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고에너지 전고체 전해질을 위한 나노스케일 이종구조 계면 특성
황성원 한국반도체디스플레이기술학회 2023 반도체디스플레이기술학회지 Vol.22 No.1
Recently, the use of stable lithium nanostructures as substrates and electrodes for secondary batteries can be a fundamental alternative to the development of next-generation system semiconductor devices. However, lithium structures pose safety concerns by severely limiting battery life due to the growth of Li dendrites during rapid charge/discharge cycles. Also, enabling long cyclability of high-voltage oxide cathodes is a persistent challenge for all-solid-state batteries, largely because of their poor interfacial stabilities against oxide solid electrolytes. For the development of next-generation system semiconductor devices, solid electrolyte nanostructures, which are used in high-density micro-energy storage devices and avoid the instability of liquid electrolytes, can be promising alternatives for next-generation batteries. Nevertheless, poor lithium ion conductivity and structural defects at room temperature have been pointed out as limitations. In this study, a low-dimensional Graphene Oxide (GO) structure was applied to demonstrate stable operation characteristics based on Li+ ion conductivity and excellent electrochemical performance. The low-dimensional structure of GO-based solid electrolytes can provide an important strategy for stable scalable solid-state power system semiconductor applications at room temperature. The device using uncoated bare NCA delivers a low capacity of 89 mA h g−1, while the cell using GO-coated NCA delivers a high capacity of 158 mA h g−1 and a low polarization. A full Li GO-based device was fabricated to demonstrate the practicality of the modified Li structure using the Li-GO heterointerface. This study promises that the low-dimensional structure of Li-GO can be an effective approach for the stabilization of solid-state power system semiconductor architectures.
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InGaN/GaN Micro-LED구조를 위한 그래핀 양자점 기반의 산화막 기판 특성
황성원,Hwang, Sung Won 한국반도체디스플레이기술학회 2021 반도체디스플레이기술학회지 Vol.20 No.3
The core-shell InGaN/GaN Multi Quantum Well-Nanowires (MQW-NWs) that were selectively grown on oxide templates with perfectly circular hole patterns were highly crystalline and were shaped as high-aspect-ratio pyramids with semi-polar facets, indicating hexagonal symmetry. The formation of the InGaN active layer was characterized at its various locations for two types of the substrates, one containing defect-free MQW-NWs with GQDs and the other containing MQW-NWs with defects by using HRTEM. The TEM of the defect-free NW showed a typical diode behavior, much larger than that of the NW with defects, resulting in stronger EL from the former device, which holds promise for the realization of high-performance nonpolar core-shell InGaN/GaN MQW-NW substrates. These results suggest that well-defined nonpolar InGaN/GaN MQW-NWs can be utilized for the realization of high-performance LEDs.
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고성능 이차전지를 위한 탄소복합체 나노구조 이종 전극계면 특성
황성원,조태경 한국반도체디스플레이기술학회 2024 반도체디스플레이기술학회지 Vol.23 No.4
The composite was manufactured by mixing graphene quantum dots (GQDs) , silicon oxide, and carbon nanoparticles, and the characteristics of the anode materials for secondary batteries were examined. To improve the capacity of the GQD anode material, the added GQD content was varied among 1 and 3 wt%, and carbon nanoparticles were added as a structural stabilizer to alleviate silicon oxide volume expansion. The physical properties of the prepared GQD/SiOx/C composite were investigated through EIS, SEM, and resistance analysis. Additionally, the electrochemical properties of the manufactured composite were observed through an analysis of the charge–discharge cycle, rate, and impedance of a lithium secondary battery. In the GQD/SiOx/C composite, by adding carbon nanoparticles, an internal cavity was formed that can alleviate the volume expansion of silicon oxide, and the carbon nanoparticles and silicon oxide particles were uniformly distributed. The formed internal cavity had a silicon oxide content of 10 wt%. Low initial efficiency was observed, and above 15 wt%, high cycle stability was observed. The GQD/SiOx/C composite with 15 wt% of silicon oxide added showed an initial discharge capacity of 597 mAh/g, a capacity retention rate of 96.5%, and a rate characteristic of 90 at 2 C/0.1 C. Silicon oxide was added to improve the capacity of the anode material, and carbon nanoparticles were added as a structural stabilizer to buffer the volume change of the silicon oxide. To use GQD/SiOx/C composite as a highly efficient anode material, the optimal silicon oxide content and carbon nanoparticle mechanism as a structural stabilizer were discussed.
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PVP GQD / HfOx 구조를 갖는 전도성 필라멘트 기반의 저항성 스위칭 소자 특성
황성원,Hwang, Sung Won 한국반도체디스플레이기술학회 2021 반도체디스플레이기술학회지 Vol.20 No.1
A composite active layer was designed based on graphene quantum dots, which is a low-dimensional structure, and a heterogeneous active layer of graphene quantum dots was applied to the interfacial defect structure to overcome the limitations. Increasing to 1.5~3.5 wt % PVP GQD, Vf changed from 2.16 ~ 2.72 V. When negative deflection is applied to the lower electrode, electrons travel through the HfOx/ITO interface. The Al + ions are reduced and the device dominates at low resistance. In addition, as the PVP GQD concentration increased, the depth of the interfacial defect decreased, and the repetition of appropriate electrical properties was confirmed through Al and HfOx/ITO. The low interfacial defects help electrophoresis of Al+ ions to the PVP GQD layer and the HfOx thin film. A local electric field increase occurred, resulting in the breakage of the conductive filament in the defect.
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공공부문에 효과적인 Action Learning 도입방안
황성원,김윤수,방극봉,이선우,이희열 한국행정연구원 2005 기본연구과제 Vol.2005 No.-
This study is dealt with action learning that is one of the means for government innovation through aggregate participation and action in the participatory government. Since action learning was proven to be successful in the GE of Jack Welch, it has been used many private companies in the advanced countries. Many private companies including CJ, LG etc. introduced action learning by means of business innovation since early 1990`s. Action leaning approach to organizational change and development can be operationalized. Action learning can be possible to realize education that is distributing organizational decision-making, to take a catalysis role that is embodying learning organization, to strengthen HRD competency. As a result of the study, first of all, it was suggested that basic principles, cases that used public and private sector, and a manual that is appliable to the public employee about action learning. This is the reason why public employees must need to understand action learning properly. secondly, the use of action learning depends on the organizational character. thirdly, action learning should be used by means of micro level as well as strategic level. fourthly, action learning needs to have enough money and term. fifthly, action learning is not work-study program or practical training, but it will change the organization as well as an individual behavior to be active.
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황성원,김용훈,김상태,민장근,손종호 한국행정연구원 2004 기본연구과제 Vol.2004 No.-
The purpose of this study is to develop more efficient and rational alternatives for the monitoring system on public service for the purpose of reflecting the voice of the people. Unfortunately the research on the monitoring in the public service is scarce. So this study give meaningful contribution to the academics, and the practical affairs in the administrative fields. In order to improve the monitoring system, firstly, the institutionalization of participatory path that the people can be easily accessble on public policy, secondly, the establishment of the system to monitor at all times that guarantee the policy effectiveness, thirdly, the provision of the substantial satisfaction with the policy result toward the people, fourthly, the development of the research on the monitoring in the public service. Accordingly, the study summarized that the monitoring in public service should be done perfect mutual dialogue as much as possible between the people and public employee in order to improving the monitoring system in public service
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