CAREER: Advanced Devices and Testing using Organic Field Effect Transistors

该项目将开发两个新的器件系统，利用有机场效应晶体管(OFET)的处理特性；可编程逻辑单元(有机PAL，创建有机FPGA的构建块)和压电薄膜耦合的OFET放大器。该项目还将调查用于制造和调整有机场效应晶体管(OFET)的工艺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。该项目将回答几个长期存在的问题，即工艺技术对这些器件中浅陷阱态和深陷阱态的影响，绘制OFET中陷阱密度和电活性颗粒分布的空间图谱，并导致对工艺和界面在OFET中的作用的更深层次的理解。制造和器件平台和为其开发的工具将被整合到以顶石实验室为基础的本科课程和扩展计划的模块中，该计划覆盖曼哈顿哈莱姆区未被充分代表的群体。智能优点OFET被用于许多应用中，在这些应用中，它们相对简单的制造、固有的机械灵活性和低温工艺是有益的。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。大多数对基于并五苯的OFET的研究都集中在检查聚集体性质(如I-V特性)的测量上，并且经常做出与陷阱限制的导电不一致的假设。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，将有可能探索否则看不见的各种现象。最令人感兴趣的是以大面积兼容方式进行处理的效果。开发的工具还将能够探测在该计划中制造的可编程逻辑单元和压电器件的内部状态。广泛影响该计划将产生重大影响，超出其直接的科学和工程成果。许多学生将参与这个项目，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，以及每年一名博士生。这些学生将为国家提供这一领域的高素质人才做出贡献。一个额外的外展部分将通过哥伦比亚大学工程与应用科学学院管理的GK12/TIP计划进行。该项目的第二名研究生将提供两个学生年的外展，他将与哈莱姆区的高中教师合作，开发和提供基于这项工作的教学模块。这一扩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之前的工作整合在一起，在哥伦比亚大学创建一门关于先进显示设备的新的Capstone本科实验室课程。该方案的研究和教育部分的成果将通过这一领域的文献和会议向其他研究人员和广大公众传播。在社会层面上，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，为我们的社会和全球社区带来重大好处。

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.