Issue 43, 2020

Impact of p-type doping on charge transport in blade-coated small-molecule:polymer blend transistors

Abstract

Blade-coating is a roll-to-roll (R2R) compatible processing technique and has the potential to address the industry's needs for scalable manufacturing of future organic electronics. Here we investigate the applicability of blade-coating for the fabrication of organic thin-film transistors (OTFTs) based on best-in-class organic semiconducting blends comprised of the conjugated small-molecule 2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene (C8-BTBT), and the conjugated polymer poly(indacenodithiophene-co-benzothiadiazole) (C16IDT-BT). We show that the operating characteristics of blade-coated transistors consistently outperform devices prepared via spin-coating, showcasing the compatibility of the technique. Introducing the molecular p-dopant C60F48 into the binary C8-BTBT:C16IDT-BT blend formulation, in combination with carefully optimized blade-coating conditions, helps to enhance the performance of the ensuing transistors further resulting in a maximum hole mobility of ≈14 cm2 V−1 s−1, and an all-around improvement of the device operating characteristics. Our results show that p-doped blend OTFTs can be manufactured using industry relevant processing techniques without sacrificing their state-of-the-art performance.

Graphical abstract: Impact of p-type doping on charge transport in blade-coated small-molecule:polymer blend transistors

Supplementary files

Article information

Article type
Paper
Submitted
30 jun. 2020
Accepted
03 sep. 2020
First published
03 sep. 2020
This article is Open Access
Creative Commons BY-NC license

J. Mater. Chem. C, 2020,8, 15368-15376

Impact of p-type doping on charge transport in blade-coated small-molecule:polymer blend transistors

A. Basu, M. R. Niazi, A. D. Scaccabarozzi, H. Faber, Z. Fei, D. H. Anjum, A. F. Paterson, O. Boltalina, M. Heeney and T. D. Anthopoulos, J. Mater. Chem. C, 2020, 8, 15368 DOI: 10.1039/D0TC03094E

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