Article

Article

Curr. Appl. Phys. 2020; 20(12): 1359-1365

Published online December 31, 2020 https://doi.org/10.1016/j.cap.2020.08.015

Copyright © The Korean Physical Society.

Effects of UV-ozone treatment on the electronic structures of F8BT and PFO polymeric thin films

Choi S., Kim W., Shin W., Oh J., Jin S., Jung Y.M., Ryu M.-Y., Lee H.

Department of Physics, Kangwon National University, 1 Gangwondaehak-gil, Chuncheon-si, Gangwon-do 24341, South Korea; Institute for Accelerator Science, Kangwon National University, 1 Gangwondaehak-gil, Chuncheon-si, Gangwon-do 24341, South Korea; Department of Chemistry, Kangwon National University, 1 Gangwondaehak-gil, Chuncheon-si, Gangwon-do 24341, South KoreaChoi, S., Department of Physics, Kangwon National University, 1 Gangwondaehak-gil, Chuncheon-si, Gangwon-do 24341, South Korea, Institute for Accelerator Science, Kangwon National University, 1 Gangwondaehak-gil, Chuncheon-si, Gangwon-do 24341, South Korea; Kim, W., Department of Physics, Kangwon National University, 1 Gangwondaehak-gil, Chuncheon-si, Gangwon-do 24341, South Korea, Institute for Accelerator Science, Kangwon National University, 1 Gangwondaehak-gil, Chuncheon-si, Gangwon-do 24341, South Korea; Shin, W., Department of Physics, Kangwon National University, 1 Gangwondaehak-gil, Chuncheon-si, Gangwon-do 24341, South Korea, Institute for Accelerator Science, Kangwon National University, 1 Gangwondaehak-gil, Chuncheon-si, Gangwon-do 24341, South Korea; Oh, J., Department of Physics, Kangwon National University, 1 Gangwondaehak-gil, Chuncheon-si, Gangwon-do 24341, South Korea; Jin, S., Institute for Accelerator Science, Kangwon National University, 1 Gangwondaehak-gil, Chuncheon-si, Gangwon-do 24341, South Korea, Department of Chemistry, Kangwon National University, 1 Gangwondaehak-gil, Chuncheon-si, Gangwon-do 24341, South Korea; Jung, Y.M., Institute for Accelerator Science, Kangwon National University, 1 Gangwondaehak-gil, Chuncheon-si, Gangwon-do 24341, South Korea, Department of Chemistry, Kangwon National University, 1 Gangwondaehak-gil, Chuncheon-si, Gangwon-do 24341, South Korea; Ryu, M.-Y., Department of Physics, Kangwon National University, 1 Gangwondaehak-gil, Chuncheon-si, Gangwon-do 24341, South Korea; Lee, H., Department of Physics, Kangwon National University, 1 Gangwondaehak-gil, Chuncheon-si, Gangwon-do 24341, South Korea, Institute for Accelerator Science, Kangwon National University, 1 Gangwondaehak-gil, Chuncheon-si, Gangwon-do 24341, South Korea

Correspondence to:Lee, H.
Department of PhysicsSouth Korea
email: hyunbok@kangwon.ac.kr

Abstract

The property changes of polymeric films upon degradation are important to develop strategies to prolong the device lifetimes. In this regard, we investigated the effects of ultraviolet-ozone (UVO) treatment on the electronic structures of poly (9,9-dioctylfluorene-alt-benzothiadiazole) (F8BT) and poly (9,9-di-n-octylfluorenyl-2,7-diyl) (PFO) films. We found that as the UVO treatment time increased, the intensities of the UV–vis and photoluminescence spectra of both F8BT and PFO films exponentially decayed owing to the destruction of the conjugated system of the films. As per the X-ray photoelectron spectra, both the F8BT and PFO films showed significant oxidation and p-doping effects upon UVO treatment. In addition, UVO treatment caused the etching of the polymeric films, and their thickness gradually decreased; the etching rate with UVO treatment was faster for PFO than for F8BT. These results indicate that the functionalization of polymers with UVO treatment requires the careful consideration of the resulting changes in their electronic structure. © 2020 Korean Physical Society

Keywords: F8BT, PFO, UV-Ozone treatment, XPS

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