Dynamic Response of Polymer Transistors and their Application in Fast Circuits

本研究的目的是开发一种全新的实验方法，可用于研究聚合物/有机晶体管中的漂移速度（载流子在通道中移动的速度）、漂移迁移率和陷阱分布。该方法是研究晶体管中的时间分辨输运，如快速脉冲测量，电脉冲响应测量，并对半波和全波整流器响应进行分析，以推断晶体管中的载流子速度。初步研究结果表明，载流子的移动速度与声速相当（约105厘米/秒），并且由聚合物晶体管制成的一种特殊类型的非准静态电路可以在2微米通道长度的设备上以超过20兆赫兹的速度运行。这种电路被设计成在单个晶体管没有完全打开的情况下工作。希望通过将通道长度缩小到约100纳米，可以实现几个100兆赫的电路速度。该提案的更广泛影响将是推动集成有机电路的发展，从而影响有机电子产品商业化的工业努力。智力优势：从教育的角度来看，这将对德州大学奥斯汀分校电气工程专业的研究生和本科生的研究型教育产生影响。这项工作还将影响两个专业课程的发展。这项研究也将有助于吸引更多的妇女/少数民族学生从事工程研究。

The objective of this research is to develop a whole new range of experimental methods that can be used to study the drift velocity (velocity at which charge carriers move in the channel), drift mobility, and trap distribution in polymer/organic transistors. The approach is to study time-resolved transport in transistors such as fast pulse measurements, electrical impulse response measurements, and performing an analysis on half-wave and full-wave rectifier response to deduce the carrier velocities in transistors. Preliminary findings indicate that carriers move at velocities that are comparable to the speed of sound ( ca. 105 cm/s), and that a particular class of circuits called non quasi-static circuits made with polymer transistors can operate at speeds in excess of 20 MHz for 2 micron channel length devices. Such circuits are designed to operate in the regime in which the individual transistors are not fully turned on. It is hoped that by scaling the channel length down to about 100 nm, circuit speeds of several 100 MHz will be possible. The broader impact of this proposal will be to advance the development of integrated organic circuitry and therefore to impact industrial efforts to commercialize organic electronics products. Intellectual Merit: From an educational perspective, the impact will be research-oriented education of both graduate and undergraduate students in Electrical Engineering at UT Austin. This work will also impact the evolution of two specialized courses. This research will also be useful in helping attract more women/minority students into engineering research.