A Two-Dimension (2D) Analytical Model for the Potential Distribution and Threshold Voltage of Short-Channel Ion-Implanted GaAs MESFETs under Dark and Illuminated Conditions

作者：Tripathi Shweta^*; Jit S

来源：Journal of Semiconductor Technology and Science, 2011, 11(1): 40-50.

DOI：10.5573/JSTS.2011.11.1.040

• Optically controlled GaAs MESFET
• optical biasing
• ion implantation
• gaussian doping profile
• threshold voltage
• MMIC
• Poisson's equation

A two-dimensional (2D) analytical model for the potential distribution and threshold voltage of short-channel ion-implanted GaAs MESFETs operating in the sub-threshold regime has been presented. A double-integrable Gaussian-like function has been assumed as the doping distribution profile in the vertical direction of the channel. The Schottky gate has been assumed to be semi-transparent through which optical radiation is coupled into the device. The 2 I potential distribution in the channel of the short-channel device has been obtained by solving the 2D Poisson's equation by using suitable boundary conditions. The effects of excess carrier generation due to the incident optical radiation in channel region have been included in the Poisson's equation to study the optical effects on the device. The potential function has been utilized to model the threshold voltage of the device under dark and illuminated conditions. The proposed model has been verified by comparing the theoretically predicted results with simulated data obtained by using the commercially available ATLAS (TM) 2D device simulator.

• 出版日期2011-3