Change in Interface Characteristics of ITO Modified with n-decyltrimethoxysilane

Myung-Gyun Baek,Sang-Geon Park,Dong-Hyun Hwang,Hong-Gyu Park,Johng-Eon Shin,Sung-Hoon Kim

doi:10.3390/cryst10080645

Myung-Gyun Baek, Sang-Geon Park + Show 4 more

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https://doi.org/10.3390/cryst10080645

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Journal: Crystals	Publication Date: Jul 27, 2020
Citations: 1	License type: CC BY 4.0

Affiliation: Silla University, Changwon National University

Abstract

Herein, we examined changes in the interfacial properties of organic light-emitting diodes when n-decyltrimethoxysilane (CH3SAM) was deposited on the surface of an indium tin oxide (ITO) electrode for various deposition times. It was revealed that the interfacial properties varied with deposition time. As the latter increased, so did the measured value of the contact angle, and ITO substrate exhibited a lower wettability. The contact angle measurements for bare ITO at 1, 10, 30, and 90 min were 57.41°, 63.43°, 73.76°, 81.47°, respectively, and the highest value obtained was 93.34°. In addition, the average roughness and work function of the ITO were measured using atomic force microscopy and X-ray photoelectron spectroscopy. As the deposition time of CH3SAM on the ITO substrates increased, it was evident that the former was well aligned with the latter, improving surface modification. The work function of CH3SAM, modified on the ITO substrates, improved by approximately 0.11 eV from 5.05–5.16 eV. The introduction of CH3SAM to the ITO revealed the ease of adjustment of the characteristics of ITO substrates.

Highlights

Organic light-emitting diodes (OLEDs) are light-emitting devices comprising multiple stacked layers of organic materials
In OLEDs, when electrons and holes generated by electric fields are applied to organic materials inserted between the anode and the cathode, light is emitted through electrostatic miraculous attraction [1]
Once the self-assembled monolayer (SAM) is present on the surface, the self-organization progresses in three phases

Summary

Introduction

Organic light-emitting diodes (OLEDs) are light-emitting devices comprising multiple stacked layers of organic materials. OLEDs have many advantages, including low power consumption, self-luminescence, wide viewing angle and full color, high reproducibility, ultra-thin, lightweight, fast response and the ability to drive with simple manufacturing processes. Due to these advantages, OLEDs have recently attracted attention as a promising high-tech development in the industrial sector [2,3]. Transparent conductive oxides (TCOs) with high transparency and low sheet resistance in visible light range (380–760 nm) have been widely used as transparent electrodes in optoelectronic devices [4,5].

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