Single Crystal X-ray, AFM, NEXAFS, and OFET Studies on Angular Polycyclic Aromatic Silyl-Capped 7,14-Bis(ethynyl)dibenzo[b,def]chrysenes

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• 作者：Kerry B. Burke ; Ying Shu ; Peter Kemppinen ; Birendra Singh ; Mark Bown ; Irving I. Liaw ; Rachel M. Williamson ; Lars Thomsen ; Paul Dastoor ; Warwick Belcher ; Craig Forsyth ; Kevin N. Winzenberg ; Gavin E. Collis
• 刊名：Crystal Growth & Design
• 出版年：2012
• 出版时间：February 1, 2012
• 年：2012
• 卷：12
• 期：2
• 页码：725-731
• 全文大小：401K
• 年卷期：v.12,no.2(February 1, 2012)
• ISSN：1528-7505

文摘

The impact of molecular packing and alignment of 7,14-bis((triethylsilyl)ethynyl)dibenzo[b,def]chrysene (TES-DBC) and 7,14-bis((triisopropylsilyl)ethynyl)dibenzo[b,def]chrysene (TIPS-DBC) on OFET performance was investigated. The bulk solid state packing of these angular polycyclic aromatic hydrocarbons (PAHs) was analyzed via single crystal X-ray analysis, and their molecular stacking arrangements on HMDS modified SiO₂ substrate were studied using near edge X-ray absorption fine structure spectroscopy (NEXAFS) at the carbon K-edge. Our studies found that TES- and TIPS-DBC have significantly different solid state packing arrangements and tilt angles, yet have OFET mobilities that are comparable at 1.6 脳 10^鈥? and 1.0 脳 10^鈥? cm²/Vs, respectively. The deposition method also has a dramatic impact on film morphology.