Modeling the CMOS Characteristics of a Completely Depleted Surrounding-Gate Nanotransistor and an Unevenly Doped Working Region
- 5 Downloads
The issues of modeling the basic electrophysical characteristics of fully depleted surrounding-gate CMOS nanotransistors with an unevenly doped working region are discussed. The case of a Gaussian impurity distribution in the radial direction with the maximum in the center of the working area is analyzed. A mathematical model of the potential distribution following from an analytical solution of the 2D Poisson equation is treated. The results of model calculations of the potential distribution of a sub-50 nm structures are in good agreement with the data obtained using the commercially available ATLASTM software package for the 2D modeling of transistor structures. Based on the obtained potential distributions, the characteristics of the current are calculated using the tested approach formulated in the charge separation concept. For the topological norms chosen, optimization of the steepness of the doping profile provides an additional opportunity to control the key characteristics, together with the radius of the working region and the thickness of the gate oxide. This is important when analyzing the applicability of the analyzed nanotransistor structures.
Keywords:fully depleted surrounding-gate CMOS nanotransistor 2D Poisson equation unevenly doped working region current–voltage characteristics
The work was performed as part of a state assignment for Basic Scientific Research (GP 14), project no. 0065-2019-0001.
- 3.Son, A., Kim, J., Jeong, N., Choi, J., and Shin, H., Improved explicit current-voltage model for long-channel undoped surrounding-gate metal oxide semiconductor field effect transistor, J. Appl. Phys., 2009, vol. 48, pp. 412–413.Google Scholar
- 8.Masal’skii, N.V., Characteristics of two gate SOI CMOS nanotransistors for advanced technologies with low power consumption, Mikroelektronika, 2012, vol. 41, no. 6, pp. 436–444.Google Scholar
- 13.Silvaco, Int., ATLAS User’s Manual: A 2D Numerical Device Simulator. http://www.silvaco.com/. Accessed Nov. 25, 2016.Google Scholar
- 17.Sze, S.M., Physics of Semiconductor Devices, New York: Wiley, 1981.Google Scholar
- 19.Neamen, D., Semiconductor Physics and Devices: Basic Principles, New York: McGraw-Hill, 2011.Google Scholar