首页|Effects of bromination on anthryl-capped DPP-based semiconductor materials: Improved electrical characteristics of organic field-effect transistors

Effects of bromination on anthryl-capped DPP-based semiconductor materials: Improved electrical characteristics of organic field-effect transistors

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  • NSTL
  • Elsevier
? 2022 Elsevier B.V.Diketopyrrolopyrrole (DPP), typically flanked with thiophene rings as π-spacers, has been regarded as a promising electron-acceptor unit for constructing donor-acceptor-donor (D-A-D) type small molecule organic semiconductors. Exploring the relationships between its conjugation structure and semiconducting property is of great importance for both molecular design and device fabrication of such DPP materials. Herein we describe the synthesis, self-assembly, and transistor characteristics of two novel N- and N′? 2-octyldodecylated DPP derivatives which were modified with native anthracene (An) and brominated anthracene (Br-An) at 5-, 5′-position of the flanked thiophenes, respectively, namely An-DPP and Br-An-DPP. Attributing to the self-assembly behaviors, they exhibit enormous difference in hole transport characteristics on interdigitated-electrode based organic field-effect transistor (OFET) devices even though there is only two atoms’ discrepancy in accordance with their molecular structures. The characterization of OFETs with interdigitated-electrodes based on Br-An-DPP reveals p-channel operation with highest ?eld-effect mobility of 0.2 cm2·V?1·s?1, which is 107 times higher than that of An-DPP (4.8 × 10?8 cm2·V?1·s?1), and with a threshold voltage of - 2.5 V. X-ray diffraction, atomic force microscopy, scanning electron microscopy, and optical absorption studies reveal the presence of crystalline films caused by bromination on anthracene-modified alkylated DPP (i.e., Br-An-DPP), while An-DPP exhibits completely amorphous phase.

AnthraceneDiketopyrrolopyrroleOrganic field-effect transistorsSemiconductor devicesSmall molecules

Xu W.、Wu J.、Yu D.、Aryal U.K.、Madsen M.、Kjelstrup-Hansen J.、Cao Z.

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Department of Chemistry and Bioscience Aalborg University

SDU NanoSYD Mads Clausen Institute University of Southern Denmark

Hunan Provincial Key Laboratory of Materials Protection for Electric Power & Transportation and Hunan Provincial Key Laboratory of Cytochemistry School of Chemistry and Chemical Engineering Changsha University of Science and Technology

2022

10.1016/j.synthmet.2022.117153

Synthetic Metals

Synthetic Metals

EISCI
ISSN：0379-6779
年,卷(期)：2022.290
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