Flexible, ambipolar organic field-effect transistors based on the solution-processed films of octanaphthoxy-substituted bis(phthalocyaninato) europium. (April 2015)

• Record Type: Journal Article
• Authors: Kong, Xia; Jia, Qi; Wu, Fanghua; Chen, Yanli
• Is Part Of: Dyes and pigments. Volume 115(2015)
• Page Start: 67
• Page End: 72
• Publication Date: 2015-04
• Subjects: Phthalocyanine -- Double-decker -- Solution-based film -- Ambipolar -- Flexible OFET -- PMMA; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2014.12.002
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: A new sandwich-type bis(phthalocyaninato) europium complex [Pc(OAr)8 ]Eu[Pc(OAr)8 ] [Pc(OAr)8 = 2, 3, 9, 10, 16, 17, 23, 24-octanaphthoxy phthalocyanine], was synthesized and fabricated into organic field-effect transistors devices on a flexible plastic substrate by using a simple solution-based quasi–Langmuir–Shäfer method. Ambipolar transport has been obtained in [Pc(OAr)8 ]Eu[Pc(OAr)8 ]-based thin film transistors with the carrier mobilities to 0.10 cm 2 V −1 s −1 for holes and 0.01 cm 2 V −1 s −1 for electrons, respectively. The energy levels of the highest occupied molecular orbital (−4.63 eV) and the lowest unoccupied molecular orbital (−3.41 eV) were obtained based on electrochemical studies of this double-decker complex. These values just simultaneously meet the energy levels required for p -type and n -type natures of organic semiconductors, suggesting the ambipolar organic semiconducting nature of this double-decker complex. Organized film microstructures and J -type molecular stacking mode for the double-decker complex in the quasi–Langmuir–Shäfer film are revealed. This study constitutes the first attempt to fabricate low-cost, flexible ambipolar phthalocyanine-based organic field-effect transistors by using simple solution-processing methods. Graphical abstract: Flexible, ambipolar OFETs based on the solution-processed QLS films of a new bis(phthalocyaninato) europium complex are obtained with the carrier mobilities of 0.10 cm 2 V −1 s −1 for holes and 0.01 cm 2 V −1 s −1 for electrons, respectively. Highlights: A new sandwich-type bis(phthalocyaninato) europium complex was synthesized. First example to fabricate flexible OFETs by a simple quasi–Langmuir–Shäfer method. Good ambipolar transport for both holes and electrons has been obtained.