Low frequency negative capacitance behavior of molecular beam epitaxial GaAs n-low temperature-i-p structure with low temperature layer grown at a low temperature


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      		Views: (2009)   Date: (Publication Date: Mar 1998)   Pages: ()

    • Author:  Chen  N. C. Wang  P. Y. Chen  J. F. Department of Electrophysics  National Chiao Tung University  Hsinchu  Taiwan  Republic of China;  

    • Abstract:  Abstract The GaAs sample under study is a n-low temperature-i-p structure grown by molecular beam epitaxy with a low-temperature (LT) layer grown at 300?°C and annealed at 620?°C for 1 h. Admittance measurements on this sample reveal a negative capacitance at low frequency. This work analyzes the origin of the negative capacitance and its corresponding frequency-dependent conductance by combining two current components: charging–discharging current and the inertial conducting current. Analysis results indicate that the activation energies and time constants of both current components closely resemble each other and should correspond to the same trap. Based on the results presented herein, we can conclude that the negative capacitance at low frequency provides evidence of a generation-recombina tion center with an activation energy of 0.77 eV in the LT layer. © 1998 American Institute of Physics.

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