• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.32 no.4
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• pp.281-286
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• 2019

Raman spectra of a-C:H thin films deposited with an unbalanced magnetron sputtering system showed that the G peak shifted to a higher wavenumber as the target power density increased and $I_D/I_G$ ratio increased from 0.902 to 1.012. Moreover, the transmittance of a-C:H films fabricated at 60 nm tended to decrease with increasing target power density; at 550 nm in the visible light region, the transmittance decreased from 69% to 58%. The rms surface roughness values of the a-C:H thin films decreased with increasing target power density, and varied from 1.11 nm to 0.71 nm. In order to achieve efficient light trapping, the light scattering at the rough interface must be enhanced. Consequently, the surface roughness of the thin film will decrease with the target power density. Further, the refractive index and reflectivity of the a-C:H thin films increased with increasing target power density; however, the Brewster angle decreased with the target power density. Hence, dye-sensitized solar cells using an a-C:H antireflective coating increased the CE, $V_{OC}$, and $J_{SC}$ by approximately 8.6%, 5.5%, and 4.5%, respectively.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2007.11a
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• pp.212-213
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• 2007

$TiO_2$ 박막은 좋은 내구성 전기적 특성과 함께 가시광선 영역에서의 높은 투과율, 높은 굴절률을 나타내어 태양전지의 반사 방지막, TFT 절연막, 광학적 필터에 쓰이는 다층 광학적 코팅 재료 등에 쓰이며 높은 이용가치로 인해 이에 대한 많은 연구가 이루어지고 있다. 본 논문에서는 APCVD(Atmospheric Pressure Chemical Vapor Deposition)법을 이용하여 $200^{\circ}C$에서 $350^{\circ}C$까지 증착 온도를 변화시키며 $TiO_2$ 박막을 제조할 때 나타나는 광학적 특징 변화에 대한 연구를 수행하였다. 온도가 증가할수록 굴절률은 커지고 $TiO_2$, 박막안의 기공과 결함의 비율은 감소하였다. 광투과율은 UV범위 이후에서 급격한 증가를 보였으며 온도가 증가함에 따라 흡수단이 긴 파장쪽으로 이동하였다. 흡수단의 증가는 광학적 밴드갭과 연관되며 온도가 증가할수록 광학적 밴드갭은 낮아지는 것을 확인할 수 있었다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.12
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• pp.10-15
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• 2020

Ultraviolet rays, which have wavelengths smaller than 400 nm, are very harmful to the eyes. Recently, high-energy visible light was also revealed to be harmful to retinal cells. Therefore, polymer eyeglass lenses that can block UV and high-energy visible light are needed for eye health. In this study, high-refractive-index polymer eyeglass lens, n=1.67, were manufactured using the injection-mold method with the m-xylene diisocyanate monomer, 2,3-bis((2-mercaptoethyl)thio)-1-propanethiol monomer, benzotriazole UV absorber, release of alkyl phosphoric ester, dye mixture of CI solvent violet 13, and catalyst of dibutyltin dichloride mixture. A multi-layer anti-reflection coating was applied to manufactured polymer eyeglass lenses for both sides using an E-beam evaporation system. The optical properties of the manufactured lenses with the UV and high-energy visible light-blocking function were analyzed by UV-visible spectrophotometry. As a result, the polymer eyeglass lens with a UV absorber of 0.5 wt. % blocked 99% of UV and high-energy visible light shorter than 411 nm. The average transmittance of the polymer eyeglass lens with a UV absorber of 0.5wt.% was 97.9% in the range of 460 ~ 660 nm for photopic eye sensitivity higher than 10%. Therefore, clear image acquisition in photopic vision is possible.