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박형식(Hyeongsik Park),정재성(Jaesung Jung),신명훈(Myunghun Shin),김선보(Sunbo Kim),이준신(Junsin Yi) 한국태양광발전학회 2016 Current Photovoltaic Research Vol.4 No.3
We discussed various cover glass substrates available for photovoltaic (PV) modules, and investigated the fabrication methods of light trapping structures for the efficiency enhancement of PV modules: wet and dry etching or laser and direct patternings. We also introduced the analysis of haze at etched glass surfaces as a function of wavelength and also presented a anti-reflection coating technology for PV module.
실리콘 이종접합 태양광 모듈의 신뢰성 향상에 관한 연구
박형식(Hyeongsik Park),신은구(Eungu Shin),이현석(Hyeonseok Lee),정재성(Jae-Seong Jeong) 한국신뢰성학회 2018 한국신뢰성학회 학술대회논문집 Vol.2018 No.5
건물일체형 태양광 모듈 (Building-integrated photovoltaics, BIPV)은 태양광에너지로 전기를 생산하여 모듈이 설치된 건물에 전기를 공급하는데 태양광 모듈은 고성능의 수명, 고출력과 더불어 저가로 제작되어야 한다. 그래서 이번 연구에서는 저가, 고성능 및 고 신뢰성의 태양광 모듈을 제작하고자 고효율의 태양전지인 실리콘 이종접합 태양전지(Silicon heterojunction solar cell), 모듈봉지 재료인 PVB를 선택하여 제작했고, 성능을 확인하기 위해 85℃/85%RH 조건에서 1000시간 동안 선행 시험을 진행하였다. 시험 진행 결과 300시간 까지 진행된 시험에서 Normalized current 값이 급격하게 감소한 결과를 얻었고 이는 출력값 저하로 이어졌는데, 습기 침투가 원인임을 확인하였다. 그래서 습기 침투와 관련된 문제점을 보완하고자 봉지재 및 모듈 제작 공정 최적화와 수치해석 분석을 통해 태양광 모듈의 신뢰성 향상에 대해 논의하고자 한다.
박형식(Hyeongsik Park),신명훈(Myunghoon Shin),안시현(Shihyun Ahn),김선보(Sunbo Kim),봉성재(Sungjae Bong),Anh Le Tuan,S. Q. Hussain,이준신(Junsin Yi) 한국태양광발전학회 2014 Current Photovoltaic Research Vol.2 No.3
Light trapping techniques can change the propagation direction of incident light and keep the light longer in the absorption layers of solar cells to enhance the power conversion efficiency. In thin film silicon (Si) solar cells, the thickness of absorption layer is generally not enough to absorb entire available photons because of short carrier life time, and light induced degradation effect, which can be compensated by the light trapping techniques. These techniques have been adopted as textured transparent conduction oxide (TCO) layers randomly or periodically textured, intermediate reflection layers of tandem and triple junction, and glass substrates etched by various patterning methods. We reviewed the light trapping techniques for thin film Si solar cells and mainly focused on the commercially available techniques applicable to textured TCO on patterned glass substrates. We described the characterization methods representing the light trapping effects, texturing of TCO and showed the results of multi-scale textured TCO on etched glass substrates. These methods can be used tandem and triple thin film Si solar cells to enhance photo-current and power conversion efficiency of long term stability.
[Invited Review] 고효율 태양전지 적용을 위한 저온 투명전극 소재 연구현황 리뷰
박형식(Hyeongsik Park),김영국(Youngkuk Kim),오동현(Donghyun Oh),팜 뒤퐁(Duy Phong Pham),송재천(Jaechun Song),이준신(Junsin Yi) 한국신재생에너지학회 2021 신재생에너지 Vol.17 No.1
Transparent conducting oxide (TCO) films have been widely used in optoelectronic devices, such as OLEDs, TFTs, and solar cells. However, thin films of indium tin oxide (ITO) have few disadvantages pertaining to process parameters such as substrate temperature and sputtering power. In this study, we investigated the requirements for using TCO films in silicon-based solar cells and the best alternative TCO materials to improve their efficiency. Moreover, we discussed the current status of high-efficiency solar cells using low-temperature TCO films such as indium zinc oxide and Zr-doped indium oxide.
장주연(Jang, Juyeon),박형식(Park, Hyeongsik),안시현(Ahn, Sihyun),조재현(Jo, Jaehyun),장경수(Jang, Kyungsoo),이준신(Yi, Junsin) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
Cost efficient and large area deposition of superior quality Al₂O₃ doped zinc oxide (AZO) films is instrumental in many of its applications including solar cell fabrication due to its numerous advantages over ITO films. In this study, AZO films were prepared by a highly efficient rotating cylindrical dc magnetron sputtering system using AZO target, which has a target material utilization above 80%, on glass substrates in argon ambient. A detailed analysis on the electrical, optical and structural characteristics of AZO thin films was carried out for solar cell application. The properties of films were found to critically depend on deposition parameters such as sputtering power, substrate temperature, working pressure, and thickness of the films. A low resistivity of {sim}5.5{times}10-4{Omega}-cm was obtained for films deposited at 2kW, keeping the pressure and substrate temperature constant at 3 mtorr and 230?C respectively, mainly due to an increase in carrier mobility and large grain size which would reduce the grain boundary scattering. The increase in carrier mobility with power can be attributed to the columnar growth of AZO film with (002) preferred orientation as revealed by XRD analysis. The AZO films showed a high transparency of>87% in the visible wavelength region irrespective of deposition conditions. Our results offers a cost-efficient AZO film deposition method which can fabricate films with significant low resistivity and high transmittance that can find application in thin-film solar cells.