All Electrohydrodynamic Printed Flexible Organic Thin Film Transistors
All Electrohydrodynamic Printed Flexible Organic Thin Film Transistors
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DOI：
10.1002/admt.202300410
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发表时间：
2023-06
影响因子：
6.8
通讯作者：
Ping Ren;Runqiao Song;Yong Zhu;B. O’Connor;Jingyan Dong
中科院分区：
文献类型：
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作者：
Ping Ren;Runqiao Song;Yong Zhu;B. O’Connor;Jingyan Dong
近年来，由于电子皮肤、可穿戴设备和医疗贴片等各种应用需要灵活的接口设备，对印刷柔性晶体管的经济高效制造的需求急剧增加。在这项研究中，开发了电流体动力（EHD）印刷工艺来制造聚合物基有机薄膜晶体管（OTFT）的所有组件，包括源极/漏极和栅极、半导体沟道和栅极电介质，从而简化了柔性OTFT的制造程序。具有顶栅底接触结构的柔性晶体管是通过集成有机半导体（即聚（3-己基噻吩-2,5-二基）与小分子2,7-二辛基[1]苯并噻吩并[3,2-b][1]苯并噻吩混合）、导电聚合物（即聚（3,4-乙撑二氧噻吩）聚苯乙烯磺酸盐）和离子凝胶电介质制成的。这些功能性油墨采用正交溶剂精心设计，使其能够兼容印刷到多层柔性 OTFT 中。每个功能组件的 EHD 打印过程都经过实验表征和优化。完全EHD印刷的OTFT表现出良好的电气性能，迁移率为2.86×10−1 cm2 V−1 s−1，开/关比为104，并且具有良好的机械灵活性，在6毫米弯曲半径下迁移率变化较小，并且在数百次弯曲循环下具有稳定的晶体管响应。所展示的全基于印刷的制造工艺为采用 OTFT 的柔性电子产品提供了一条经济有效的途径。
The demand of cost‐effective fabrication of printed flexible transistors has dramatically increased in recent years due to the need for flexible interface devices for various application including e‐skins, wearables, and medical patches. In this study, electrohydrodynamic (EHD) printing processes are developed to fabricate all the components of polymer‐based organic thin film transistors (OTFTs), including source/drain and gate electrodes, semiconductor channel, and gate dielectrics, which streamline the fabrication procedure for flexible OTFTs. The flexible transistors with top‐gate‐bottom‐contact configuration are fabricated by integrating organic semiconductor (i.e., poly(3‐hexylthiophene‐2,5‐diyl) blended with small molecule 2,7‐dioctyl[1]benzothieno[3,2‐b][1]benzothiophene), conductive polymer (i.e., poly (3,4‐ethylenedioxythiophene) polystyrene sulfonate), and ion‐gel dielectric. These functional inks are carefully designed with orthogonal solvents to enable their compatible printing into multilayered flexible OTFTs. The EHD printing process of each functional component is experimentally characterized and optimized. The fully EHD‐printed OTFTs show good electrical performance with mobility of 2.86 × 10−1 cm2 V−1 s−1 and on/off ratio of 104, and great mechanical flexibility with small mobility change at bending radius of 6 mm and stable transistor response under hundreds of bending cycles. The demonstrated all printing‐based fabrication process provides a cost‐effective route toward flexible electronics with OTFTs.