CAREER: Advanced Devices and Testing using Organic Field Effect Transistors

本项目将开发两种新的器件系统，利用有机场效应晶体管（ofet）的加工特性；可编程逻辑单元（有机PAL，用于创建有机FPGA的构建块）和压电薄膜耦合OFET放大器。该项目还将研究用于制造和调谐有机场效应晶体管（ofet）的加工技术与电路级性能之间的相互作用。这项工作将开发一种新的工具来直接测量OFET器件中的陷阱状态，以更彻底地表征这种相互作用。拟议的项目将回答几个长期存在的问题，即加工技术对这些器件中浅阱和深阱状态的影响，在空间上绘制ofet中的陷阱密度和电活性颗粒分布，并对加工和界面在ofet中的作用有更深的理解。制作和设备平台以及为此开发的工具将被整合到以实验室为基础的本科课程和扩展项目的模块中，该项目将覆盖曼哈顿哈莱姆社区中代表性不足的群体。在许多应用中，ofet的制造相对简单，固有的机械灵活性和低温工艺都是有利的。该项目将开发两种新的器件架构，利用ofet的低加工温度和灵活性来创建可编程逻辑单元和压电传感器。对五苯基ofet的大多数研究都集中在检查聚集体特性（如I-V特性）的测量上，并且经常做出与陷阱限制传导不一致的假设。通过使用适当的模型，并在时间、位置和能量上解决激发和测量，将有可能探测到各种不可见的现象。最令人感兴趣的是以大面积兼容方式处理的效果。开发的工具还将能够探测在该程序中制造的可编程逻辑单元和压电器件的内部状态。更广泛的影响该计划将产生重大影响，超出其直接的科学和工程产出。一些学生群体将参与该项目，包括每年夏天通过NYAS SRTP计划招募的一名高中生，每年一名本科生，每年一名博士生。这些学生将为国家在这一领域提供高素质的人才。哥伦比亚大学工程与应用科学学院管理的GK12/TIP项目将成为该项目的另一个扩展部分。该项目的第二名研究生将提供两年的外展服务，他将与哈莱姆区的高中教师一起开发和提供基于这项工作的教学模块。这种拓展将对传统上代表性不足的学生群体产生重大影响。开发的设备平台将与PI之前的工作相结合，在哥伦比亚大学创建一个关于先进显示设备的新的顶点本科实验课程。该方案的研究和教育部分的结果将通过该领域的文献和会议传播给其他研究人员和广大公众。在社会规模上，OFET技术的发展具有巨大的潜力。基于这些设备的系统的广泛可用性可能会彻底改变医疗保健、IT、银行、商业和安全的交付方式，为我们的社会和全球社区带来重大利益。

This project will develop two new device systems which take advantage of the processing characteristics of organic field effect transistors (OFETs); a programmable logic cell (an organic PAL, a building block for creating an organic FPGA) and a piezoelectric film coupled OFET amplifier. The project will also investigate the interplay between the processing technologies used to fabricate and tune organic field effect transistors (OFETs) and circuit-level performance. This effort will develop a new tool to directly measure trap states in OFET devices to more thoroughly characterize that interplay. The proposed project will answer several long standing questions about the influence of processing techniques on shallow and deep trap states in these devices, spatially map both the trap density and electrically active grain distribution in OFETS, and lead to a deeper understanding of the role of processing and interfaces in OFETs. The fabrication and device platform and the tools developed for it will be integrated into both a capstone laboratory-based undergraduate course and modules for an outreach program which reaches underrepresented groups in the Harlem neighborhood of Manhattan.Intellectual meritOFETs are used in a number of applications where their relatively straightforward fabrication, inherent mechanical flexibility, and low temperature processes are of benefit. This project will develop two new device architectures that take advantage of the low processing temperature and flexibility of OFETs to create a programmable logic cell and a piezoelectric sensor. Most examination of pentacene-based OFETs has focused on measurements that examine aggregate properties (such as I-V characteristics) and often make assumptions inconsistent with trap-limited conduction. By using appropriate models and resolving both excitation and measurement in time, location, and energy, it will be possible to probe a variety of phenomena which are otherwise invisible. Of greatest interest are the effects of processing in a large-area compatible fashion. The tools developed will also be able to probe the internal states of the programmable logic cell and piezoelectric device fabricated in this program.Broader impactThis program will have significant impact beyond its immediate scientific and engineering output. A number of student populations will be engaged by this project including a high school student recruited through the NYAS SRTP program each summer, one undergraduate student each year, and one doctoral student per year. These students will contribute to the national supply of highly qualified personnel in this field. An additional outreach component will be through Columbia's GK12/TIP program administered through the School of Engineering and Applied Science. Two student years of outreach will be delivered by a second graduate student on the project who will work with high school teachers in Harlem to develop and deliver teaching modules based on this work. This outreach will have a significant impact on a traditionally underrepresented student population.The device platforms developed will be integrated with the PI's previous work to create a new capstone undergraduate laboratory course at Columbia University on advanced display devices. Results from the research and educational components of the program will be disseminated through the literature and conferences in this field to other researchers and the public at large. On a societal scale, the development of OFET technology has tremendous potential. Wide availability of systems based on these devices could revolutionize the delivery of healthcare, IT, banking, commerce, and security, bringing significant benefits to both our society and the global community.