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High‐Performance and Stable Organic Thin‐Film Transistors Based on Fused Thiophenes
Author(s) -
Sun Y. M.,
Ma Y. Q.,
Liu Y. Q.,
Lin Y. Y.,
Wang Z. Y.,
Wang Y.,
Di C. A.,
Xiao K.,
Chen X. M.,
Qiu W. F.,
Zhang B.,
Yu G.,
Hu W. P.,
Zhu D. B.
Publication year - 2006
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200500547
Subject(s) - materials science , thiophene , differential scanning calorimetry , thermal stability , microcrystalline , thin film transistor , thermogravimetric analysis , scanning electron microscope , thin film , organic semiconductor , gravimetric analysis , photoluminescence , chemical engineering , organic electronics , analytical chemistry (journal) , optoelectronics , nanotechnology , transistor , crystallography , organic chemistry , composite material , layer (electronics) , chemistry , physics , engineering , thermodynamics , voltage , quantum mechanics
Abstract A series of new organic semiconductors for organic thin‐film transistors (OTFTs) using dithieno[3,2‐ b :2′,3′‐ d ]thiophene as the core are synthesized. Their electronic and optical properties are investigated using scanning electron microscopy (SEM), X‐ray diffraction (XRD), UV‐vis and photoluminescence spectroscopies, thermal gravimetric analysis (TGA), and differential scanning calorimetry (DSC). The compounds exhibit an excellent field‐effect performance with a high mobility of 0.42 cm 2 V –1 s –1 and an on/off ratio of 5 × 10 6 . XRD patterns reveal these films, grown by vacuum deposition, to be highly crystalline, and SEM reveals well‐interconnected, microcrystalline domains in these films at room temperature. TGA and DSC demonstrate that the phenyl‐substituted compounds possess excellent thermal stability. Furthermore, weekly shelf‐life tests (under ambient conditions) of the OTFTs based on the phenyl‐substituted compounds show that the mobility for the bis(diphenyl)‐substituted thiophene was almost unchanged for more than two months, indicating a high environmental stability.