State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology and School of Electronics and Information Technology , Sun Yat-sen University , Guangzhou 510275 , P. R. China.
School of Materials Science and Engineering , Zhengzhou University , 100 Kexue Avenue , Zhongyuan, Zhengzhou , Henan 450001 , P. R. China.
ACS Appl Mater Interfaces. 2019 Feb 20;11(7):7226-7234. doi: 10.1021/acsami.8b21298. Epub 2019 Feb 11.
We developed a facile method for fabricating large-area, two-dimensional (2D), organic, highly crystalline films and extended it to organic thin-film transistor arrays. Tilted spinning provided oriented flow at the three-phase contact line, and a 2D crystalline film that consisted of layer-by-layer stacked 2,7-diocty[1]benzothieno[3,2- b]benzothiophene (C-BTBT) was obtained facilely for organic thin-film transistors (OTFTs). The extracted field-effect mobility is 4.6 cm V s, but with nonideal features. By applying this method to microdroplet arrays, an oriented crystal was fabricated, and the channel region for OTFTs was covered by adjusting the spinning speed. By tuning the tilt angle (θ) of the revolving substrate, we fabricated high-performance OTFT arrays with average and maximum mobilities of 7.5 and 10.1 cm V s, respectively, which exhibited high reliability factors of over 90% and were close to that of ideal transistors. These results suggest that high-quality crystalline films can be obtained via a facile tilted-spinning method.
我们开发了一种简便的方法来制备大面积二维（2D）有机高结晶薄膜，并将其扩展到有机薄膜晶体管阵列。倾斜旋转提供了三相接触线的定向流动，并且容易地获得了由逐层堆叠的 2,7-辛基[1]苯并噻吩[3,2-b]苯并噻吩（C-BTBT）组成的 2D 结晶薄膜，用于有机薄膜晶体管（OTFT）。提取的场效应迁移率为 4.6 cm V s，但具有不理想的特性。通过将该方法应用于微滴阵列，制造出取向晶体，并通过调整旋转速度覆盖 OTFT 的沟道区域。通过调整旋转基板的倾斜角（θ），我们制造出具有平均和最大迁移率分别为 7.5 和 10.1 cm V s 的高性能 OTFT 阵列，其可靠性因子超过 90%，接近理想晶体管。这些结果表明，可以通过简便的倾斜旋转方法获得高质量的结晶薄膜。
