased. Also, the capacitance and conductance curves measured at 100 kGy were corrected to decrease the effects of the series resistance (Rs). Furthermore, the values of interface states (Nss) were determined using Hill-Coleman method. The Nss decreases with the increasing radiation dose..

Keywords

Radiation effects; Gamma rays; Electrical properties; Series resistance; Interface states.

Submitted at: Feb. 29, 2012
Accepted at: April 11, 2012

Citation

H. M. BARAN, A. TATAROĞLU, R. ERTUĞRUL, Investigation of the effects of gamma-ray irradiation on electrical characteristics of MOS capacitors, Journal of Optoelectronics and Advanced Materials Vol. 14, Iss. 3-4, pp. 304-308 (2012)