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Tunable Charge Transport Using Heterocycles-Flanked Alkoxyphenanthrenes for High-Performing OFETs

Year: 2024

Type: article

Abstract: High Resolution Image Download MS PowerPoint Slide A series of new heterocycles-flanked alkoxyphenanthrenes with D′-D-D′ and A-D-A architecture was synthesized for high-performance solution-processable p -channel, n -channel, and ambipolar organic field-effect transistors. The impact of electron-donating and -accepting abilities of the sulfur- and nitrogen-containing heteroaromatics on photophysical, electrochemical, and semiconducting properties was analyzed. The presence of heteroaryl rings improves the extended conjugation, two-dimensional lattices of π–π stacks, and increased molecular interaction of the functionalized phenanthrenes ( PN ) to allow better self-assembly. The electronically dynamic PN self-assembles into continuous microdomains, forming percolation channels for holes, electrons, or both reliant on functionalization. The low-lying LUMO levels of the compounds enabled ambipolar transport and reduced energy levels for charge injections. Spin-coated devices fabricated using functionalized PN with sulfur-containing heteroaryl substituted PN exhibited the highest hole mobility of 0.85 cm 2 /(V s) with 10 8 on/off current ratio. Compounds with A-D-A architecture showed n-channel/ambipolar charge transport, especially napthalimide acceptor substituted PN exhibited n-channel electron mobility of 0.78 cm 2 /(V s) and an on/off ratio of 10 6 . X-ray diffraction and scanning electron microscopy studies further delineate the impact of efficient packing in the film. Quantum chemistry calculations combined with Marcus–Hush electron transfer theory interpret the transport parameters, and heteroatoms are established to impact the charge mobility intensely.

Source: ACS Omega

DOI: 10.1021/acsomega.4c01166

Authors: Balu Balambiga, Panneerselvam Devibala, Predhanekar Mohamed Imran, Samuthira Nagarajan

Institution: Central University of Tamil Nadu

Language: English

Topic: Organic Electronics and Photovoltaics

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,935

Funder: Department of Science and Technology, Ministry of Science and Technology, India