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OHP 필름위에 증착된 AZO 반도체 박막의 광학 및 전기적인 특성 분석
김경보,이종필,김무진,Kim, Kyoung-Bo,Lee, Jongpil,Kim, Moojin 중소기업융합학회 2020 융합정보논문지 Vol.10 No.9
본 논문에서는 투과도가 높은 OHP 필름상에 AZO 반도체 물질을 기반으로 한 광센서를 제작하여 광소자 특성 및 이를 구성하고 있는 반도체 소재의 물성에 대해 설명한다. 최근 전자소자 분야에서 주요 이슈가 되고 있는 플렉서블 광소자를 구현하기 위해서 최초로 투명하고 굽힘성이 있는 OHP 필름을 기판으로 사용하였다. 또한, 투명 전극 및 반도체 물질로 양산에 사용되고 있는 ITO는 인듐의 희소성 때문에 가격이 높다. 따라서 이 물질을 대체할 수 있는 소재를 발굴해야 하며, AZO 소재가 가능성이 있는지 Au/Al/AZO/OHP 필름 구조의 광센서 소자를 구현하여 광학 및 전기적인 특성을 평가하였다. 소자 및 이를 구성하는 소재들은 벤딩(굽힘)에 의한 물성 변화가 없었으며, 이와 같은 결과들은 차세대 소자로의 적용에 대한 가능성을 제공한다. 하지만, 양산을 위해서는 OHP 필름 표면의 미세한 스크래치를 제거해야 하며, 뿐만 아니라 광전류를 향상시킬 수 있는 재료, 구조 기반으로 최적화된 소자를 연구해야 할 것이다. In this paper, an optical sensor based on an AZO semiconductor material is fabricated on an OHP film with high transmittance, and the characteristics of the optical element and the properties of the semiconductor material are described. In order to realize a flexible optical device, which is a major issue in the field of near-electronic devices, a transparent and bendable OHP film was used as a substrate. In addition, ITO, which is used for mass production as a transparent electrode and a semiconductor material, is expensive due to the scarcity of indium. Therefore, it is necessary to find a material that can replace it. The optical and electrical properties of the Au/Al/AZO/OHP structure are implemented to evaluate whether AZO is possible. It was found that devices and materials had no characteristic change by bending, and these results provide a possibility for application to a next-generation device. However, it is necessary to remove fine scratches on the surface of the OHP film, as well as optimized devices based on materials and structures that can improve the photocurrent.
제주지역 풍력발전량 실시간 감시 시스템 구축에 관한 연구
김경보(Kim Kyoung-Bo),양경부(Yang Kyung-Bu),박윤호(Park Yun-Ho),문창은(Mun Chang-eun),박정근(Park Jeong-Keun),허종철(Huh Jong-Chul) 한국태양에너지학회 2010 한국태양에너지학회 논문집 Vol.30 No.3
A real-time monitoring system was developed for transfer, receive, backup and analysis of wind power data at three wind farm(Hang won, Hankyung and Sung san) in Jeju. For this monitoring system a communication system analysis, a collection of data and transmission module development, data base construction and data analysis and management module was developed, respectively. These modules deal with mechanical, electrical and environmental problem. Especially, time series graphic is supported by the data analysis and management module automatically. The time series graphic make easier to raw data analysis. Also, the real-time monitoring system is connected with wind power forecasting system through internet web for data transfer to wind power forecasting system's data base.
제주지역의 낙뢰 발생 특성 및 풍력발전기의 피해사례 분석
김경보(Kim Kyoung-Bo),고경남(Ko Kyung-Nam),허종철(Huh Jong-Chul) 한국태양에너지학회 2007 한국태양에너지학회 학술대회논문집 Vol.- No.-
This paper presents the characteristics of lightning around Jeju island and the damage case in Hangwon wind farm. The data of lightning obtained by IMPACT, which is the sensor to detect the lightning, was analyzed in detail. The measurement period was for 3 years from 2004 to 2006. The results show that lightning occurs more frequently in hours of 11 ~ 13, and most frequently in summer. As for the lightning strength, the lightning of the grade -5 to -7 occurred most frequently. The lightning with high grade mainly occurred the northeastern coast, the western coast, the south coast and the western mountain region. Also, the wind turbine stop due to the lightning was analyzed according to the time series and the lightning strength in this paper.
기상청 MOS 예측값 적용을 통한 풍력 발전량 예측 타당성 연구
김경보(Kim Kyoung-Bo),박윤호(Park Yun-Ho),박정근(Park Jeong-Keun),고경남(Ko Kyung-Nam),허종철(Huh Jong-Chul) 한국태양에너지학회 2010 한국태양에너지학회 논문집 Vol.30 No.2
In this paper the feasibility of wind power forecasting from MOS (Model Output Statistics) was evaluated at Gosan area in Jeju during February to October in 2008. The observed wind data from wind turbine was compared with 24 hours and 48 hours forecasting wind data from MOS predicting. Coefficient of determination of measured wind speed from wind turbine and 24 hours forecasting from MOS was around 0.53 and 48 hours was around 0.30. These determination factors were increased to 0.65 from 0.53 and 0.35 from 0.30, respectively, when it comes to the prevailing wind direction(300°~60°). Wind power forecasting ratio in 24 hours of MOS showed a value of 0.81 within 70% confidence interval and it also showed 0.65 in 80% confidence interval. It is suggested that the additional study of weather conditions be carried out when large error happened in MOS forecasting.
광전자 소자 및 이차전지 소재로 페로브스카이트 반도체 막을 적용하기 위하여 질소 상압플라즈마 기술을 적용한 표면 처리 연구
김경보(Kyoung-Bo Kim),이종필(Jongpil Lee),김무진(Moojin Kim) 한국조명·전기설비학회 2021 조명·전기설비학회논문지 Vol.35 No.10
Perovskite materials have recently been intensively studied because of their excellent optical properties. However, when this material is exposed to air, there is a problem in that properties deteriorate. In this paper, we investigated whether such deterioration can be restored to its original characteristics by using nitrogen atmospheric pressure plasma technology. In order to observe the return to the original coated film, the experiment was conducted as follows. After coating the perovskite semiconductor material, when exposed to air for about 6 months, some grains are lifted due to contact with oxygen or water vapor, and holes are also observed. In order to restore these grain changes to the originally formed film, the surface of the semiconductor material was treated from 5 s to 1200 s using nitrogen plasma. The surface-treated samples were observed by SEM, EDS, and AFM analysis techniques. As a result of observing the surface shape using SEM, the flotation or hole disappeared for 5 seconds and 10 seconds, and the same surface shape as the deposited film was shown. However, in the film treated for 30 to 60 seconds, the thin film is gradually removed by nitrogen plasma. Under the condition of 180 seconds or more, a number of islands are very densely distributed rather than the form of a film. According to the AFM analysis, the surface roughness of the sample exposed to air for 180 days was about 14.724nm, but it can be seen that the roughness value was significantly reduced to 1.6338nm for the film that was processed for 5 seconds. A solar cell device was fabricated using the film exposed to air for 6 months and the surface-treated film. Nitrogen plasma treatment confirmed the improvement of degraded thin film properties. These results suggest the possibility of restoration even if the perovskite thin film degrades due to exposure to the air in the future.