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단결정 실리콘 태양전지의 반사방지막에 적용하기 위한 다공성 실리콘에 대한 연구
김범호(Bum-ho Kim),최준영(Jun-young Choi),이은주(Eun-joo Lee),이수홍(Soo-hong Lee) 한국태양에너지학회 2007 한국태양에너지학회 학술대회논문집 Vol.- No.-
Silicon solar cell has optical losses, which can be reduced using texture structure and anti-reflection coatings. In general, texture structure is made by chemical etching or lithography process. But these are unsuitable for multi-crystalline silicon substrates because multi-crystalline silicon has not uniform orientation. Anti-reflection coating is made by vacuum equipments such as CVD, but the vacuum processing is very complicated and costly. It is well known that porous silicon acting as an anti-reflection coating reduces optical losses. Playing several roles like selective emitter and passivation as well as Anti-reflection coating in solar cells, porous silicon can be improved cell efficiency effectively. Porous silicon is formed by anodization and can be obtained in an electrolyte with hydrofluoric acid (HF-C₂H₅OH-H₂O) by two methods : electrochemical etching and chemical etching. In this paper, we produced porous silicon by electrochemical method.
Raman 측정에 의한 육방정계 Si 단결정의 상 변화 특성 해석
김경화,이강석,안형수,이재학,전영태,양민,이삼녕,황선령,이상걸,노효진,이원재,하동한,김석환 한국물리학회 2021 새물리 Vol.71 No.10
The Raman properties of a hexagonal Si single-crystal structure were investigated. For a sample with a total length of 3230 m, 46 positions were selected, and the incident laser power was changed from 0.5 mW to 50 mW in 9 steps. Starting from the root, which is the growth engine, the phase changes in the body and in the tip of the hexagon were analyzed using Raman peaks. The Si-IV polymorph ! Si-XII ! Si-XIII through a series of processes is converted to the Si-IV phase, and the possibility of its being changed back to the semimetal semiconductor Si-IV ! Si-III is explained. In addition, it was confirmed that this phase change was confirmed to result in a very stable hexagonal Si single crystal that did not change over 10000 hours. The results are expected in the future to serve as a starting point for various applications in the field of Si research. 육방정계 Si 단결정 구조에 대한 라만 특성을 조사하였다. 총 길이 3230 m의 시료에 대해 46개의위치를 선택하였으며, 입사 레이저 파워는 0.5 mW에서 50 mW 까지 9 등급으로 변화하였다. 성장동력이 되는 뿌리 부분에서 시작하여 육방정계의 몸체 그리고 끝부분의 상 변화를 라만 피크를 이용하여해석하였다. Si-IV 다형체 ! Si-XII ! Si-XIII의 일련의 과정을 거쳐 Si-IV의 상으로 전환되고, 다시Si-IV ! Si-III 의 반금속 반도체로 변화되는 가능성을 설명한다. 또한 성장된 결정은 10000시간이상에서도 변화가 없는 매우 안정적인 육방정계 Si 단결정임을 확인하였다. 이 결과는 앞으로 Si 분야의다양한 응용을 위한 출발점이 될 수 있을 것으로 기대한다.
이상주(Sang-Joo Lee),한승우(Seung-Woo Han),김재현(Jae-Hyun Kim),이학주(Hak-Joo Lee) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
The mechanical behavior of small-sized materials has been investigated for many industrial applications, including MEMS and semiconductors. It is challenging to obtain accurate mechanical properties measurements for thin films due to several technical difficulties, including measurement of strain, specimen alig㎚ent, and fabrication. In this work, we used the micro-tensile testing unit with the real-time DIC (Digital Image Correlation) strain measurement system. This system has advantages of real time strain monitoring up to 50 ㎚ resolution during the micro-tensile test, and ability to measure the young’s modulus and Poisson’s ratio at the same time. The mechanical properties of SCS (Single Crystal Silicon) are measured by uniaxial tension test from freestanding SCS which are 2.5 ㎛ thick, 200-500 ㎛ wide specimens on the (100) plane. Young’s modulus, Poisson’s ratio and tensile strength in the 〈110〉 direction are measured by micro-tensile testing system.
기계적 하중 하에서 복합재료 시험편에 접착된 단결정 실리콘태양전지의 성능평가
김종천 ( Jong Cheon Kim ),최익현 ( Ik Heon Choi ),김대현 ( Dae Hyun ),정성균 ( Kim Seong Hyu Cheong ) 한국복합재료학회 2011 Composites research Vol.24 No.6
본 연구에서는 화석에너지 고갈과 환경문제로 인해 새로운 신재생에너지로 주목 받고 있는 태양전지를 대표적인 경량재료인 복합재료에 적용하기 위해 적절한 태양전지 접착 방법에 대한 연구를 진행하였다. 사용된 태양전지는 후면전극 태양전지로 에너지변환 실험실 효율이 약 24.2%인 태양전지를 사용하였다. 하지만, 실리콘계열 태양전지는 재료의 특성상 깨지기 쉽기 때문에 일반적으로 사용되고 있는 동시경화 접착법 대신 접착제를 이용한 이차 접착법을 사용하였다. 접착재료는 태양전지의 충진재 및 접착제로 사용되고 있는 EVA film 과 프리프레그의 수지인 Resin film, 그리고 탄성 접착제를 이용하여 실험을 진행 하였으며, 태양전지가 접착된 복합재료 시험편에 기계적 하중을 부가하여 접착제 종류별 태양전지의 성능변화를 측정하였다. 또한, 기계적 하중 하에서 실시간으로 태양전지의 성능을 평가할 수 있는 측정장치를 설계하여 접착재료별 파단 시점과 특성을 비교?평가 하였다. 파단면분석을 통해 태양전지 효율 감소원인을 분석하여 고찰하였다. 실험결과 태양전지의 접착방법에 따라서 태양전지의 효율이 크게 영향을 받는다는 것을 파악하였다. 또한, 탄성접착제를 사용한 접착 방법이 가장 높은 태양전지 효율 성능을 보여주고 있음을 확인하였다. The objective of this study is to investigate appropriate bonding methods of solar cells in order to apply solar cells, which have been receiving particular attention as a renewable energy due to fossil energy depletion and environment issues, to composite structures. Back-contact solar cells with approximately 24.2% energy conversion efficiency were used in this study. Since silicon-based solar cells are mechanically fragile, the secondary-bonding methods using adhesive were examined in this study. The experiment was conducted with three kinds of bonding materials such as EVA film, Resin film and elastic adhesive. The performance of solar cells for three types of adhesives under mechanical Loading on test specimens is conducted. In addition, the measuring equipment was designed to evaluate the performance of the solar cells under mechanical Loading in real time and the fracture characteristics depending on bonding materials were evaluated. The reason decreasing solar cells efficiency were analyzed and considered by Fractography. The results show that the solar cell performance is largely affected by bonding techniques. Moreover, the bonding method using elastic adhesive shows best solar cell efficiency.
이재준,김대은,Lee, Jae-Joon,Kim, Dae-Eun 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.10
The objective of this study is to develop novel method named mechanical and chemical machining technique, which is capable of producing three dimensional patterns of few micrometers in dimension on a silicon wafer without the use of a mask. The strategy is to impart mechanical energy along the path of the pattern to be fabricated on a single crystal silicon by way on introdusing frictional interaction under controlled conditions. Then, the surface is preferentially etched to reveal the areas that have been mechanically energized. Upon completion of the etching process, the three dimensional pattern is produced on the silicon surface. Experiments have been conducted to identify the optimal tool material, geometery, as well as fabrication condition. The new technique introduced in this paper is significantly simpler than the conventional method which require sophisticated equipment and much time.
류지호 ( Ji-ho Ryu ) 한국고등직업교육학회 2001 한국고등직업교육학회논문집 Vol.2 No.3
It has been reported that a lot of defects existed in the zone-melting recrystallized silicon thin film. These defects restricted the industrial application of ZMR method. In this study, the defect microstructure of the recrystallized Si film was examined by optical microscope, SEM, thin film XRD and plan-view TEM. It was observed that the continuous subgrain boundaries were parallel to the (100) plane and the isolated dislocation and the dislocation cluster were located in the {111} plane of the 54.44° angle to the film thickness.
박성준,김용득,강정호,박세광 경북대학교 센서기술연구소 1995 센서技術學術大會論文集 Vol.6 No.1
Using piezoresistive effects of single-crystal and poly-crystalline silicon, pressure sensors of the same pattern were fabricated for comparison of temperature characteristics. Optimum size and aspect ratio of rectangular sensor diaphragm were calculated by FEM. For polysilicon pressure sensor, polysilicon resistors of Wheatstone bridge were deposited by LPCVD to be used in a wide temperature range. Polysilicon pressure sensors showed more stable temperature characteristics than single-crystal silicon in the range of -20~125[℃]. To get low TCO(Temperature Coefficient of Offset), below ±3[μV/V/℃], it is needed for each TCR of piezoresistors to have a deviation within ±25[ppm/℃]. TCR less than ± 500[ppm/℃] of resistors for polysilicon pressure sensor can result in low TCS(Temperature Coefficient of Sensitivity) of -0.1[%FS/℃].