• Title/Summary/Keyword: thin film

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Thin film solar cell efficiency improvement using the surface plasmon effect (표면 플라즈몬 효과를 이용한 박막형 태양전지 효율향상)

  • Byun, Soo-Hwan;Soh, Hyun-Jun;Yoo, Jeong-Hoon
    • Transactions of the Society of Information Storage Systems
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    • v.8 no.2
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    • pp.39-43
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    • 2012
  • In spite of many advantages, the practical application of the thin film solar cell is restricted due to its low efficiency compared with the bulk type solar cells. This study intends to adopt the surface plasmon effect using nano particles to solve the low efficiency problem in thin film solar cells. By inserting Ag nano-particles in the absorbing layer of a thin film solar cell, the poynting vector value of the absorbing layer is increased due to the strong energy field. Increasing the value may give thin film solar cells chance to absorb more energy from the incident beam so that the efficiency of the thin film solar cell can be improved. In this work, we have designed the optimal shape of Ag nano-particle in the absorbing laser of a basic type thin film solar cell using the finite element analysis commercial package COMSOL. Design parameters are set to the particle diameter and the distance between each Ag nano-particle and by changing those parameters using the full factorial design variable set-up, we can determine optimal design of Ag nano-particles for maximizing the poynting vector value in the absorbing layer.

Homeotropic Alignment Effect of a Nematic Liquid Crystal on Oblique Deposited SiOx Thin-film with e-beam Evaporation

  • Choi, Dai-Seub
    • Transactions on Electrical and Electronic Materials
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    • v.8 no.6
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    • pp.274-277
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    • 2007
  • In this study, liquid crystal(LC) aligning capabilities for homeotropic alignment on the $SiO_x$ thin film by electron beam evaporation method were investigated. Also, the control of pretilt angles and thermal stabilities of the nematic liquid crystal(NLC) treated on $SiO_x$ thin film were investigated. A high pretilt angle of about $86.5^{\circ}$ was obtained, and also the suitable pretilt angle of the NLC on the $SiO_x$ thin film at $10{\sim}50nm$ thickness with e-beam evaporation can be achieved. The uniform LC alignment and good thermal stabilities on the $SiO_x$ thin film surfaces with electron beam evaporation can be achieved. It is considered that the LC alignment on the $SiO_x$ thin film by electron beam evaporation is attributed to elastic interaction between LC molecules and micro-grooves at the $SiO_x$ thin film surface created by evaporation.

A Study on the Characteristics of Se/ZnS Thin Film Light Amplifiers

  • Park, Gye-Choon;Chung, Hae-Duck;Lee, Jin;Yang, Hyun-Hun;Jeong, Woon-Jo;Park, Jung-Yun;Lee, Kyung-Sup
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2004.11b
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    • pp.13-14
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    • 2004
  • Using Se as a photoconductive element and ZnS as a luminescent element, a Se/ZnS thin film device for light amplifier applications was fabricated and its characteristics were investigated At various conditions of substrate temperatures, heat treatment times, and heat treatment temperatures, Se thin films and ZnS thin films were separately deposited by an EBE(Electron Beam Evaporation) method of an high accuracy in deposition rates and the optimum fabrication conditions for the Se thin film and the ZnS thin film with a hexagonal structure were obtained The Se/ZnS thin film light amplifier was fabricated by evaporating the ZnS thin film on an ITO(Indium Tin Oxide) glass and the Se thin film on the ZnS thin film in sequence.

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A Control of Pretilt Angles for Homeotropic Aligned NLC on the SiOx Thin Film Surface by Electron Beam Evaporation

  • Kang, Hyung-Ku;Han, Jin-Woo;Kang, Soo-Hee;Kim, Jong-Hwan;Kim, Oung-Hwan;Hwang, Jeoung-Yeon;Seo, Dae-Shik
    • Transactions on Electrical and Electronic Materials
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    • v.6 no.6
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    • pp.272-275
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    • 2005
  • We studied the control of pretilt angles for homeotropic aligned nematic liquid crystal (NLC) on SiOx thin film surface by $45^{\circ}$ evaporation method with electron beam system. The uniform vertical LC alignment on. the SiOx thin film surfaces with electron beam evaporation was achieved. It is considered that the LC alignment on SiOx thin film by $45^{\circ}$ electron beam evaporation is attributed to elastic interaction between LC molecules and micro-grooves at the SiOx thin film surface created by evaporation. The pretilt angles of about $3.5^{\circ}$ in aligned NLC on SiOx thin film surfaces by electron beam evaporation of $45^{\circ}$ were measured. Consequently, the high pretilt angles of the NLC on the SiOx thin film by $45^{\circ}$ oblique electron beam evaporation method can be achieved.

High Conductive Transparent Electrode of ITO/Ag/i-ZnO by In-Line Magnetron Sputtering Method (인-라인 마그네트론 스퍼터링 방법에 의한 고전도성 ITO/Ag/i-ZnO 투명전극)

  • Kim, Sungyong;Kwon, Sangjik
    • Journal of the Semiconductor & Display Technology
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    • v.14 no.3
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    • pp.33-36
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    • 2015
  • It has increased several decades in the field of Indium Tin Oxide (ITO) transparent thin film, However, a major problem with this ITO thin film application is high cost compared with other transparent thin film materials[1]. So far, in order to overcome this disadvantage, we show that a transparent ITO/Ag/i-ZnO multilayer thin film electrode would be more cost-effective and it has not only highly transparent but also conductive properties. The aim of this research has therefore been to try and establish how ITO/Ag/i-ZnO multilayer thin film would be more effective than ITO thin film. Herein, we report the properties of ITO/Ag/i-ZnO multilayer thin film by using optical spectroscopic method and measuring sheet resistance. At a certain total thickness of thin film, sheet resistance of ITO/Ag/i-ZnO multilayer was drastically decreased than ITO layer approximately $40{\Omega}/{\Box}$ at same visible light transmittance. (minimal point $5.2{\Omega}/{\Box}$). Tendency, which shows lowly sheet resistive in a certain transmittance, has been observed, hence, it should be suitable for transparent electrode device.

Plasma-polymerized Styrene Prganic thin Film as Hybrid OLEDs Encapsulation (플라즈마 중합된 Styrene을 유기박막으로 사용한 하이브리드형 OLED 봉지기술)

  • Jung, Kun-Soo;Lee, Boong-Joo;Shin, Paik-Kyun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.63 no.10
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    • pp.1412-1416
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    • 2014
  • We report thin-film organic moisture barriers based on polystyrene(PS) laminates deposition by PECVD for an encapsulation of OLEDs. The organic polystyrene thin-film has the benzene ring structure and high hydrophobic characteristics and it was polymerized by PECVD in dry process. Life time properties of Ca test were obtained 32 minutes at the RF 100W process conditions. From the AFM test, the roughness of multi-layer thin-film was more excellent rather than that of a single-layer thin-film. In addition, 5 layers of the multi-layer film properties were obtained 45 minutes. So that the optical and electrical properties were not affected with these plasma polymerized organic thin-film encapsulation. For life time improvement, the inorganic $Al_2O_3$ thin-film were deposited 5nm using ALD atomic layer deposition. The WVTR(Water Vaper Transmission Rate) value of hybrid thin-film encapsulation in the optimum process conditions was resulted by less than $10-3g/m^2/day$. From the results of experiment, plasma polymerized hybrid encapsulation was suggested as the flexible display applications.

Liquid Crystal Aligning Capabilities for Nematic Liquid Crystal on the ZrOx Thin Film Layer with E-beam Evaporation

  • Kim, Mi-Jung;Han, Jin-Woo;Kim, Young-Hwan;Kim, Byoung-Yong;Han, Jeong-Min;Moon, Hyun-Chan;Park, Kwang-Bum;Seo, Dae-Shik
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2007.06a
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    • pp.378-378
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    • 2007
  • In this study, liquid crystal (LC) aligning capabilities for homeotropic alignment on the $ZrO_x$ thin film by electron beam evaporation method were investigated. Also, the control of pretilt angles and thermal stabilities of the NLC treated on $ZrO_x$ thin film were investigated. The uniform LC alignment on the $ZrO_x$ thin film surfaces and good thermal stabilities with electron beam evaporation can be achieved. It is considerated that the LC alignment on the $ZrO_x$ thin film by electron beam evaporation is attributed to elastic interaction between LC molecules and micro-grooves at the $ZrO_x$ thin film surface created by evaporation. In addition, it can be achieved the good electro-optical (EO) properties of the VA-LCD on $ZrO_x$ thin film layer with. oblique electron beam evaporation.

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A properties of ZnO thin film deposited by magnetron sputtering and its resistivity and microstructure due to annealing (Magnetron sputtering으로 증착한 ZnO 박막의 특성과 열처리에 따른 비저항과 미세구조)

  • 이승환;성영권;김종관
    • Electrical & Electronic Materials
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    • v.10 no.2
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    • pp.126-133
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    • 1997
  • In order to apply for the gas sensing layer and the piezoelectric thin film devices, we studied the effects of magnetron sputtering conditions and annealing temperature on the electrical and structual characteristics of the ZnO thin film. The optimal deposition conditions, in order to obtain a c axis of the ZnO (002) phase thin film which is perpendicular to SiO$_{2}$/Si substrate, were like these ; substrate temperature 150.deg. C, chamber pressure 2 mtorr, R.F. power 300 watts, gas flow ratio 0.4[O$_{2}$(Ar + $O_{2}$)]. When the ZnO thin film was annealed in 600.deg. C, $O_{2}$ gas ambient for 1 hr, the resistivity was 2.6 x 10$^{2}$.ohm.cm and the grain size of ZnO thin film was less than 1 .mu.m. So the ZnO thin film acquired from above conditions can apply for the gas sensing layer which require a c axis perpendicular to the substrate surface.

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