Graphene-Induced Enhancement of n-Type Mobility in Perylenediimide Thin Films

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• 作者：Srinivasa Rao Pathipati ; Egon Pavlica ; Andrea Schlierf ; Mirella El Gemayel ; Paolo Samor矛 ; Vincenzo Palermo ; Gvido Bratina
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：October 30, 2014
• 年：2014
• 卷：118
• 期：43
• 页码：24819-24826
• 全文大小：373K
• ISSN：1932-7455

文摘

Organic thin-film transistor transfer characteristics and time-of-flight (TOF) photoconductivity measurements were used to investigate the effect of the addition of liquid-phase exfoliated graphene nanoflakes (GNs) on the electron mobility in thin films of N,N鈥?bis(1H,1H-perfluorobutyl)dicyanoperylenecarboxydiimide (PDIF-CN2). Transfer characteristics measurements reveal that the charge carrier mobility of PDIF-CN2 increases by almost 3 orders of magnitude via blending with GNs. TOF photocurrent measurements confirm that the GNs improve the charge carrier transport in PDIF-CN2. We have found a strong dependence of the TOF-determined electron mobility on the excitation wavelength and obtained a maximum mobility of 0.17 cm²/(V s) for charge carriers produced in GN:PDIF-CN2 blends using a photon energy of 5.9 eV. This value is in good agreement with the field-effect mobility of 0.2 cm²/(V s) determined from transfer characteristics.