喷墨打印C8-BTBT薄膜中的衬底效应及其OTFT器件  

Substrate Effect in Inkjet Printed C8-BTBT Films and the OTFT Devices

作　　者：王向华[1,2,3] 顾勋 张春雨[1,2,3] 李博[1,2,3] 吕申宸 Wang Xianghua a b c Gu Xun a(a. Key Laboratory of Special Display Technology of Ministry of Educatio b. National Engineering Laboratory of Special Display Technolog c. National Key Laboratory of Advanced Display Technology, Academy of Photoelectric Technology, Hef ei University of Technology, Hefei 230009, China)

机构地区：[1]合肥工业大学光电技术研究院特种显示技术教育部重点实验室,合肥230009 [2]合肥工业大学光电技术研究院特种显示技术国家工程实验室,合肥230009 [3]合肥工业大学光电技术研究院现代显示技术省部共建国家重点实验室,合肥230009

出　　处：《微纳电子技术》2017年第8期522-527,538,共7页Micronanoelectronic Technology

基　　金：国家自然科学基金资助项目(51203039);科技部973计划前研专项资助项目(2012CB723406)

摘　　要：以喷墨打印制备的共轭有机小分子2,7-二辛基[1]苯并噻吩并[3,2-b]苯并噻吩(C8-BTBT)作为有机薄膜晶体管(OTFT)的有源层,分别采用紫外臭氧处理、旋涂聚(4-乙烯基苯酚)(PVP)薄膜、自组装苯乙基三氯硅烷(PETS)单分子层和苯基三氯硅烷(PTS)单分子层四种衬底修饰方法,分析有机小分子薄膜生长过程中的衬底效应,及其对OTFT器件性能的影响。其中PVP或PETS修饰衬底具有疏水及低表面粗糙度的特性,在其上喷墨打印沉积的C8-BTBT单线条薄膜具有均匀性好、覆盖率高且有序堆积的结晶形貌,基于这种高质量薄膜制备的OTFT器件性能最优,饱和场效应迁移率达到1 cm2·V-1·s-1左右,开关比超过106。结果表明,对打印衬底进行疏水性处理及降低表面粗糙度是制备高性能共轭小分子OTFT器件的有效途径。With inkjet-printed 2,7-dioctyl [1]benzothieno [3,2-b] [1]benzothiophene（C8-BTBT）as the active layer of organic thin-film transistors（OTFTs）,the substrate effect in film growth of organic small molecules and its influence on the performances of the OTFT devices were analyzed by the four methods of the substrate modification,including UV-ozone treatment,spin-coated poly-4-vinyl phenol（PVP）thin film,self-assembled monolayer of phenethyltrichlorosilane（PETS）and that of phenyltrichlorosilane（PTS）.The C8-BTBT single-line films deposited by the inkjet printing on the PVP or PETS modified substrates have good uniformity,high coverage and orderly crystalline morphologies because of substrates with properties of hydrophobicity and low surface roughness.The OTFT devices prepared based on the high quality films have the best performances.The saturation field effect mobility reaches about 1 cm^2·V^-1·s^-1,and the on/off ratio is more than 106.The results reveal an effective way for preparing high performance OTFT devices of conjugated small molecules by combining hydrophobic treatment with decreased surface roughness for printing substrates.

关 键 词：有机薄膜晶体管(OTFT) 喷墨打印 2 苯并噻吩并[3 2-b]苯并噻吩(C8-BTBT) 衬底效应 迁移率 

分 类 号：TN321.5[电子电信—物理电子学]