• Title/Summary/Keyword: Solar cell application

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A performance study of organic solar cells by electrode and interfacial modification (전극과 계면간의 개질에 의한 유기태양전지의 성능 연구)

  • Kang, Nam-Su;Eo, Yong-Seok;Ju, Byeong-Kwon;Yu, Jae-Woong;Chin, Byung-Doo
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2008.11a
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    • pp.67-67
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    • 2008
  • Application of organic materials with low cost, easy fabrication and advantages of flexible device are increasing attention by research work. Recently, one of them, organic solar cells were rapidly increased efficiency with regioregular poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C61-butyricacidmethylester (PCBM) used typical material. To increased efficiency of organic solar cell has tried control of domain of PCBM and crystallite of P3HT by thermal annealing and solvent vapor annealing. [4-6] In those annealing effects, be made inefficiently efficiency, which is increased fill factor (FF), and current density by phase-separated morphology with blended P3HT and PCBM. In addition, increased conductivity by modified hole transfer layer (HTL) such as Poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS), increased both optical and conducting effect by titanium oxide (TiOx), and changed cathode material for control work function were increased efficiency of Organic solar cell. In this study, we had described effect of organic photovoltaics by conductivity of interlayer such as PEDOT:PSS and TCO (Transparent conducting oxide) such as ITO, which is used P3HT and PCBM. And, we have measured with exactly defined shadow mask to study effect of solar cell efficiency according to conductivity of hole transfer layer.

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Atomic Layer Deposition for Energy Devices and Environmental Catalysts

  • Kim, Young Dok
    • Proceedings of the Korean Vacuum Society Conference
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    • 2013.08a
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    • pp.77.2-77.2
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    • 2013
  • In this talk, I will briefly review recent results of my group related to application of atomic layer deposition (ALD) for fabricating environmental catalysts and organic solar cells. ALD was used for preparing thin films of TiO2 and NiO on mesporous silica with a mean pore size of 15 nm. Upon depositing TiO2 thin films of TiO2 using ALD, the mesoporous structure of the silica substrate was preserved to some extent. We show that efficiency for removing toluene by adsorption and catalytic oxidation is dependent of mean thickness of TiO2 deposited on silica, i.e., fine tuning of the thickness of thin film using ALD can be beneficial for preparing high-performing adsorbents and oxidation catalysts of volatile organic compound. NiO/silica system prepared by ALD was used for catalysts of chemical conversion of CO2. Here, NiO nanoparticles are well dispersed on silica and confiend in the pore, showing high catalytic activity and stability at 800oC for CO2 reforming of methane reaction. We also used ALD for surface modulation of buffer layers of organic solar cell. TiO2 and ZnO thin films were deposited on wet-chemically prepared ZnO ripple structures, and thin films with mean thickness of ~2 nm showed highest power conversion efficiency of organic solar cell. Moreover, performance of ALD-prepared organic solar cells were shown to be more stable than those without ALD. Thin films of oxides deposited on ZnO ripple buffer layer could heal defect sites of ZnO, which can act as recombination center of electrons and holes.

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A Novel Atomic Layer Deposited Al2O3 Film with Diluted NH4OH for High-Efficient c-Si Solar Cell

  • Oh, Sung-Kwen;Shin, Hong-Sik;Jeong, Kwang-Seok;Li, Meng;Lee, Horyeong;Han, Kyumin;Lee, Yongwoo;Lee, Ga-Won;Lee, Hi-Deok
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.14 no.1
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    • pp.40-47
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    • 2014
  • In this paper, $Al_2O_3$ film deposited by thermal atomic layer deposition (ALD) with diluted $NH_4OH$ instead of $H_2O$ was suggested for passivation layer and anti-reflection (AR) coating of the p-type crystalline Si (c-Si) solar cell application. It was confirmed that the deposition rate and refractive index of $Al_2O_3$ film was proportional to the $NH_4OH$ concentration. $Al_2O_3$ film deposited with 5 % $NH_4OH$ has the greatest negative fixed oxide charge density ($Q_f$), which can be explained by aluminum vacancies ($V_{Al}$) or oxygen interstitials ($O_i$) under O-rich condition. $Al_2O_3$ film deposited with $NH_4OH$ 5 % condition also shows lower interface trap density ($D_{it}$) distribution than those of other conditions. At $NH_4OH$ 5 % condition, moreover, $Al_2O_3$ film shows the highest excess carrier lifetime (${\tau}_{PCD}$) and the lowest surface recombination velocity ($S_{eff}$), which are linked with its passivation properties. The proposed $Al_2O_3$ film deposited with diluted $NH_4OH$ is very promising for passivation layer and AR coating of the p-type c-Si solar cell.

The Surface Morphology of ZnO Grown by Metal Organic Chemical Vapor Deposition for an Application of Solar Cell (태양전지응용을 위하여 MOCVD 방법으로 성장된 ZnO 박막의 기판온도에 따른 표면특성)

  • Kim, Do-Young;Kang, Hye-Min;Kim, Hyung-Jun
    • Journal of the Korean Vacuum Society
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    • v.19 no.3
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    • pp.177-183
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    • 2010
  • We report on the deposition of ZnO films using a metal organic chemical vapor deposition (MOCVD) as a function of pushing pressure and kind of reactant such as oxygen gas and water A diethylzinc (DEZ) is supplied and controlled by Ar pushing pressure through bubbling system. Oxygen gas and water are used as reactant in order to form oxidation. We knew that the surface roughness is related in the process conditions such as reactant kind and DEZ flow rate. A substrate temperature has little role of surface roughness with $O_2$ reactant. However, $H_2O$ reactant makes it to increase over the 20 times. We could get the maximum roughness of 39.16 nm at the 90 sccm of DEZ Ar flow rate, the 8 Pa of $H_2O$ vapor pressure, and the $140^{\circ}C$ of substrate temperature. In this paper, we investigated the ZnO films for the application to the light absorption layer of solar cell layer.

Electrochemical Analysis of CdTe Deposition Using Cyclovoltammetric Method for Hybrid Solar Cell Application (나노복합 태양전지를 위한 CdTe 전착 거동의 순환전류법을 이용한 전기화학적 분석)

  • Kim, Seong-Hun;Han, Wone-Keun;Jin, Hong-Sung;Lee, Jae-Ho
    • Journal of the Korean institute of surface engineering
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    • v.42 no.5
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    • pp.197-202
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    • 2009
  • The electrodeposition in acidic aqueous electrolyte bath of cadmium telluride on gold electrodes has been studied by electrochemical analysis. Conventional cyclic voltammetry using potentiostat is considered as a reliable method to study electrochemical behavior of electrodeposition of CdTe. In this paper, the mechanism of CdTe deposition and its cyclic voltammetry were studied with the Te ion concentration, temperature, potential, and scan rate. We also investigated surface morphologies using FESEM and atomic composition of Cd and Te using EDS. Atomic composition of Cd and Te were varied with Te ion concentration in the electrolyte.

Fabrication of Ozone Bubble Cleaning System and its Application to Clean Silicon Wafers of a Solar Cell

  • Yoon, J.K.;Lee, Sang Heon
    • Journal of Electrical Engineering and Technology
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    • v.10 no.1
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    • pp.295-298
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    • 2015
  • Ozone micro-bubble cleaning system was designed, and made to develop a unique technique to clean wafers by using ozone micro-bubbles. The ozone micro-bubble cleaning system consisted of loading, cleaning, rinsing, drying and un-loading zones, respectively. In case of the cleaning the silicon wafers of a solar cell, more than 99 % of cleaning efficiency was obtained by dipping the wafers at 10 ppm of ozone for 10 minutes. Both of long cleaning time and high ozone concentration in the wet-solution with ozone micro-bubbles reduced cleaning efficiency because of the re-sorption of debris. The cleaning technique by ozone micro-bubbles can be also applied to various wafers for an ingot and LED as an eco-friendly method.

Current state of Flexible metal substrate for Solar cell application (태양전지용 flexible 금속기판 개발)

  • Lee, Jaemyung;Jeong, Jaein
    • 한국신재생에너지학회:학술대회논문집
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    • 2010.11a
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    • pp.47.1-47.1
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    • 2010
  • 태양전지는 태양광을 직접 전기로 변환하는 소자로서, 무공해 신재생 에너지로 각광받고 있다. 이러한 태양전지의 상용화를 위하여 발전효율과 경제성을 높이기 위한 많은 연구가 진행되고 있으며, 특히 도심형 건물의 외장재를 태양전지로 활용하는 건물통합형 태양광 발전 (BIPV : building integrated photovoltaics)등에 대한 연구가 활발하다. 따라서, 본 조사 연구에서는 태양전지 기판소재의 요구특성을 조사하고, BIPV용으로 적용 가능한 유연한 금속기판의 개발을 위한 기술적 방법을 제시하고자 하였다. 현재 태양전지의 기판은 비정질 혹은 결정질 실리콘 기판과 라임유리 기판이 주로 사용되고 있으며, 특수용도로 고가의 폴리이미드 고분자 필름이 사용되고 있다. 그러나 BIPV의 다양한 응용을 위해서는 저가의 유연한 기판이 절실히 요구되고 있다. 스테인레스 금속박판은 인성 및 강도가 우수하고, 유연하여 다양한 형태로 가공이 가능하며, 가격이 저렴하고, 다양한 표면개질기술이 적용될 수 있다.

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Status of Low Temperature Polycrystalline Silicon Films and Solar Cells (저온 다결정 실리콘 박막 및 태양전지 연구개발동향)

  • 이정철;김석기;윤경훈;송진수;박이준
    • Proceedings of the IEEK Conference
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    • 2003.07b
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    • pp.1113-1116
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    • 2003
  • This review article gives a comprehensive compilation of recent developments in low temperature deposited poly Si flms, also known as microcrystalline silicon. The development of various ion energy suppression techniques for plasma enhanced chemical vapour deposition and ionless depositions such as HWCVD and expanding thermal plasma, and their effect on the material and solar cell efficiencies are described. A correlation between ef.ciency and the two most important process parameters, i.e., growth rate and process temperature is carried out. Finally, the application of these poly Si cells in multijunction cell structures and the best efficiencies worldwide by various deposition techniques are discussed.

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