单电子晶体管用于电荷检测的研究

• 作 者: 苏丽娜 吕利 李欣幸 秦华 顾晓峰
• 机 构: 江南大学电子工程系轻工过程先进控制教育部重点实验室,中国科学院苏州纳米技术与纳米仿生研究所纳米器件与应用重点实验室,
• 出 处: 微纳电子技术
• 发表日期: 2014年10期
• 关键词: single electron transistor (SET) Coulomb island electrometer charge detection

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。

Single-electron transistors can be used as an ultra-sensitive charge meter for highly sensitive charge detection. Firstly, the circuit model of single-electron transistor charge detection is established and its charge detection mechanism is illustrated. Then, the detection process is simulated by COMSOL and MATLAB software. The potential of single-transistor Coulomb island with different charge and detection distance is analyzed. The influence of the charge amount, the detection distance and the electrostatic coupling between charges on the conductance of a single electron transistor has also been studied. The results show that the operating point and detection distance of single electron transistor determine the range of charge detection. The best detection distance should be set at the maximum slope of conductance - distance curve.