Laterally Expanded Rylene Diimides with Uniform Branched Side Chains for Solution-Processed Air Stable n-Channel Thin Film Transistors

详细信息    查看全文

• 作者：Chengyi Xiao ; Wei Jiang ; Xiangguang Li ; Linxiao Hao ; Chunming Liu ; Zhaohui Wang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2014
• 出版时间：October 22, 2014
• 年：2014
• 卷：6
• 期：20
• 页码：18098-18103
• 全文大小：387K
• ISSN：1944-8252

文摘

Molecular packing motifs in solid states is the dominant factor affecting the n-channel organic field-effect transistors (OFETs). However, few systematic researches were performed in the different extensions of 蟺-conjugated molecules with the uniform substitution effecting the molecular packing motifs. In this manuscript, OFET devices based on three latterally expanded rylene diimides end-functionalized with uniform 3-hexylundecyl substitution on the imide positions were systematically studied on the relationship of molecular stacking, film microstructure, and charge transport. As the 蟺-conjugated systems expanded from doubly linked perylene diimide dimer (d-4CldiPDI, 1), triply linked perylene diimide dimer (t-4CldiPDI, 2), to hybrid array (NDI-PDI-NDI, 3), their corresponding molecular packing motifs exhibited a divide: the optimized molecular configuration became more planar and d (001) spacing distances became larger, which resulted in a larger 蟺鈥撓€ overlapping. Thus, an enhanced electron mobility was obtained. A typical n-channel field-effect characteristic was observed in thin film devices based on these molecules under ambient conditions. Especially, the hybrid system (3) with more planar and 蟺-expanded aromatic backbone exhibited superior electron mobility approaching 0.44 cm² V^鈥? s^鈥? and on/off ratio of 10⁶ after optimal annealing in this study.

Keywords:

lateral expansion; rylene diimides; uniform branched side chains; n-channel OFETs; molecular packing motifs; d-spacings