N, N′-Dihydrotetraazapentacenes (DHTA) in thin film transistors. Issue 7 (9th January 2015)

• Record Type: Journal Article
• Authors: Paulus, Fabian; Lindner, Benjamin D.; Reiß, Hilmar; Rominger, Frank; Leineweber, Andreas; Vaynzof, Yana; Sirringhaus, Henning; Bunz, Uwe H. F.
• Is Part Of: Journal of materials chemistry. Volume 3:Issue 7(2015)
• Page Start: 1604
• Page End: 1609
• Publication Date: 2015-01-09
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c4tc02426e
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : N, N ′-Dihydrotetraazapentacenes exhibit different polymorphs in spin cast thin films than in solution grown crystals and show interesting hole conducting properties with mobilities up to 0.11 cm 2 V −1 s −1 . Abstract : The synthesis and structural properties of three N, N ′-dihydrotetraazapentacenes (DHTA ) are described. The different substitution pattern (H, F, Cl) of the dihydrotetraazapentacene body exhibited a significant effect on the optical, electronic and morphological properties of the derivatives in thin films. The synthesised materials were investigated as active layers in top gate/bottom contact (BC/TG) transistors. The transistor performance of the dichlorinated derivative was almost independent on the processing conditions with an average hole mobility of ∼0.04 cm 2 V −1 s −1 and best mobility values ranging from 0.07 to 0.11 cm 2 V −1 s −1 . Each of the three derivatives was found to exhibit an individual packing motif in solution grown crystals, determined by single crystal X-ray analysis. Surprisingly, for all three materials a different polymorph formed in spin cast films explaining the observed morphology and FET performance.