低功耗有机场效应晶体管电荷传输性能和光电探测集成阵列的研究

Organic field effect transistors are key building blocks for future wearable devices. In view of the high temperature deterioration of organic materials and the limited power supply of wearable devices, it is of great significance to prepare low-power, high-performance organic field-effect transistors. However, due to the strong interaction between the dielectric polarization of high permittivity (high-k) materials and the charge transport of organic semiconductor molecules, low power consumption and high performance are difficult to achieve simultaneously in organic transistor devices. Specifically, it appears that the mobility properties obtained using a high-k dielectric layer are generally much lower than using a low-k dielectric layer. In response to this scientific challenge, the project focuses on the improvement of the charge transport performance of low-power organic field effect transistors. By combining the optimized dielectric layer and the semiconductor transport layer, the objective is to prepare an organic transistor device with excellent comprehensive performance. Further, it is applied to the field of photodetectors to prepare phototransistors and their flexible integrated arrays. Emphasis is placed on optimizing performance parameters, understanding the working mechanisms, and demonstrating imaging applications. This work will have important guiding significance for promoting the application of organic transistors in the field of flexible wearable sensing devices.

有机场效应晶体管是未来可穿戴设备的关键构筑单元，鉴于有机材料自身的不耐高温性和可穿戴设备携带电源的有限性，制备低功耗、高性能的有机场效应晶体管将具有重要的意义。但是，由于高介电常数（高-k）材料介电极化与有机半导体分子电荷传输的强相互作用，低功耗和高性能很难在有机晶体管器件中同时实现，具体表现为基于高-k介电层得到的迁移率性能通常远低于使用低-k介电层。针对这一关键科学问题，本项目聚焦于低功耗有机场效应晶体管的电荷传输性能的提升，采用优化介电层和半导体传输层相结合的办法，目标制备出综合性能十分优异的有机晶体管器件。并进一步将其应用于光电探测领域，制备光晶体管器件及其柔性集成阵列，重点关注于优化性能参数、深入理解工作机理、以及实现成像功能等应用展示。该工作对推动有机晶体管在柔性可穿戴传感设备领域的应用将具有重要的指导意义。

有机场效应晶体管是柔性电子领域的核心电子元器件，但其应用之路仍面临巨大挑战。其中关键问题之一为高迁移率和低功耗性能难以兼顾，因为高介电常数（高-k）的强偶极性将造成有机半导体的态密度展宽，导致电荷传输的局域性增加，降低迁移率性能。针对这一科学难题，该项目优化了半导体层的制备策略，实现了二维分子晶体的层数可控生长和大面积制备，解决了二维分子晶体的高效电荷注入和柔性阵列集成的难题；提出了高k二维柔性介电层的新型制备策略，获得了两种新的高k介电层材料，为低功耗柔性电子器件的介电层铺平了道路；开发了二维分子晶体与高介电常数（高-k） 介电层相结合的制备工艺，满足了原位生长和任意基底转移的不同需求，实现了兼具高迁移率和低功耗的有机场效应晶体管；提出了厚度可控的高质量的p-n异质结构的制备策略，实现了高性能双极性晶体管的构筑，为逻辑互补电路提供了新方案；发展了新型分子晶体异质结构，独辟蹊径利用栅场放大沟道电流、光场耗尽沟道电流策略，构筑超灵敏负响应光探测器件；发展了栅极电压辅助驻极体捕获电荷的策略构筑多模式集成器件，制备了低功耗柔性光电传感集成阵列器件。我们的研究结果主要以科研论文的形式发表，项目负责人以第一/通讯作者身份在Advanced Materials（2篇）, Journal of Materials Chemistry C（3篇）, Science China-Materials（1篇）等国内外高水平期刊上发表论文9篇；申请国家发明专利1项；培养毕业研究生2名；应邀参加国内外学术会议并作邀请报告5次。项目的顺利实施可为高性能低功耗的光电器件的发展提供理论和技术支持，促进有机电子学的进一步发展和应用。

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