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레이저를 이용한 결정질 실리콘 태양전지의 Double Texturing 제조 및 특성
권준영,한규민,최성진,송희은,유진수,유권종,김남수,Kwon, Jun-Young,Han, Kyu-Min,Choi, Sung-Jin,Song, Hee-Eun,Yoo, Jin-Soo,Yoo, Kwon-Jong,Kim, Nam-Soo 한국재료학회 2010 한국재료학회지 Vol.20 No.12
In this paper, double texturization of multi crystalline silicon solar cells was studied with laser and reactive ion etching (RIE). In the case of multi crystalline silicon wafers, chemical etching has problems in producing a uniform surface texture. Thus various etching methods such as laser and dry texturization have been studied for multi crystalline silicon wafers. In this study, laser texturization with an Nd:$YVO_4$ green laser was performed first to get the proper hole spacing and $300{\mu}m$ was found to be the most proper value. Laser texturization on crystalline silicon wafers was followed by damage removal in acid solution and RIE to achieve double texturization. This study showed that double texturization on multi crystalline silicon wafers with laser firing and RIE resulted in lower reflectance, higher quantum yield and better efficiency than that process without RIE. However, RIE formed sharp structures on the silicon wafer surfaces, which resulted in 0.8% decrease of fill factor at solar cell characterization. While chemical etching makes it difficult to obtain a uniform surface texture for multi crystalline silicon solar cells, the process of double texturization with laser and RIE yields a uniform surface structure, diminished reflectance, and improved efficiency. This finding lays the foundation for the study of low-cost, high efficiency multi crystalline silicon solar cells.
Fe-based multifunctional nanoparticles with various physicochemical properties
권준영,Xiang Mao,이재범 한국물리학회 2017 Current Applied Physics Vol.17 No.8
Over the past few decades, many studies have assessed Fe-based nanoparticles because of their high earth abundance, inexpensive precursors, unique optical properties, electromagnetic nature, biocompatibility, and interactivity with cells. By controlling the composition of a composite, the morphology, size, physical properties, and related functionalities, the synthesized nanomaterials can be altered for specific applications. This review introduces several methods for synthesizing iron-based binary/ternary chalcogenides, iron-based bimetallic materials, and iron-based magnetoplasmonic materials with a range of properties. Furthermore, assembled nanostructures make it possible for us to use these building blocks for broader and customized applications depending on their controlled arrangement. This will facilitate the potential application of iron-based functional materials in spintronics, biomedicine, electronics, and catalysis.
Synthesis and Analysis of Amide-based High Heat-resistant Polyimides
권준영,이승우 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
With the development of advanced technology, it was intended to make high-strength heat-resistant polyimide for future military power. In this study, an effort was made to make polyimide that satisfies a 95% decomposition temperature of 400 ℃ or higher and a tensile strength of 80 Mpa or higher. The structures of the resulting compounds and polyimides were analyzed by ¹H-NMR (proton nuclear magnetic resonance spectroscopy), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA) and UTM. Amide-type AA1 and AA2 showed thermal stability of 410~421 °C under the influence of the cyclohexyl group contained in the monomer, and sufficiently achieved over 400 ℃ when the Td was 95%. Although the mechanical properties of the amide system showed some differences depending on the type of dianhydride used together with diamine, the tensile strength was 86~87 Mpa, and the target 80 Mpa or higher was easily achieved. All of the goals set were achieved.
권준영,김주영 한국통합생물학회 2013 Animal cells and systems Vol.17 No.2
Oviparous fishes are known to possess two types of aromatase, which are ovary type (cyp19a1a) and brain type (cyp19a1b). These aromatases play important roles in the reproduction of oviparous fish. However, little information is available on the role of aromatases in the reproduction of viviparous fish. This study has been carried out to examine the changes of aromatase gene expression prior to and during vitellogenesis and during gestation in a marine viviparous fish, black rockfish, Sebastes schlegelii. The coding sequence of cyp19a1b gene cloned from rockfish brain was 1497 nucleotides (nt). Rockfish cyp19a1b was more similar to cyp19a1b from other fish species than to rockfish cyp19a1a in amino acid sequence. In addition, phylogenetic analysis showed that aromatases of this viviparous rockfish were more similar to those of oviparous fishes than those of viviparous mammals. Cyp19a1a mRNA was expressed most strongly in the ovary and weakly in the testis, brain, and spleen. Cyp19a1b mRNA was detected only in the brain at cortical alveolus stage (CA) but, additionally, detected in the ovary during vitellogenesis and gestation. The expression of both aromatase mRNAs was the highest at the vitellogenic stage (V) and the expression of cyp19a1a mRNA far exceeded that of cyp19a1b mRNA in the ovary of all reproductive stages studied here. Results from this study suggests that viviparous rockfish also has two distinct aromatase genes as oviparous fish do, and that the expression of cyp19a1a, rather than cyp19a1b, in the ovary is closely related to the vitellogenic activity in this species.
Synthesis and Analysis of Polyimide with Increased Physical Properties Using APTMS and TEOS
권준영,이승우,이유정 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
Most of aromatic polyimide has excellent physical properties, but it has a dark brown color making it difficult to apply to a display field requiring colorless and transparent optical properties. In this study, a transparent polyimide with good physical properties was prepared by the thermal imidization to solve this problem. To improve the physical properties, it was added TEOS or APTMS to 4,4'-(Hexafluoroisopropylidene) diphthalic anhydride (6FDA) and TFMB to create a crosslinked structure using a sol-gel process. The structure of the resulting polyimide was analyzed by fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA) and UTM. It was found that the tensile strength of the polyimide polymer made by adding water to 6FDA, TFMB, and APTMS increased as the content of water increased, that is, as the APTMS content decreased and the TEOS content decreased.
조피볼락, Sebastes sclegeli의 성분화 기간 중 cytochrome P450 aromatase 유전자의 발현
권준영,이찬희 한국발생생물학회 2007 발생과 생식 Vol.11 No.3
자웅이체형 어류의 성결정 및 성분화는 일반적으로 각 개체의 유전형을 따른다. 자연환경에서는 자신이 가진 유전정보의 조절에 따라 성분화 시기에 아로마테이즈 유전자의 발현이 증가하거나 감소하고 그 결과 스테로이드 호르몬들의 조성이 결정되어 각기 다른 방향으로 성분화하는 것으로 알려져 있다. 본 연구에서는 해산 태생어류인 조피볼락(Sebasts schlegeli)의 ovarian type aromatase (P450aromA)와 brain type aromatase (P450aromB)의 유전자를 부분적으로 클로닝하여, 이들의 염기서열을 밝혔으며, 각 유전자에 대한 primer를 제작한 후 성분화 기간 중 이 유전자들의 발현을 조사하였다. 조피볼락 아로마테이즈 유전자들은 조사를 시작한 출산 후 35일째에 여러 개체의 머리와 몸에서 각각 발현되었으나, 52일째에는 아로마테이즈 유전자들의 발현 개체수가 현저히 감소하였다. 그리고 출산 59일째에는 발현개체 수가 다시 증가하였다. P450aromA과 P450aromB의 발현 양상은 전반적으로 유사하였으나, 45일째에는 P450aromB의 발현 개체 수가 P450aromA 발현 개체 수 보다 훨씬 많았다. 조직학적 분석을 통해 제시된 이 종의 성분화 시기는 지금까지 출산 50-65일 전후로 알려져 왔으나, 본 연구에서 나타난 아로마테이즈 유전자들의 발현 결과를 볼 때, 이 종의 실질적인 성분화는 알려진 것보다 최소한 1-2주 정도 빨리 진행될 가능성이 있다. 본 연구의 결과는 또한 태생어류의 성분화도 난생어류의 성분화에서 보고된 것과 마찬가지로 아로마테이즈의 작용과 밀접하게 연관되어 있다는 사실을 시사한다.