In this paper, we present the unique features exhibited by a novel double gate MOSFET in which the front gate consists of two side gates as an extension of the source/drain. The asymmetrical side gates are used to induce extremely shallow source/drain regions on either side of the main gate. Using two-dimensional and two-carrier device simulation, we have investigated the improvement in device performance focusing on the threshold voltage roll-oﬀ, the drain induced barrier lowering, the subthreshold swing and the hot carrier eﬀect. Based on our simulation results, we demonstrate that the proposed symmetrical double gate SOI MOSFET with asymmetrical side gates for the induced source/drain is far superior in terms of controlling the short-channel eﬀects when compared to the conventional symmetrical double gate SOI MOSFET. We show that when the side gate length is equal to the main gate length, the device can be operated in an optimal condition in terms of threshold voltage roll-oﬀ and hot carrier eﬀect. We further show that in the proposed structure the threshold voltage of the device is nearly independent of the side gate bias variation.
2005 Elsevier B.V. All rights reserved.
Keywords: Short-channel eﬀects; MOSFET; Threshold voltage; Two-dimensional simulation; Induced source/drain
The above paper can be downloaded from http://web.iitd.ac.in/~mamidala/id11.htm