Self-assembled dipoles of o-carborane on gate oxide tuning charge carriers in organic field effect transistors

Ming Chu; Jie Zhang; Xingwei Zeng; Zefeng Chen; Danqing Liu; Han Chen; Zuowei Xie; Jianbin Xu; Qian Miao

doi:10.1039/D1TC02810C

Self-assembled dipoles of o-carborane on gate oxide tuning charge carriers in organic field effect transistors†‡

Ming Chu,^a Jie Zhang,^a Xingwei Zeng,^a Zefeng Chen,^b Danqing Liu,

^c Han Chen,^a Zuowei Xie,

^a Jianbin Xu^b and Qian Miao

*^a

Author affiliations

* Corresponding authors

^a Department of Chemistry, The Chinese University of Hong Kong, New Territories, Shatin, Hong Kong, China
E-mail: miaoqian@cuhk.edu.hk

^b Department of Electronic Engineering, The Chinese University of Hong Kong, New Territories, Shatin, Hong Kong, China

^c Shenzhen Key Laboratory of Polymer Science and Technology, College of Materials Science and Engineering, Shenzhen University, Shenzhen, China

Abstract

Molecules of 12-o-carboranyldodecylphosphonic acid form a novel self-assembled monolayer (SAM) on alumina, which can effectively tune charge carriers in organic field effect transistors (OFETs) with the assembled dipoles of o-carborane at the semiconductor–dielectric interface. This SAM has not only realized p-channel OFETs of pentacene with both low threshold voltage and high field effect mobility (up to 5.2 cm² V⁻¹ s⁻¹), but also enabled ambipolar charge transport in the solution-processed thin films of a chlorinated tetraazapentacene, which is a typical n-type organic semiconductor. As measured with Kelvin probe force microscopy, the SAM of CBPA has a surface electrostatic potential of −0.40 ± 0.10 V versus gold, which is in agreement with the observed shift of threshold voltage in the OFETs.

This article is part of the themed collection: Special issue in honour of Daoben Zhu

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DOI: https://doi.org/10.1039/D1TC02810C
Article type: Paper
Submitted: 17 Jun 2021
Accepted: 20 Aug 2021
First published: 23 Aug 2021

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J. Mater. Chem. C, 2022,10, 2690-2695

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Self-assembled dipoles of o-carborane on gate oxide tuning charge carriers in organic field effect transistors

M. Chu, J. Zhang, X. Zeng, Z. Chen, D. Liu, H. Chen, Z. Xie, J. Xu and Q. Miao, J. Mater. Chem. C, 2022, 10, 2690 DOI: 10.1039/D1TC02810C

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Journal of Materials Chemistry C

Self-assembled dipoles of o-carborane on gate oxide tuning charge carriers in organic field effect transistors†‡

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Self-assembled dipoles of o-carborane on gate oxide tuning charge carriers in organic field effect transistors

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