Volume 26, Issue 49 p. 11135-11140
Communication

Directed Self-Organization Ensured Enhancement of Charge Carrier Mobilities in a Star-Shaped Organic Semiconductor

Srikanth Birudula

Srikanth Birudula

Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, Nadia, West Bengal, 741246 India

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Dr. Deepak D. Prabhu

Dr. Deepak D. Prabhu

Photosciences and Photonics, Chemical Science and Technology Division, NIIST (CSIR), Trivandrum, 695019 India

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Tapan Ghosh

Tapan Ghosh

Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, Nadia, West Bengal, 741246 India

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Adara B.

Adara B.

Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, Nadia, West Bengal, 741246 India

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Dr. Suresh Das

Dr. Suresh Das

Photosciences and Photonics, Chemical Science and Technology Division, NIIST (CSIR), Trivandrum, 695019 India

School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Vithura, Thiruvananthapuram, 695551 India

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Dr. Ratheesh K. Vijayaraghavan

Corresponding Author

Dr. Ratheesh K. Vijayaraghavan

Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, Nadia, West Bengal, 741246 India

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First published: 19 May 2020
Citations: 3

Graphical Abstract

Be direct! Directed self-assembly of FDT-8 on polar substrates leads to a desired molecular stack yielding a hexagonal columnar arrangement. The resulted molecular arrangement led to a drastic enhancement in charge carrier mobility measured using single-carrier diodes. A balanced charge carrier mobility was observed and a bilayer EL device was demonstrated using FDT-8.

Abstract

Controlled self-organization of organic semiconductor molecules into specifically desired architectures on substrates of interest is one of the most imperative challenges faced in the fabrication of high-performance organic electronic devices. Herein, we report the self-organization of a star-shaped molecule FDT-8 into a highly favored structure, namely, a vertical stack. Thermal annealing of films of FDT-8 deposited on PEDOT: PSS coated ITO substrates was observed to assist the organization of the molecules into columnar stacks. A significant enhancement in the hole (≈50-fold) and the electron (≈13-fold) carrier mobility was observed in single-carrier devices upon thermal annealing that could be attributed to the aforementioned self-organization. The ability of these molecules to spontaneously self-organize was utilized to fabricate bilayer light-emitting devices.