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6 results on '"Yusup Jung"'

1. Temperature-Dependent Self-Powered Solar-Blind Photodetector Based on Ag2O/β-Ga2O3 Heterojunction

Author

Taejun Park, Sangbin Park, Joon Hui Park, Ji Young Min, Yusup Jung, Sinsu Kyoung, Tai Young Kang, Kyunghwan Kim, You Seung Rim, and Jeongsoo Hong

Subjects
Ag2O/β-Ga2O3, heterojunction, deep ultraviolet, photodetector, post-annealing, Chemistry, QD1-999
Abstract

In this study, a high-photoresponsivity self-powered deep ultraviolet (DUV) photodetector based on an Ag2O/β-Ga2O3 heterojunction was fabricated by depositing a p-type Ag2O thin film onto an n-type β-Ga2O3 layer. The device characteristics after post-annealing at temperatures ranging from 0 to 400 °C were investigated. Our DUV devices exhibited typical rectification characteristics. At a post-annealing temperature of 300 °C, the as-fabricated device had a low leakage current of 4.24 × 10−11 A, ideality factor of 2.08, and a barrier height of 1.12 eV. Moreover, a high photo-responsivity of 12.87 mA/W was obtained at a 100 μW/cm2 light intensity at a 254 nm wavelength at zero bias voltage, the detectivity was 2.70 × 1011 Jones, and the rise and fall time were 29.76, 46.73 ms, respectively. Based on these results, the Ag2O/β-Ga2O3 heterojunction photodetector operates without an externally applied voltage and has high responsivity, which will help in the performance improvement of ultraviolet sensing systems.

Published
2022
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3. Ag

Author

Sangbin, Park, Taejun, Park, Joon Hui, Park, Ji Young, Min, Yusup, Jung, Sinsu, Kyoung, Tai-Young, Kang, Kyung Hwan, Kim, You Seung, Rim, and Jeongsoo, Hong

Abstract

Self-powered deep-ultraviolet photodetectors have received considerable attention in recent years because of their efficiency, reliability, and various applications in civilian and military fields. Herein, a Ag/Ag

Published
2022

5. Measurement, Simulation and Mathematical Estimation of Magnetic Field Shielding Effectiveness of Sputtered Shielding Materials using Spiral Coils

Author

Kyumin Han, Kyunghwan Song, Hongseok Kim, Kyungjune Son, Dong-Hyun Kim, Subin Kim, Yusup Jung, Joungho Kim, Heo Jin, and Seungtaek Jeong

Subjects
Materials science, Sputtering, EMI, Acoustics, Electromagnetic shielding, Electronics, Semiconductor device, Electromagnetic interference, Spiral, Magnetic field
Abstract

Recently, semiconductor devices are becoming more diverse and scaled down for various applications such as electronic devices, communication systems and automotive components. Such applications can utilize sputtered shielding structures to solve electromagnetic interference (EMI) issues. To reduce the EMI issues, copper and nickel are commonly used as sputtered shielding materials. To analyze the shielding effectiveness, we applied the Schelkunoff's theory. For the verification of the Schelkunoff's theory, we simulated and measured the shielding effectiveness of copper and nickel at the frequency range between 100 kHz and 10 MHz using two identical coils.

Published
2018

6. Measurement and comparative analysis of shielding effectiveness of different sputtered materials

Author

Dong-Hyun Kim, Subin Kim, Hongseok Kim, Kyunghwan Song, Yeonje Cho, Yusup Jung, Bong Suk Kim, Joungho Kim, Heo Jin, and Seungtaek Jeong

Subjects
Materials science, business.industry, Amplifier, Electrical engineering, 020206 networking & telecommunications, 02 engineering and technology, Integrated circuit, 01 natural sciences, Electromagnetic interference, law.invention, 010309 optics, Sputtering, law, 0103 physical sciences, Electromagnetic shielding, 0202 electrical engineering, electronic engineering, information engineering, Optoelectronics, Insertion loss, Electronics, business, Electronic circuit
Abstract

Recently, high density integrated circuits are packaged in the electronic devices such as smartphones and smartwatches. Power amplifier modules integrated in such devices interact with other circuits due to its inductive components, and may cause the electromagnetic interference issues. To reduce the electromagnetic issues, sputtering technology can be used. In this paper, we present the shielding effectiveness measurement results of sputtered shielding materials in the low-frequency range from 30 kHz to 20 MHz using a vector network analyzer. Sputtered shielding materials are copper, nickel, titanium and stainless steel. By comparing the insertion loss, the shielding effectiveness is analyzed. The effect of the sputtered materials' thickness is also analyzed. Among the four materials, sputtered copper has the highest shielding effectiveness.

Published
2017

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