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15 results on '"Cho, Soohaeng"'

1. Memory Characteristics of Anthracene-based Polyimides in Non-volatile Resistive Memory Devices

Author

Lee, Seung-Hyun, primary, Park, Sechang, additional, Choi, Ju-Young, additional, Choi, Yun-Je, additional, Ji, Hyung Woo, additional, Joung, Hyeyoung, additional, Kim, Dam-Bi, additional, Yoon, Kang-Hoon, additional, Ji, Gyumin, additional, Choi, Daeho, additional, Lee, Jaekang, additional, Paeng, Ki-Jung, additional, Yang, Jaesung, additional, Cho, Soohaeng, additional, and Chung, Chan-Moon, additional

Published
2023
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5. Highly Efficient, Flexible, and Recyclable Air Filters Using Polyimide Films with Patterned Thru-Holes Fabricated by Ion Milling

Author

Choi, Sang-Jun, primary, Kim, Kyung, additional, Kim, Hyun, additional, Yoon, Jun, additional, Lee, Mi, additional, Choi, Kyung-Suk, additional, Sung, Ung-Dae, additional, Park, Won-Taek, additional, Lee, Jeongjun, additional, Jeon, Jihyun, additional, Im, Jaehyuk, additional, Kim, Kyoung-Kook, additional, and Cho, Soohaeng, additional

Published
2019
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9. Electronic Structure of C60/Zinc Phthalocyanine/V2O5 Interfaces Studied Using Photoemission Spectroscopy for Organic Photovoltaic Applications.

Author

Lim, Chang Jin, Park, Min Gyu, Kim, Min Su, Han, Jeong Hwa, Cho, Soohaeng, Cho, Mann-Ho, Yi, Yeonjin, Lee, Hyunbok, and Cho, Sang Wan

Subjects
FULLERENES, ZINC phthalocyanine, VANADIUM pentoxide, MOLECULAR orbitals, INDIUM tin oxide
Abstract

The interfacial electronic structures of a bilayer of fullerene (C60) and zinc phthalocyanine (ZnPc) grown on vanadium pentoxide (V2O5) thin films deposited using radio frequency sputtering under various conditions were studied using X-ray and ultraviolet photoelectron spectroscopy. The energy difference between the highest occupied molecular orbital (HOMO) level of the ZnPc layer and the lowest unoccupied molecular orbital (LUMO) level of the C60 layer was determined and compared with that grown on an indium tin oxide (ITO) substrate. The energy difference of a heterojunction on all V2O5 was found to be 1.3~1.4 eV, while that on ITO was 1.1 eV. This difference could be due to the higher binding energy of the HOMO of ZnPc on V2O5 than that on ITO regardless of work functions of the substrates. We also determined the complete energy level diagrams of C60/ZnPc on V2O5 and ITO. [ABSTRACT FROM AUTHOR]

Published
2018
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14. Modeling of a Parameter to Evaluate Multilevel Operation of Bipolar Oxide Resistive Device.

Author

Choi, Sang-Jun, Kim, Ki-Hong, Yang, Woo-Young, and Cho, Soohaeng

Subjects
ELECTRIC resistors, OXIDES, ELECTRIC currents, ELECTRIC contactors, OXYGEN compounds
Abstract

We propose a simple and efficient model using a phenomenological fitting parameter for current-voltage sweeps to describe vacancy dynamics in oxide resistive devices, and thereby to explain the relation between physical state and resistance in these devices. The fitting parameter serves as a figure of merit, describing a device’s capability for multibit operation. The understanding achieved through this model allows efficient evaluation of device performance factors including the maximum ON/OFF ratio and the multiresistance property. [ABSTRACT FROM AUTHOR]

Published
2014
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15. Electronic Structure of C 60 /Zinc Phthalocyanine/V₂O₅ Interfaces Studied Using Photoemission Spectroscopy for Organic Photovoltaic Applications.

Author

Lim CJ, Park MG, Kim MS, Han JH, Cho S, Cho MH, Yi Y, Lee H, and Cho SW

Subjects
Isoindoles, Photoelectron Spectroscopy, Substrate Specificity, Tin Compounds chemistry, Zinc Compounds, Fullerenes chemistry, Indoles chemistry, Organometallic Compounds chemistry, Vanadium Compounds chemistry
Abstract

The interfacial electronic structures of a bilayer of fullerene (C 60 ) and zinc phthalocyanine (ZnPc) grown on vanadium pentoxide (V₂O₅) thin films deposited using radio frequency sputtering under various conditions were studied using X-ray and ultraviolet photoelectron spectroscopy. The energy difference between the highest occupied molecular orbital (HOMO) level of the ZnPc layer and the lowest unoccupied molecular orbital (LUMO) level of the C 60 layer was determined and compared with that grown on an indium tin oxide (ITO) substrate. The energy difference of a heterojunction on all V₂O₅ was found to be 1.3~1.4 eV, while that on ITO was 1.1 eV. This difference could be due to the higher binding energy of the HOMO of ZnPc on V₂O₅ than that on ITO regardless of work functions of the substrates. We also determined the complete energy level diagrams of C 60 /ZnPc on V₂O₅ and ITO., Competing Interests: The authors declare no conflict of interest.

Published
2018
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