中文摘要：

单电子晶体管可用作超灵敏电荷计进行高灵敏电荷检测。首先建立了单电子晶体管电荷检测的电路模型,阐释了其电荷检测机制;然后利用COMSOL和MATLAB软件对检测过程进行了模拟研究,分析了不同电荷量和检测距离时单电子晶体管库仑岛的电势,并研究了电荷量、检测距离及电荷间静电耦合对单电子晶体管电导的影响。结果表明,单电子晶体管电荷检测时工作点和检测距离决定其电荷检测的量程,最佳检测距离应设置在电导-距离曲线的斜率最大处。

英文摘要：

Single electron transistor（SET）can be used as ultra-sensitive electrometer to detect the variation of the high sensitive charge.The circuit model of the SET for the charge detection was established,and the charge detection mechanism was analyzed.Then,the detection process was simulated and studied by the COMSOL and MATLAB softwares.The Coulomb island potential of the SET was analyzed at different charges and detection distances,and the effects of charge,detection distance and electrostatic coupling between charges on the electrical conductance of the SET were analyzed.The results indicate that during the charge detection of the SET,the charge detection range of the SET is determined by the operating point and the detection distance.The optimal detection distance should be set at the point of maximum slope of the conductance-distance curve.