去润湿图案化制备TIPS-并五苯有机薄膜晶体管

Wetting/Dewetting Patterned TIPS-Pentacene Organic Thin-Film Transistor

利用润湿/去润湿的方法配合旋涂工艺制备了图案化的TIPS-并五苯有机半导体薄膜,制备了顶接触有机薄膜晶体管(OTFTs)。金相显微镜观察发现,转速的选择对TIPS-并五苯薄膜结晶形貌的影响较大。在1 000～2 000r/min转速下制备的薄膜完整性好,结晶区域较大;而转速增加到3 000r/min后,难以获得完整的薄膜且晶粒尺寸变小。电学性能研究得到器件的输出曲线、转移曲线、开关电流比、阈值电压、场效应迁移率,发现结晶形貌好的器件具有更好的电学性能。1 000r/min转速下制备OTFT器件最大场效应迁移率为5.16×10-2 cm·V-1·s-1,电流开关比为8×103。

Top-contact organic thin-film transistors array was prepared by slectively dewetting of 6,13-Bis（triisopropylsilylethynyl） pentacene（TIPS-Pentacene） solution.The optical microscope images showed that the morphology of TIPS-pentacene crystal was influenced by the rotation speed.The TIPS-pentacene thin-films prepared at 1 000~2 000 r/min had good connectivity and large crystal domains.As the rotation speed increased to 3 000 r/min,the patterned film became incomplete and the crystal domain size reduced.The output and transfer curve,on/off current ratio,threshold voltage and field-effect mobility of the device were obtained by electric measurements.The TIPS-pentacene OTFTs prepared at 1 000 r/min had a maximum field-effect mobility of up to 5.16×10-2 cm·V-1·s-1 and an on/off current ratio of 8×103.