Anisotropic field-effect hole mobility of liquid crystalline conjugated polymer layers formed on photoaligned polyimide films
Anisotropic field-effect hole mobility of liquid crystalline conjugated polymer layers formed on photoaligned polyimide films
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DOI：
10.1063/1.3527066
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发表时间：
2011-01
影响因子：
3.2
通讯作者：
K. Sakamoto;T. Yasuda;K. Miki;M. Chikamatsu;R. Azumi
中科院分区：
文献类型：
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作者：
K. Sakamoto;T. Yasuda;K. Miki;M. Chikamatsu;R. Azumi
我们制作了具有高度取向的聚[（9，9-dioctylfluorenyl-2，7-diyl）-co-bithiophene]（F8 T2）活性层的有机场效应晶体管（OFFEs），该活性层是借助于光取向聚酰亚胺膜形成的。由于光对准技术具有二维对准的潜在能力，因此它是一种有吸引力的将具有对准的有源层的OFFET集成在同一衬底上的技术。在285 °C下退火后，在光配向聚酰亚胺膜上形成的F8 T2层显示出大于15的吸收二向色比。具有聚对二甲苯栅极绝缘层的顶栅/底接触型OFFET沿着F8 T2主干结构的取向方向表现出增强的空穴迁移率（0.016 cm 2 V-1 s-1），而沿着垂直方向表现出抑制的空穴迁移率（0.002 cm 2 V-1 s-1）。这一结果表明，光取向聚酰亚胺薄膜是一个有吸引力的取向层，用于制造和集成OFFERS与取向有源层。电流方向相关的偏置应力效应W.
We have fabricated organic field-effect transistors (OFETs) with a highly oriented active layer of poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-bithiophene] (F8T2), which was formed with the help of a photoaligned polyimide film. Photoalignment is an attractive technique for integrating OFETs with aligned active layers on the same substrate, because of its potential capability of two-dimensional alignment patterning. The F8T2 layer formed on the photoaligned polyimide film showed an absorption dichroic ratio greater than 15 after annealing at 285 °C. Top-gate/bottom-contact-type OFETs with a parylene gate insulating layer exhibited an enhanced hole mobility (0.016 cm2 V−1 s−1) along the alignment direction of the F8T2 backbone structure and a suppressed one (0.002 cm2 V−1 s−1) along the perpendicular direction. This result shows that the photoaligned polyimide film is an attractive alignment layer for fabricating and integrating OFETs with aligned active layers. Current-direction-dependent bias stress effect w...