The effect of random dopant fluctuation on threshold voltage and drain current variation in junctionless nanotransistors

作     者：Arash Rezapour Pegah Rezapour 

作者机构：Electrical Engineering DepartmentFaculty of EngineeringIslamic Azad University of Arak MScElectrical Engineering DepartmentFaculty of EngineeringIslamic Azad University of Khomein 

出 版 物：《Journal of Semiconductors》 (半导体学报（英文版）)

年 卷 期：2015年第36卷第9期

页      面：20-25页

核心收录：

学科分类：080903[工学-微电子学与固体电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

主　　题：junctionless transistor subthreshold region above threshold region short-channel effects fieldimpedance method 

摘      要：We investigate the effect of dopant random fluctuation on threshold voltage and drain current variation in a two-gate nanoscale transistor. We used a quantum-corrected technology computer aided design simulation to run the simulation （10000 randomizations）. With this simulation, we could study the effects of varying the dimensions （length and width）, and thicknesses of oxide and dopant factors of a transistor on the threshold voltage and drain current in subthreshold region （off） and overthreshold （on）. It was found that in the subthreshold region the variability of the drain current and threshold voltage is relatively fixed while in the overthreshold region the variability of the threshold voltage and drain current decreases remarkably, despite the slight reduction of gate voltage diffusion （compared with that of the subthreshold）. These results have been interpreted by using previously reported models for threshold current variability, load displacement, and simple analytical calculations. Scaling analysis shows that the variability of the characteristics of this semiconductor increases as the effects of the short channel increases. Therefore, with a slight increase of length and a reduction of width, oxide thickness, and dopant factor, we could correct the effect of the short channel.