发光学报, 2014, 35 (1): 105, 网络出版: 2014-01-17
基于聚(4-乙烯基苯酚)衬底修饰层喷墨打印的小分子有机半导体薄膜制备和表征
Preparation and Characterization of Inkjet-printed Small-molecule Organic Semiconductor Thin Films Based on A Surface Modification Layer of Poly(4-vinylphenol)
有机半导体 有机薄膜晶体管 喷墨打印 表面修饰 绝缘聚合物 organic semiconductor organic thin-film transistor (OTFT) inkjet printing surface modification insulating polymer
摘要
采用旋涂法预先在SiO2衬底表面形成一层聚(4-乙烯基苯酚)(PVP)作为表面修饰层, 以喷墨打印的6,13-双(三异丙基甲硅烷基乙炔基)并五苯(TIPS并五苯)作为有源层制作有机薄膜晶体管, 有效改善了有机半导体薄膜的形貌。采用真空热蒸镀工艺制备源漏电极, 形成底栅顶接触结构的有机薄膜晶体管(OTFT)器件。作为对比, 在未经过表面修饰的SiO2衬底上采用相同条件打印TIPS并五苯薄膜晶体管, 发现在经过PVP修饰的SiO2衬底上打印的单点厚度更均匀, 咖啡环效应被抑制或被消除; 而通过多点交叠打印形成的矩形薄膜的晶粒尺寸更大, 相应的OTFT器件具有更高的场效应迁移率。在有PVP修饰层的衬底上制作的OTFT, 器件在饱和区的平均场效应迁移率达到了0.065 cm2·V-1·s-1; 而直接在SiO2衬底上制作的器件, 相应的平均场效应迁移率仅为0.02 cm2·V-1·s-1。
Abstract
Organic thin-film transistors (OTFTs) were prepared with inkjet-printed 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS-pentacene) as the active semiconducting layer. Poly(4-vinylphenol) (PVP) was spin-coated on the surface of SiO2 substrates as the surface modification layer to improve film morphology of the semiconductor. The source and drain electrodes were thermally eva-porated through a metal mask to complete the OTFTs with a bottom-gate top-contact (BGTC) structure. Compared with the TIPS-pentacene films inkjet-printed on the controlled SiO2 substrate without PVP modification layer, the single-drop semiconductor films deposited on the PVP-modified substrate show much reduced coffee-ring effect and therefore better film uniformity, while large-area films with rectangular pattern printed with overlapping multi-drop shows larger grain size and the corresponding OTFTs also exhibits enhanced field-effect mobility. The average field-effect mobility of the inkjet-printed film on the PVP-modified substrate was as high as 0.065 cm2·V-1·s-1, while the average field-effect mobility of the semiconductor directly printed on the SiO2 substrate was merely 0.02 cm2·V-1·s-1.
熊贤风, 元淼, 林广庆, 王向华, 吕国强. 基于聚(4-乙烯基苯酚)衬底修饰层喷墨打印的小分子有机半导体薄膜制备和表征[J]. 发光学报, 2014, 35(1): 105. XIONG Xian-feng, YUAN Miao, LIN Guang-qing, WANG Xiang-hua, LYU Guo-qiang. Preparation and Characterization of Inkjet-printed Small-molecule Organic Semiconductor Thin Films Based on A Surface Modification Layer of Poly(4-vinylphenol)[J]. Chinese Journal of Luminescence, 2014, 35(1): 105.