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Issue 11, 2015
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Improved output characteristics of organic thin film transistors by using an insulator/protein overlayer and their applications

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Abstract

We herein present our study of the effect of an insulator/protein overlayer deposited onto semiconducting active layers in organic thin film transistors (OTFTs) with regard to their electrical performance. The active layers used were composed of 6,13-bis(triisopropylsilylethynyl)-pentacene (TIPS-PEN) blended with poly(α-methylstyrene) (PaMS), and the overlayer consisted of a bottom insulating (protecting) layer of an amorphous perfluoropolymer (Cytop) and a top protein layer of negatively charged bovine serum albumin (BSA). The functional layers were deposited using a simple solution-coating method which involved a horizontal dip coating process. We show that the Cytop/BSA overlayer on the TIPS-PEN:PaMS active layer improved the electrical performance of the OTFTs; the devices with the Cytop/BSA overlayer exhibited an average effective mobility of 0.25 cm2 V−1 s−1, which was higher than that of bare devices without any overlayer (0.20 cm2 V−1 s−1). This improved performance of OTFTs with the overlayer was successfully simulated and was found to stem from the formation of a second current channel in the TIPS-PEN:PaMS active layer via the electric field effect of the negatively charged BSA overlayer. These results demonstrate that OTFTs employing charged protein overlayers show considerable promise for the production of high-performance OTFT devices.

Graphical abstract: Improved output characteristics of organic thin film transistors by using an insulator/protein overlayer and their applications

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Publication details

The article was received on 09 Dec 2014, accepted on 25 Jan 2015 and first published on 27 Jan 2015


Article type: Paper
DOI: 10.1039/C4TC02823F
Author version available: Download Author version (PDF)
Citation: J. Mater. Chem. C, 2015,3, 2603-2613
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    Improved output characteristics of organic thin film transistors by using an insulator/protein overlayer and their applications

    J. Choi, H. G. Jeon, O. E. Kwon, I. Bae, J. Cho, Y. Kim and B. Park, J. Mater. Chem. C, 2015, 3, 2603
    DOI: 10.1039/C4TC02823F

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