Alkyl Chain Orientations in Dicyanomethylene‐Substituted 2, 5‐Di(thiophen‐2‐yl)thieno‐[3, 2‐b]thienoquinoid: Impact on Solid‐State and Thin‐Film Transistor Performance. (2nd December 2012)

• Record Type: Journal Article
• Authors: Wu, Qinghe; Ren, Shendong; Wang, Mao; Qiao, Xiaolan; Li, Hongxiang; Gao, Xike; Yang, Xiaodi; Zhu, Daoben
• Is Part Of: Advanced functional materials. Volume 23:Number 18(2013)
• Page Start: 2277
• Page End: 2284
• Publication Date: 2012-12-02
• Subjects: Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.201202744
• Languages: English
• ISSNs: 1616-301X

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>A series of dicyanomethylene‐substituted 2, 5‐di(thiophen‐2‐yl)thieno[3, 2‐b]thieno‐quinoids, in which soluble alkyl chains (2‐decyltetradecyls) are substituted at different positions (namely, 2, 2′‐positions (Compound <bold>1</bold>); 3, 3′‐ positions (Compound <bold>2</bold>); 6, 6′‐positions (Compound <bold>3</bold>)), are strategically designed and successfully synthesized. The photophysical and electrochemical properties as well as molecular packing of these new compounds are thoroughly investigated. Thin film transistor measurements reveal that Compounds <bold>1–3</bold> display markedly different charge transport performance. The solution processed thin film transistors of <bold>Compound 2</bold> exhibits the highest electron mobility of up to 0.22 cm² V⁻¹ s⁻¹ under ambient conditions, one and three orders of magnitude higher than those of Compounds <bold>3</bold> and <bold>1, </bold> respectively, demonstrating the strong impact of alkyl chain orientations on transistor performance.</p> </abstract>