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Air-Stable n-channel Diketopyrrolopyrrole Diketopyrrolopyrrole Oligomers for High Performance Ambipolar Organic Transistors

Mukhopadhyay, Tushita and Puttaraju, Boregowda and Senanayak, Satyaprasad P and Sadhanala, Aditya and Friend, Richard and Faber, Hendrik A and Anthopoulos, Thomas D and Salzner, Ulrike and Meyer, Andreas and Patil, Satish (2016) Air-Stable n-channel Diketopyrrolopyrrole Diketopyrrolopyrrole Oligomers for High Performance Ambipolar Organic Transistors. In: ACS APPLIED MATERIALS & INTERFACES, 8 (38). pp. 25415-25427.

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Official URL: http://dx.doi.org/10.1021/acsami.6b08453


n-channel organic semiconductors are prone to oxidation upon exposed to ambient conditions. Herein, we report design and synthesis of dilcetopyrrolopyrrole (DPP)-based oligomers for ambipolar organic thin-film transistors (OFETs) with excellent air and bias stability at ambient conditions. The cyclic voltammetry measurements reveal exceptional electrochemical stability during the redox cycle of oligomers. Structural properties including aggregation, crystallinity, and morphology in thin film were investigated by UV-Visible spectroscopy, atomic force microscopy (AFM), thin-film X-ray-diffraction (XRD), and grazing incidence small-angle X-ray scattering (GISAXS) measurements. AFM reveals morphological changes induced by different processing conditions whereas GISAXS,measurements show an increase in the population offaceon oriented crystallites in films subjected to a combination of solvent and thermal treatments. These measurements also highlight the, significance of clialcogen atom from sulfur to selenium on the photophysical, optical, electronic, and solid-state properties Of DPP-DPP oligomers. Charge carrier mobilities of the oligomers were investigated by fabricating top-gate bottom-contact (TG-BC) thinfilm transistors by annealing the thin films under various conditions. Combined solvent and thermal annealing of DPP-DPP oligorner thin films results in consistent electron mobilities as high as similar to 0.2 cm(2) V-1 s(-1) with an on/off ratio exceeding 10(4). Fieldeffect behavior was retained for up to similar to 4 weeks, which illustrates remarkable air and bias stability. This work paves, the way toward, the development of n-channel DPP-DPP-based oligomers exhibiting retention of field-effect behavior with superior stability at ambient conditions.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 03 Dec 2016 06:25
Last Modified: 03 Dec 2016 06:25
URI: http://eprints.iisc.ac.in/id/eprint/55280

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