Evaluation of Carrier Velocity in Organic Single Crystal and Polycrystalline Thin-Film Transistors and Development of a Velocity-Field Model

本研究的目的是评估单晶基和多晶有机晶体管的速度-电场特性。该方法是使用直流测量和瞬变测量来测量高达106V/cm的电场的速度。直流测量涉及从一组小通道长度设备的输出特性中提取速度。暂态测量包括沟道形成时间的测量和速度信息的提取。智能优点：了解载流子速度与电场的关系对于理解有机晶体管中的电荷传输机制很重要。由于需要专门的仪器、设备结构和测量方法，研究小组通常不会进行这样的测量。拟议的工作将满足这一需求并填补这一空白。此外，拟议的研究将能够表征陷阱现象及其对晶体管导通和关断特性的影响。这将有助于设计电路和系统，例如基于有机晶体管的显示器。陷阱现象在薄膜晶体管中尤其重要。更广泛的影响：这项工作将导致有机电子学课程的继续发展，以及为工业/学术界培养训练有素的人力资源，包括博士学位。少数族裔和女性学生将获得研究机会，从而增强劳动力的多样性。与美国行业的互动将导致这项工作和协作工作产生的信息的知识转移。与地区学校的接触将促进这类学生对科学和工程的兴趣。

The objective of this research is to evaluate the velocity-electric field characteristics of single crystal based and polycrystalline organic transistors. The approach is to use both DC and transient measurements to measure the velocities at electric fields up to 106 V/cm. DC measurements involve the extraction of velocities from the output characteristics of a set of small-channel length devices. Transient measurements involve the measurement of channel formation time and the extraction of velocity information.Intellectual Merit: Knowledge of the charge carrier velocity-electric field relationship is important in understanding charge transport mechanisms in organic transistors. Such measurements are not routinely done by research groups due to the requirement of specialized instrumentation, device structures, and measurement methods. The proposed work will address this need and fill this gap. Additionally, the proposed research will enable the characterization of trapping phenomena and its effects on the turn-on and turn-off characteristics of transistors. This will be useful in designing circuits and systems such as displays based on organic transistors. Trapping phenomena are especially important in thin-film transistors.Broader Impact.: This work will lead to the continued development of coursework in organic electronics as well as the production of trained human resources for industry/academia including Ph.Ds. Minority and women students will be given research opportunities leading to enhanced diversity in the workforce. Interactions with US-based industries will lead to knowledge transfer of information generated from this work and collaborative work. Outreach to area schools will promote interest in science and engineering among such students.