논문 상세보기

KCI등재

할라이드 페로브스카이트 단결정

Halide Perovskite Single Crystals

최진산 ( Jin San Choi ) , 조재훈 ( Jae Hun Jo ) , 우도현 ( Do Hyun Woo ) , 황영훈 ( Young-hun Hwang ) , 김일원 ( Ill Won Kim ) , 김태헌 ( Tae Heon Kim ) , 안창원 ( Chang Won Ahn )
  • : 한국전기전자재료학회
  • : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권5호
  • : 연속간행물
  • : 2021년 09월
  • : 283-295(13pages)
전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.)

DOI


목차

1. 서 론
2. 할라이드 페로브스카이트 단결정 합성
3. 결론 및 전망
감사의 글
REFERENCES

키워드 보기


초록 보기

For the last decades, a research hotspot for the halide perovskites (HPs) is now showing great progress in terms of improving efficiency for numerous photovoltaic devices (PVDs). However, it still faces challenges in the case of long-term stability in the air atmosphere. Defect-free high-quality HP single crystals show their promising properties for the remarkable development of highly efficient and stable PVDs. Here, we summarize the growth processing routes for the stable HP single crystals as well as briefly discuss the pros and cons of those well-established synthesis routes. Furthermore, we briefly include the comparison note between the HP single crystals and polycrystalline perovskite films regarding their device applications. Based on the future progress, the review concludes subjective perspectives and current challenges for the development of HPs high-quality PVDs.

UCI(KEPA)

I410-ECN-0102-2022-500-000786195

간행물정보

  • : 공학분야  > 전기공학
  • : KCI등재
  • :
  • : 격월
  • : 1226-7945
  • : 2288-3258
  • : 학술지
  • : 연속간행물
  • : 1988-2022
  • : 4616


저작권 안내

한국학술정보㈜의 모든 학술 자료는 각 학회 및 기관과 저작권 계약을 통해 제공하고 있습니다.

이에 본 자료를 상업적 이용, 무단 배포 등 불법적으로 이용할 시에는 저작권법 및 관계법령에 따른 책임을 질 수 있습니다.

35권2호(2022년 03월) 수록논문
최근 권호 논문
| | | |

KCI등재

1MLCC용 유전체 소재의 연구개발 동향

저자 : 서인태 ( Intae Seo ) , 강형원 ( Hyung-won Kang ) , 한승호 ( Seung Ho Han )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 35권 2호 발행 연도 : 2022 페이지 : pp. 103-118 (16 pages)

다운로드

(기관인증 필요)

초록보기

With the recent increase in demand for electronic devices, multi-layer ceramic capacitors (MLCCs) have become the most important core component. In particular, the next-generation MLCC with extremely high reliability is required for the 4th industrial revolution and electric vehicle applications. Therefore, it is necessary to develop dielectric ceramic materials with high dielectric properties and reliability. During the decades, electrical properties of BaTiO3 based dielectric ceramics, which have been widely used in MLCC industrial field, have been improved by microstructure and defect chemistry control. However, electrical properties of BaTiO3 have reached their limits, and new types of dielectric materials have been widely studied. Based on these backgrounds, this report presents the recent development trends of BaTiO3-based dielectric materials for the nextgeneration MLCCs, and suggests promising candidates to replace BaTiO3 ceramics.

KCI등재

2유연한 열전소재를 이용한 에너지 하베스터 연구개발 동향

저자 : 박종민 ( Jong Min Park ) , 김서하 ( Seoha Kim ) , 나유진 ( Yujin Na ) , 박귀일 ( Kwi-il Park )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 35권 2호 발행 연도 : 2022 페이지 : pp. 119-128 (10 pages)

다운로드

(기관인증 필요)

초록보기

Recent advancement of Internet of Things (IoT) and energy harvesting technology enable realization of flexible thermoelectric energy harvester (f-TEH), with technological prowess for use in biomedical monitoring system integrated applications. To expand a flexible thermoelectric energy harvesting platform, the f-TEH must be required for optimized flexible thermoelectric materials and device structure. In response to these demands related to thermoelectric energy harvesting, many research groups have investigated various f-TEHs applied as a power source for wearable electronics. As a key member of the f-TEH, film-based f-TEHs possess significant applicability in research to realize self-powered wearable electronics, owing to their excellent flexibility, low thermal conductivity, and convenient fabrication process. Thus, based on the rapid growth of thermoelectric film technology, this review aims to overview comprehensively the f-TEH made of various inorganic/organic thermoelectric materials including developed fabrication methods, high thermoelectric performance, and wide-range applications.

KCI등재

32차원 탄소 나노 구조를 가진 그래핀 소재의 바이오 센서 및 태양전지 응용에 관한 연구 동향

저자 : 박형기 ( Hyeong Gi Park ) , 김승일 ( Seung-il Kim ) , 문지윤 ( Ji-yun Moon ) , 최준희 ( Jun-hui Choi ) , 현상화 ( Sang-hwa Hyun ) , 이재현 ( Jae-hyun Lee )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 35권 2호 발행 연도 : 2022 페이지 : pp. 129-133 (5 pages)

다운로드

(기관인증 필요)

초록보기

This paper describes why we must use graphene materials for solar cells and biosensors. It has been superior in several properties such as super-thin film, higher tensile strength, high current density, high thermal conductivity, and high mobility. Therefore, graphene is one of the emerging advanced materials because of its applicability in various electronic device applications. We investigated the requirements of graphene materials for the application of solar cells and biosensors. In addition, we discussed the research trends such as transducers in biosensors and transparent electrodes in solar cells. The research on graphene materials and their application will be beneficial and helpful for the near future.

KCI등재

4결정그래프 합성곱 인공신경망을 통한 소재의 생성 에너지 예측

저자 : 이현기 ( Hyun-gi Lee ) , 서동화 ( Dong-hwa Seo )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 35권 2호 발행 연도 : 2022 페이지 : pp. 134-142 (9 pages)

다운로드

(기관인증 필요)

초록보기

기존의 시행착오를 거쳐 소재를 개발하는 방법은 조금씩 한계를 보이고 있는데, 왜냐하면 산업과 기술이 고도화되고 기능성 소재가 가져야 하는 특성은 복잡해지면서 그 요구치가 높아지고 있기 때문이다. 이를 극복하기 위해 데이터 기반의 인공신경망으로 복잡한 소재 공간을 빠르게 탐색하여 소재 개발을 가속화하고자 하는 연구들이 진행되고 있다. 특히 결정그래프 합성곱 인공신경망은 결정 소재의 구조에 따른 특성을 학습하는 인공신경망으로 소재의 특성(생성 에너지, 밴드갭, 부피 탄성 계수 등)을 양자역학 기반의 제일원리 계산보다 빠르게 예측한다. 본 논문에서는 46,629개의 결정구조 데이터와 그 생성 에너지를 공공데이터베이스에서 불러와 결정그래프 합성곱 인공신경망 모델을 학습시키고 이를 특성 예측에 적용해 보는 예제를 설명한다. 이를 통해 간단한 프로그래밍 지식으로 소재 특성 예측모델을 재현해 보고 원하는 데이터 셋과 연구 분야에 적용할 수 있을 것으로 기대된다. 인공지능 모델의 개발은 앞으로 더 복잡한 특성을 가져야만 하는 소재의 개발을 위해 넓은 범위의 소재를 탐색해야만 하는 과정을 획기적으로 단축시켜 소재 개발의 가속화를 촉진시킬 것으로 생각된다.


As industry and technology go through advancement, it is hard to search new materials which satisfy various standards through conventional trial-and-error based research methods. Crystal Graph Convolutional Neural Network(CGCNN) is a neural network which uses material's features as train data, and predicts the material properties(formation energy, bandgap, etc.) much faster than first-principles calculation. This report introduces how to train the CGCNN model which predicts the formation energy using open database. It is anticipated that with a simple programming skill, readers could construct a model using their data and purpose. Developing machine learning model for materials science is going to help researchers who should explore large chemical and structural space to discover materials efficiently.

KCI등재

5영상기기의 EMC Debugging 기술

저자 : 송민종 ( Min-jong Song ) , 김진사 ( Jin-sa Kim )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 35권 2호 발행 연도 : 2022 페이지 : pp. 143-148 (6 pages)

다운로드

(기관인증 필요)

초록보기

For the purpose of treating health checkups and recovery of patients in a super-aged society, hospitals use devices designed with a reduction circuit of electromagnetic waves associated with the specific absorption rate of electromagnetic waves absorbed by the human body. In this paper, we proposed a filter improvement design method capable of reducing electromagnetic waves. As a result of confirming the validity of the proposed technique through simulation and experimental results, the following result values were obtained. Applying the common-mode (CM) inductor 4 mH to a calibration circuit, noise decreased in a multiband spectrum. Using the differential mode(DM) inductor 40 μH element in the primary calibration circuit, the noise decreased by 15 dB or more in the 3 MHz band spectrum. Also, applying the Admittance Capacitance (Y-Cap) 10 nF element in the secondary calibration circuit resulted in the decrease by more than 30 dB in the band spectrum before 2 MHz. After using a common-mode inductor 4 mH element in the tertiary calibration circuit, it decreased by more than 15 dB in the band spectrum after 2 MHz.

KCI등재

6실시간 미세플라스틱 카운팅을 위한 레이저 유도 형광 특성 분석

저자 : 고승현 ( Seunghyeon Ko ) , 오금윤 ( Geum-yoon Oh )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 35권 2호 발행 연도 : 2022 페이지 : pp. 149-154 (6 pages)

다운로드

(기관인증 필요)

초록보기

In this paper, laser-induced fluorescence properties of four plastics were characterized through spectrometer analysis for real-time microplastic counting. Recently, environmental problems related to microplastics have emerged. In order to detect microplastics, analysis methods such as FT-IR and Raman are used. However, they have the disadvantages of being timeconsuming and requiring a pretreatment process. In most plastic products on the market, 10% to 30% of plasticizers and reinforcing agents are added. Therefore, most microplastics present in seawater and freshwater emit fluorescence signals by 270 nm UV light source regardless of their type due to their molecular structure due to additives. Real-time microplastics counting is possible more easily by using the proposed laser-induced fluorescence detection method because of the fluorescence expression characteristic of 340 nm that appears due to the plasticizer of plastics.

KCI등재

7가금류 농장에 적용 가능한 이동식 중량 저울에 관한 연구

저자 : 박성진 ( Sung Jin Park ) , 박인지 ( In Ji Park ) , 김진영 ( Jin Young Kim )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 35권 2호 발행 연도 : 2022 페이지 : pp. 155-159 (5 pages)

다운로드

(기관인증 필요)

초록보기

Smart livestock, which combines information and communication technology (ICT) with livestock, can be said to be an effective solution to existing livestock problems such as productivity improvement, odors, and diseases. So far, it has hardly been universalized; thus, it is necessary to develop automation devices to reduce labor by localizing automation devices to expand the distribution of ICT technology to farms, and to advance precise specifications and health management technology using biometric information. Weighing scales currently being used in livestock farms are to prevent the spread of diseases by diagnosis and preparation for AI and other diseases in advance, using information on the growing weight of duck breeding. However, accurate values cannot be obtained due to poor breeding conditions. In this paper, we developed a separate data transmission system kit for the weighing scale and placed the sensor on top of the weighing scale so that the sensor wire is not affected by pollutants or ducks on the floor. A display function was provided, and a method of receiving and analyzing the serial port data of the weighing device, and then transmitting them to the data collection server was implemented.

KCI등재

8제어 및 모니터링을 위한 스마트 키오스크 개발

저자 : 김진사 ( Jin-sa Kim )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 35권 2호 발행 연도 : 2022 페이지 : pp. 160-164 (5 pages)

다운로드

(기관인증 필요)

초록보기

In this paper, through the development of a smart panel (LCD kiosk) controller, contents to develop a system that can be operate in a desired environment by operating the window control and ventilation facilities according to the automatic controller operation based on the set values such as temperature, humidity, sunlight, and rainfall. In particular, the MQTT protocol-based sensor module can be directly manufactured and applied at any time based on various communication and power sources such as wireless, wired, and PLC (power line communication) to obtain the desired data, as well as fire, power failure, and intrusion in the house. It is also a system that enables operation and monitoring from a remote location based on the cloud environment by connecting sensors. Kiosks are currently being used in many places, and the demand for them is on the rise, and an active influx of young people can be expected through environmental improvement. It is expected to increase interest and understanding for improvement.

KCI등재

9NIR 협대역 투과 필터 응용을 위한 LED 실리콘 봉지재 위에 직접 E-beam으로 증착 된 SiO2/TiO2 다층 박막 설계 및 제작

저자 : 김동표 ( Dong Pyo Kim ) , 김경섭 ( Kyung-seob Kim ) , 김구철 ( Goo-cheol Kim ) , 정중채 ( Jung-chae Jeong )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 35권 2호 발행 연도 : 2022 페이지 : pp. 165-171 (7 pages)

다운로드

(기관인증 필요)

초록보기

The SiO2/TiO2 multilayer thin films used for narrow band pass filter were fabricated using E-beam evaporation method. The narrow band pass filter was used to enhance the resolution of spectroscopy and sensor applications with near infrared (NIR) light source. The narrow band pass filter with multilayer thin films were designed with Essential Macleod program. The multilayers of SiO2/TiO2 with 32 layers were deposited on the silicon encapsulation of IR with peak wavelength (λp) of 660 nm and NIR LEDs with λp of 830 nm, 880 nm, and 955 nm. After NIR light passed through the narrow band pass filter, the full width of half maximum of 33.4~48.6 nm became narrow to 20~24 nm owing to the absorption of photons with short or long wavelength of designed band of 20 nm. The SiO2/TiO2 band pass filter fabricated in this study can be used for sensor, optoelectronics, and NIR spectroscopy applications.

KCI등재

102세대 초전도 선 안정화 층 구조변화가 비저항 특성에 미치는 영향

저자 : 반상재 ( Sang-jae Ban ) , 두호익 ( Ho-ik Du ) , 정현기 ( Hyun-gi Jeong ) , 두승규 ( Seung-gyu Doo ) , 양성채 ( Sung-chae Yang )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 35권 2호 발행 연도 : 2022 페이지 : pp. 172-177 (6 pages)

다운로드

(기관인증 필요)

초록보기

The quench voltage of the second-generation superconducting wire is affected by the resistivity characteristics of the stabilization layer. The specific resistance of the stabilization layer can be changed by the deposition process using RF magnetron sputtering. In this paper, a thin film made of a homogeneous material (Ag) and a dissimilar material (Cu) was deposited on the stabilization layer of the second-generation superconducting wire through RF magnetron sputtering. We found that the specific resistance was reduced by increasing the thickness of the stabilization layer. The reduction in the resistivity of the stabilization layer led to a decrease in the quench voltage of the second-generation superconducting wire. We suggest that various characteristic changes of the second-generation superconducting wire can be expected through the successful change in the resistivity of the stabilization layer of the proposed deposition process.

12
권호별 보기
같은 권호 다른 논문
| | | | 다운로드

KCI등재

1국문논문지 개편과 관련하여

저자 : 조욱 ( Wook Jo )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권 5호 발행 연도 : 2021 페이지 : pp. 269-270 (2 pages)

다운로드

(기관인증 필요)

키워드 보기
초록보기

KCI등재

2자기-기계-전기 변환소자를 이용한 에너지 하베스팅 기술

저자 : 황건태 ( Geon-tae Hwang ) , 류정호 ( Jungho Ryu ) , 윤운하 ( Woon-ha Yoon )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권 5호 발행 연도 : 2021 페이지 : pp. 271-282 (12 pages)

다운로드

(기관인증 필요)

초록보기

The internet of things (IoT) technology is a key component for the advent of 4th industrial revolution, which is the network of home appliances, infrastructures, and vehicles to remotely investigate these systems. For the operation of compact IoT devices, batteries are widely used as electric power, and the limited lifetime of batteries inevitably leads to periodic replacement. Magneto-mechano-electric (MME) generators may be alternatives to batteries inside the IoT devices by converting stray magnetic field into electric energy, since we are always surrounded by ambient alternating current (AC) magnetic fields induced from electric power transmission lines everywhere. This article reviews the recent domestic research progress in high-performance MME generators and their application field for IoT and electronic devices.

KCI등재

3할라이드 페로브스카이트 단결정

저자 : 최진산 ( Jin San Choi ) , 조재훈 ( Jae Hun Jo ) , 우도현 ( Do Hyun Woo ) , 황영훈 ( Young-hun Hwang ) , 김일원 ( Ill Won Kim ) , 김태헌 ( Tae Heon Kim ) , 안창원 ( Chang Won Ahn )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권 5호 발행 연도 : 2021 페이지 : pp. 283-295 (13 pages)

다운로드

(기관인증 필요)

초록보기

For the last decades, a research hotspot for the halide perovskites (HPs) is now showing great progress in terms of improving efficiency for numerous photovoltaic devices (PVDs). However, it still faces challenges in the case of long-term stability in the air atmosphere. Defect-free high-quality HP single crystals show their promising properties for the remarkable development of highly efficient and stable PVDs. Here, we summarize the growth processing routes for the stable HP single crystals as well as briefly discuss the pros and cons of those well-established synthesis routes. Furthermore, we briefly include the comparison note between the HP single crystals and polycrystalline perovskite films regarding their device applications. Based on the future progress, the review concludes subjective perspectives and current challenges for the development of HPs high-quality PVDs.

KCI등재

4FinFET 및 GAAFET의 게이트 접촉면적에 의한 열저항 특성과 Fin-Layout 구조 최적화

저자 : 조재웅 ( Jaewoong Cho ) , 김태용 ( Taeyong Kim ) , 최지원 ( Jiwon Choi ) , 최자양 ( Ziyang Cui ) , 신동욱 ( Dongxu Xin ) , 이준신 ( Junsin Yi )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권 5호 발행 연도 : 2021 페이지 : pp. 296-300 (5 pages)

다운로드

(기관인증 필요)

초록보기

The performance of devices has been improved with fine processes from planar to three-dimensional transistors (e.g., FinFET, NWFET, and MBCFET). There are some problems such as a short channel effect or a self-heating effect occur due to the reduction of the gate-channel length by miniaturization. To solve these problems, we compare and analyze the electrical and thermal characteristics of FinFET and GAAFET devices that are currently used and expected to be further developed in the future. In addition, the optimal structure according to the Fin shape was investigated. GAAFET is a suitable device for use in a smaller scale process than the currently used, because it shows superior electrical and thermal resistance characteristics compared to FinFET. Since there are pros and cons in process difficulty and device characteristics depending on the channel formation structure of GAAFET, we expect a mass-production of fine processes over 5 nm through structural optimization is feasible.

KCI등재

5압전재료의 기초 물성 측정

저자 : 강우석 ( Woo-seok Kang ) , 이건주 ( Geon-ju Lee ) , 조욱 ( Wook Jo )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권 5호 발행 연도 : 2021 페이지 : pp. 301-313 (13 pages)

다운로드

(기관인증 필요)

초록보기

본 논문은 대학 연구실과 산업현장에서 강유전 압전 분야 연구를 갓 시작한 이들이 압전 소재의 특성에 대한 기초적, 이론적 개념에 대해서는 각종 교과서와 논문을 통해 쉽게 접할 수 있는 반면, 그 특성들이 실제로 어떻게 측정되고 평가되는 지에 대한 정보를 얻기가 힘들다는 점에 착안하여 압전 분야 입문자가 관련 측정 기술을 보다 쉽게 이해하고 접근할 수 있도록 돕는 것을 목적으로 한다. 기초 유전 물성인 임피던스에 기반한 유전상수와 유전손실 측정법을 시작으로 압전상수, 전기기계결합계수, 품질계수 및 측정 방법에 대해 논의하고, 강유전성을 대표하는 전계에 따른 분극 변화 측정법에 대해 기술하였다. 본 논문에서는 이미 표준화되어 있는 측정법들을 소개하고 있지만, 이를 숙지하고 응용한다면 보다 도전적이고 창의적인 측정법을 도출할 수 있을 것으로 기대한다.

KCI등재

6에어로졸 증착한 세라믹/금속 복합막의 금속 함량에 따른 습도 감지 특성 연구

저자 : 김익수 ( Ik-soo Kim ) , 구상모 ( Sang-mo Koo ) , 박철환 ( Chulhwan Park ) , 신원호 ( Weon Ho Shin ) , 이동원 ( Dong-won Lee ) , 오종민 ( Jong-min Oh )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권 5호 발행 연도 : 2021 페이지 : pp. 314-320 (7 pages)

다운로드

(기관인증 필요)

초록보기

Controlling ambient humid condition through high performance humidity sensors has become important for various fields, including industrial process, food storage, and the preservation of historic remains. Although aerosol deposited humidity sensors using ceramic BaTiO3 (BT) material have been widely studied because of their longtime stability, there remain critical disadvantages, such as low sensitivity, low linearity, and slow response/recovery time in case of the sensors fabricated at room temperature. To achieve superior humidity sensing properties even at room temperature condition, BT-Cu composite films utilizing aerosol deposition (AD) process have been proposed based on the percolation theory. The BT-Cu composite films showed gradually improved sensing properties until the Cu concentration reached 15 wt% in the composite film. However, the excessive Cu (above 30 wt%) containing BT-Cu composite films showed a rapid decrease of the sensing properties. The results of observed surface morphology of the AD fabricated composite films, to figure out the metal filler effect, showed correlation between surface topography as well as size and the amount of open pores according to the metal filler content. Overall, it is very important not only dielectric constant of the humidity sensing films but also microstructures, because they affect either the variation range of capacitance by ambient humidity or adsorption/desorption of ambient humidity onto/from the humidity sensing films.

KCI등재

7브러쉬 코팅 공정을 이용한 용액 기반 BiAlO 박막의 제작과 액정 소자에의 응용

저자 : 이주환 ( Ju Hwan Lee ) , 김대현 ( Dai-hyun Kim )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권 5호 발행 연도 : 2021 페이지 : pp. 321-326 (6 pages)

다운로드

(기관인증 필요)

초록보기

We fabricated BiAlO thin film by a solution process with a brush coating to be used as liquid crystal (LC) alignment layer. Solution-processed BiAlO was coated on the glass substrate by brush process. Prepared thin films were annealed at different temperatures of 80℃, 180℃, and 280℃. To verify whether the BiAlO film was formed properly, X-ray photoelectron spectroscopy analysis was performed on Bi and Al. Using a crystal rotation method by polarized optical microscopy, LC alignment state was evaluated. At the annealing temperature of 280℃, the uniform homogenous LC alignment was achieved. To reveal the mechanism of LC alignment by brush coating, field emission scanning electron microscope was used. Through this analysis, spin-coated and brush coated film surface were compared. It was revealed that physical anisotropy was induced by brush coating at a high annealing temperature. Particles were aligned in one direction along which brush coating was made, resulting in a physical anisotropy that affects a uniform LC alignment. Therefore, it was confirmed that brush coating combined with BiAlO thin film annealed at high temperature has a significant potential for LC alignment.

KCI등재

8리튬이온 배터리의 분리막 손상 요인별 방전펄스의 검출과 분석

저자 : 임승현 ( Seung-hyun Lim ) , 이경렬 ( Gyeong-yeol Lee ) , 김남훈 ( Nam-hoon Kim ) , 김동언 ( Dong-eon Kim ) , 길경석 ( Gyung-suk Kil )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권 5호 발행 연도 : 2021 페이지 : pp. 327-332 (6 pages)

다운로드

(기관인증 필요)

초록보기

Lithium-ion batteries (LIBs) have become a main energy storage device in various applications, such as portable appliances, renewable energy facilities, and electric vehicles. However, the poor thermal stability of LIBs may cause explosion or fire. The thermal runaway is the result of a failure of the separator inside LIB. Damages like tearing, piercing, and collapsing of the separator were simulated in a mechanical, an electrical, and a thermal way, and small discharge pulses of a few mV were detected at the time of separator damages. From the experimental results, this paper provided a method that can identify the separator failure before thermal runaway in the aspect of a potential explosion and fire prevention measures.

KCI등재

9벌크형 고온 초전도 합성

저자 : 이상헌 ( Sang Heon Lee )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권 5호 발행 연도 : 2021 페이지 : pp. 333-336 (4 pages)

다운로드

(기관인증 필요)

초록보기

Oxide YBCO bulk superconductors are manufactured using the melt process. Because seed crystal growth method utilizes a slow-spreading layer-by-layer reaction, a long-term heat treatment is required to manufacture a single-crystal specimen of several cm. In this study, the melt process method was applied to compensate for the shortcomings of the seed crystal growth method. The thickness of the upper and lower pellets of the YBCO bulk was molded to 40 mm, and YBCO superconductor was produced by heat treatment. The measurement results of capture magnetism was in line with the literature. This results in a relationship that the higher the growth of Y211 particle in the YBCO, the higher the superconducting properties. We analyzed the YBCO superconductor, focusing on the Y2BaCuO5 particle distribution.

KCI등재

10Phase Evolution, Thermal Expansion, and Microwave Dielectric Properties of Cordierite-Al2O3 Composite

저자 : Shin Kim , Eun-doe Song , Hae-jin Hwang , Joo-sung Lee , Sang-ok Yoon

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권 5호 발행 연도 : 2021 페이지 : pp. 337-341 (5 pages)

다운로드

(기관인증 필요)

초록보기

Phase evolution, thermal and microwave dielectric properties of cordierite-Al2O3 composite were investigated. As the content of Al2O3 increased, mullite, sapphirine, and spinel were formed as secondary phases, implying that cordierite may be decomposed by the reaction with Al2O3. All sintered specimens exhibited dense microstructures. The densification occurred through liquid phase sintering. As the content of Al2O3 increased, the thermal expansion coefficient and the dielectric constant increased, whereas the quality factor decreased. The thermal expansion coefficient, the dielectric constant, and the quality factor of the 90 wt% cordierite 10 wt% Al2O3 composite sintered at 1,425℃ were 2.9×10-6 K-1, 5.1, and 34,844 GHz, respectively.

12
발행기관 최신논문
자료제공: 네이버학술정보
발행기관 최신논문
자료제공: 네이버학술정보

내가 찾은 최근 검색어

최근 열람 자료

맞춤 논문

보관함

내 보관함
공유한 보관함

1:1문의

닫기