• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2010.06a
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• pp.235-235
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• 2010

The Anti-reflection coating(ARC) properties can be formed on silicon substrate using a simple electrochemical etching technique. This etching step can be improve solar cell efficiency for a solar cell manufacturing process. This paper is based on the removal of silicon atoms from the surface a layer of porous silicon(PSi). Porous silicon is form by anodization and can be obtained in an electrolyte with hydrofluoric. It have demonstrated the feasibility of a very efficient porous Si layer, prepared by a simple, cost effective, electrochemical etching method. We expect our research can results approaching to lower than 10% of reflectance by optimization of process parametaer.

• Proceedings of the Korean Vacuum Society Conference
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• 2014.02a
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• pp.349-349
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• 2014

ITO는 결정질 실리콘 태양전지의 anti-reflection coating (ARC) 층으로써 적합한 물질이다. ARC layer로써 구조적, 전기적 그리고 광학적 최적 조건의 특성을 얻기 위해는 높은 figure of merit(FOM)를 가져야 하고 결정방향 제어를 해야 한다. 본 연구에서는 결정질 실리콘 태양전지에 가장 적합한 ITO ARC layer의 특성 찾기 위해 Radio frequency magnetron sputter를 이용하여 공정 조건가변 실험을 진행 하였으며 높은 FOM을 갖는 ITO 반사방지막을 shallow emitter형 결정질 실리콘 태양전지에 적용하였으며 ITO 박막은 shallow emitter층과 완벽한 ohmic 접합을 이루었다. ITO ARC layer를 적용한 Shallow emitter형 태양전지는 81.59%의 fill factor와 $35.52mA/cm^2$의 단락전류를 보이며 17.27%의 광변환 효율을 보였다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2006.06a
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• pp.152-153
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• 2006

본 연구에서는 태양전지 표면에 입사된 광자의 반사손실을 최소화하기 위한 방법으로써 기판 표면에 다공성 실리콘층을 이용한 반사방지막 (Anti-Reflection Coating, ARC)을 형성하는 실험을 하였다. 다공성 실리콘(Porous silicon, PSi)은 실온에서 일정 비율로 만든 전해질 용액($HF-C_2H_5OH-H_2O$)을 사용하여 실리콘 표면을 양극산화처리 함으로써 단순 공정만으로 실리콘 기판의 반사율을 높일 수 있다. 또한 새로운 레이어(layer)없이 기존 기판을 식각시켜 만들기 때문에 박막형 태양전지를 제작시 적용이 용이하다. 저비용, 단순공정의 이점을 살려 전류밀도에 따른 PSi의 반사방지막으로써의 특성을 비교 분석하였다.

• Proceedings of the Korean Vacuum Society Conference
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• 2013.08a
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• pp.300.1-300.1
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• 2013

반사방지막 코팅(Anti-reflection coating)은 태양전지(Solar cell), 발광다이오드(LED) 등의 반사율을 낮추어 효율을 증대시키기 위하여 사용되고 있다. 본 실험에서는 유리 기판 위에 실리콘 타겟을 이용한 Reactive magnetron sputtering 장비를 활용하여, 50~100 mTorr의 높은 공정 압력(High pressure)에서 증착하여 SiO2 반사방지막 코팅층을 형성하였다. Ellipsometer를 이용하여 SiO2 박막층의 굴절률(Refractive index)을 측정한 결과, 공정 압력에 따라 SiO2 박막이 다양한 굴절률을 가지는 것을 확인할 수 있었다. 또한, UV-Vis spectrometer를 이용하여, 450~600 nm 파장에서의 반사율(Reflectance)과 투과율(Transmittance)을 측정하여 비교, 분석하였다. 나아가 증착된 SiO2 반사방지막을 비정질 실리콘 박막 태양전지에 적용하여 효율 향상 효과를 실험하였다. 이를 활용하여 낮은 굴절률을 갖는 반사방지용 SiO2 코팅층을 형성하여 태양전지의 광 변환 효율을 상승 시킬 수 있고, 발광다이오드의 광 추출 효율을 증가시킬 있을 것으로 여겨진다.

• Proceedings of the Materials Research Society of Korea Conference
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• 1995.11a
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• pp.68-68
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• 1995

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.26 no.4
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• pp.35-40
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• 2012

In this study, the ultraviolet (UV) intensity of polymer insulator was measured using the Anti-Reflective (AR) coating lens on the occurrence of corona discharge. The UV intensity was compared before and after the AR coating. Under the 200-260[nm] of UV lens, the reflection rate before AR coating was 7.5~5.5[%] with 85-89[%] of transmission rate. After AR coating, however, the reflection rate decreased to 1.3~1.22[%] with improved transmission (97.4~97.6[%]). Then, the UV intensity by distance was measured in the polymer insulator. According to the measurement, the UV intensity increased 6.5 times at 37.5[%] of Vm/Vbd with 5[m] of distance. As distance increased, the growth rate declined. As high voltage increased, in addition, AR coating was less effective due to the count error caused by the UV sensor pulse signal overlap. Therefore, it appears that it would be more effective to detect corona discharge with 5[m] or less of distance at diagnosis of power facilities by AR coating and UV sensor sensitivity.

• Journal of the Korean institute of surface engineering
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• v.50 no.5
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• pp.345-351
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• 2017

A double-layered anti-reflective coating with hydrophilic/abrasion-resistant properties was studied using anatase titanium dioxide($TiO_2$) and silicon oxycarbide($SiO_xC_y$) thin film. $TiO_2$ and $SiO_xC_y$ thin films were sequentially deposited on a glass substrate by DC sputtering and PECVD, respectively. The optical properties were measured by UV-Vis-NIR spectrophotometer. The abrasion-resistance and the hydrophilicity were observed by a taber abrasion tester and a contact angle analyzer, respectively. The $TiO_2/SiO_xC_y$ double-layer thin film had an average transmittance of 91.3%, which was improved by 10% in the visible light region (400 to 800 nm) than that of the $TiO_2$ single-layer thin film. The contact angle of $TiO_2/SiO_xC_y$ film was $6.9^{\circ}$ right after UV exposure. After 9 days from the exposure, the contact angle was $10.2^{\circ}$, which was $33^{\circ}$ lower than that of the $TiO_2$ single-layer film. By the abrasion test, $SiO_xC_y$ film showed a superior abrasion-resistance to the $TiO_2$ film. Consequently, the $TiO_2/SiO_xC_y$ double-layer film has achieved superior anti-reflection, hydrophilicity, and abrasion resistance over the $TiO_2$ or $SiO_xC_y$ single-layer film.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2008.06a
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• pp.450-451
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• 2008

In this paper, we have designed the Anti-Reflection (AR) coating for 850, 1310 nm(multi type) and 1310, 1550 nm(multi type) wavelength ranges on the ferrule facet of special optical connector. The reflectance of the AR coated ferrule facet is designed under 5% for 850, 1310 nm(multi type) and 1310, 1550 nm (multi type). AR thin film was deposited by ion- assisted deposition in low temperature. The average return loss of the AR coated ferrule facet is 47.1 dB.

• Journal of the Korean institute of surface engineering
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• v.50 no.6
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• pp.480-485
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• 2017

Soft mold imprinting method that uses nanostructured polymer mold was investigated for anti-reflection film fabrication. The nanostructured soft mold was polyethylene terephthalate(PET) irradiated by oxygen ion beams. The collisional energy transfer between oxygen ion and the polymer surface induced cross-linking and scission reactions, resulting in self-organized nanostructures with regular patterns of the wavenumber of $5{\mu}m^{-1}$. Post processes including ultra-violet curable resin coating and delamination fabricated anti-reflection films. The imprinted resin surface also showed the consistent wavenumber, $5{\mu}m^{-1}$. Pristine PET, oxygen ion beam treated PET, and imprinted replica sample showed total transmittance of 91.04, 93.25, and 93.57-93.88%, respectively.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.3
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• pp.1-6
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• 2017

Functional coatings, such as anti-reflection and self-cleaning, are frequently applied to cover glass for photovoltaic applications. Anti-reflection coatings made of mesoporous silica film have been shown to enhance the light transmittance. $TiO_2$ photocatalyst films are often applied as a self-cleaning coating. In this study, transparent hydrophobic anti-reflective and self-cleaning coatings made of $SiO_2/TiO_2$ thin layers were fabricated on a slide glass substrate by the sol-gel and dip-coating processes. The morphology of the functional coatings was characterized by field emission scanning electron microscopy (FE-SEM) and atomic force microscopy (AFM). The optical properties of the functional coatings were investigated using an UV-visible spectrophotometer. Contact angle measurements were performed to confirm the hydrophobicity of the surface. The results showed that the $TiO_2$ films exhibit a high transmittance comparable to that of the bare slide glass substrate. The $TiO_2$ nanoparticles make the film more reflective and lead to a lower transmittance. However, the transmittance of the $SiO_2/TiO_2$ thin layers is 93.5% at 550 nm with a contact angle of $110^{\circ}$, which is higher than that of the bare slide glass (2.0%).