Isoindigo-Based Small Molecules with Varied Donor Components for Solution-Processable Organic Field Effect Transistor Devices
作者:Hemlata Patil、Jingjing Chang、Akhil Gupta、Ante Bilic、Jishan Wu、Prashant Sonar、Sheshanath Bhosale
DOI:10.3390/molecules200917362
日期:——
Two solution-processable small organic molecules, (E)-6,6′-bis(4-(diphenylamino)phenyl)-1,1′-bis(2-ethylhexyl)-(3,3′-biindolinylidene)-2,2′-dione (coded as S10) and (E)-6,6′-di(9H-carbazol-9-yl)-1,1′-bis(2-ethylhexyl)-(3,3′-biindolinylidene)-2,2′-dione (coded as S11) were successfully designed, synthesized and fully characterized. S10 and S11 are based on a donor-acceptor-donor structural motif and contain a common electron accepting moiety, isoindigo, along with different electron donating functionalities, triphenylamine and carbazole, respectively. Ultraviolet-visible absorption spectra revealed that the use of triphenylamine donor functionality resulted in an enhanced intramolecular charge transfer transition and reduction of optical band gap, when compared with its carbazole analogue. Both of these materials were designed to be donor semiconducting components, exerted excellent solubility in common organic solvents, showed excellent thermal stability, and their promising optoelectronic properties encouraged us to scrutinize charge-carrier mobilities using solution-processable organic field effect transistors. Hole mobilities of the order of 2.2 × 10−4 cm2/Vs and 7.8 × 10−3 cm2/Vs were measured using S10 and S11 as active materials, respectively.
两种可溶液加工的有机小分子,(E)-6,6′-双(4-(二苯基氨基)苯基)-1,1′-双(2-乙基己基)-(3,3′-双吲哚啉亚基)-2,2′-二酮(代号为 S10)和(E)-6、成功设计、合成并充分表征了(E)-6, 6′-二(9H-咔唑-9-基)-1,1′-双(2-乙基己基)-(3,3′-双吲哚啉亚基)-2,2′-二酮(代号为 S11)。S10 和 S11 基于供体-受体-供体结构模式,分别含有一个共同的电子受体分子异靛蓝和不同的电子供体官能团三苯胺和咔唑。紫外-可见吸收光谱显示,与咔唑类似物相比,使用三苯胺供体功能增强了分子内的电荷转移转变,并减小了光带隙。这两种材料都被设计为供体半导体元件,在普通有机溶剂中具有极佳的溶解性,热稳定性也很好,其良好的光电特性促使我们利用可溶液加工的有机场效应晶体管仔细研究电荷载流子迁移率。使用 S10 和 S11 作为活性材料,分别测得了 2.2 × 10-4 cm2/Vs 和 7.8 × 10-3 cm2/Vs 的空穴迁移率。