Threshold voltage in junctionless nanowire transistors

• Published in: Semiconductor science and technology Vol. 26; no. 10; pp. 105009 - 2
• Main Authors: Trevisoli, Renan Doria, Doria, Rodrigo Trevisoli, de Souza, Michelly, Pavanello, Marcelo Antonio
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 12.10.2011; Institute of Physics
• Subjects: Applied sciences; Computer simulation; Electronics; Exact sciences and technology; Gates; Mathematical models; Molecular electronics, nanoelectronics; Nanowires; Oxides; Quantum confinement; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Semiconductors; Threshold voltage; Transistors; Quantum confinement; Voltage threshold; Circuit design; Oxide layer; PMOS technology; Transistor gate; Poisson equation; Transistor; Two dimensional model; Nanoelectronics; Thickness; Three dimensional model; Gate oxide; Junctionless transistor; Concentration effect; Analytical method; Capacitance; Nanowires; Planar device; NMOS technology; Computer aided design
• ISSN: 0268-1242; 1361-6641
• DOI: 10.1088/0268-1242/26/10/105009

This work presents a physically based analytical model for the threshold voltage in junctionless nanowire transistors (JNTs). The model is based on the solution of the two-dimensional Poisson equation and includes the dependence on JNT width, height and doping concentration. The quantum confinement has also been taken into consideration in the model formulation. The model is validated using experimental results of nMOS and pMOS JNTs, and three-dimensional TCAD simulations where the nanowire width and height, doping concentration, gate oxide thickness and temperature have been varied. The gate oxide capacitance is also addressed aiming to adequately calculate the capacitance in non-planar devices. The temperature influence on the threshold voltage of JNTs is also analyzed. The presented model shows excellent agreement with both experimental and simulated data, adequately describing the JNT threshold voltage.