Analysis of Metal Work-Function Modulation Effect in Reconfigurable Field-Effect Transistor
Xianglong Li, Yabin Sun, Ziyu Liu, Xiaojin Li, Yanling Shi, Teng Wang, Jun Xu
Abstract
Work-function modulation in a reconfigurable field-effect transistor (RFET) is investigated by 3-D TCAD simulations. A significant work-function dependence is found in the critical electrical performances of RFET. The results show that the ON-state drive current ION is mainly dominated by the control gate (CG) and source work function, while the OFF-state leakage current IOFF is dominated by program gate and drain work function. With the workfunction regulation, more flexible electrical characteristics among both n- and p-type configurations can be obtained, and an RFET with strict symmetric ON-state current and I <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">ON</sub> /I <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">OFF</sub> ratio, that is, (I <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">ON</sub> ) <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">n</sub> : (I <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">ON</sub> ) <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">p</sub> = (I <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">OFF</sub> ) <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">n</sub> : (I <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">OFF</sub> ) <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">p</sub> = 1 : 1, has been realized in this work. The underlying physical mechanism is explored, and the corresponding performance of the application in logic and memory is discussed. Moreover, the work-function regulation in CG and source can be recognized as an effective method to subtle tweak noise margin of electrical systems.