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- 저자 : Muller-Meskamp, L. (검색결과 3 건)
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Alternative transparent electrodes for Low-cost, flexible small-molecule organic solar cells
김용현,( Lars Muller Meskamp ),( Karl Leo ) 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
In recent years, there has been a rapid progress in the development of small-molecule organic photovoltaic cells with the power conversion efficiency reaching 12.0%. Besides high efficiency, the development of transparent conducting electrodes is of great importance for low cost and flexible organic solar cells. In this work, we have developed lowcost, efficient, semi-transparent small-molecule organic solar cells based on various alternative transparent electrodes, such as highly conductive polymers, ZnO, carbon nanotubes, doped C60, and conducting polymer/metal grid electrodes. These devices are carefully optimized by doping techniques for electrodes and interfacial layers. These results demonstrate that small-molecule organic solar cells based on alternative electrodes, optimized by doping technologies, have a promising future for practical applications in efficient, low-cost, flexible and semi-transparent device manufacturing.
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PEDOT:PSS 투명전극의 솔벤트 도핑 농도와 홀 이동층의 두께에 따른 유기태양전지의 특성 연구
김용현 ( Yong Hyun Kim ),( Lars Muller Meskamp ),( Karl Leo ) 한국화상학회 2014 한국화상학회지 Vol.20 No.4
유기태양전지의 투명전극으로서 기존의 값비싸고 깨지기 쉬운 Indium Tin Oxide (ITO) 전극을 대체하고자, 전도성 고분자인 poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)를 적용하였다. 솔벤트의 도핑농도에 따른 PEDOT:PSS 박막의 전기 전도도와 표면 거칠기의 특성 변화를 관찰하고, 그 결과가 PEDOT:PSS를 투명전극으로 사용한 유기태양전지의 특성에 미치는 영향을 연구하였다. PEDOT:PSS의 솔벤트 농도가 증가함에 따라, 박막의 표면 거칠기가 증가하고, 이는 유기태양전지의 단락전류의 변화를 야기했다. 또한, 소자의 홀 이동층이 얇아짐에 따라 광활성층의 단파장영역의 광흡수가 증가하는 것을 관찰할 수 있었다. Indium tin oxide (ITO) is the most common transparent electrode for organic solar cells due to its high electrical conductivity and transmittance. However, the ITO film significantly increases device costs and its brittleness limits the applications in flexible electronics. Here, a highly conductive polymer, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is studied as an alternative electrode for organic solar cells. The effect of solvent doping concentration on the electrical and surface structural properties of PEDOT:PSS thin films is investigated. It is observed that, with increasing a solvent concentration in PEDOT:PSS films, surface roughness of PEDOT:PSS electrodes increases, causing the change of short circuit current densities in devices. In addition, a light absorption property at short wavelengths is enhanced by decreasing the thickness of hole transport layers of organic solar cells.
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Chang, H. W.,Kim, Y. H.,Lee, J.,Hofmann, S.,Lussem, B.,Muller-Meskamp, L.,Gather, M. C.,Leo, K.,Wu, C. C. Elsevier Science B.V., Amsterdam. 2014 Organic electronics Vol.15 No.5
In this work, we demonstrate color-stable, ITO-free white organic light-emitting diodes (WOLEDs) with enhanced efficiencies by combining the high-conductivity conducting polymer PEDOT:PSS as transparent electrode and a nanoparticle-based scattering layer (NPSL) as the effective optical out-coupling layer. In addition to efficiency enhancement, the NPSL is also beneficial to the stabilization of electroluminescent spectra/colors over viewing angles. Both the PEDOT:PSS and the NPSL can be fabricated by simple, low-temperature solution processing. The integration of both solution-processable transparent electrodes and light extraction structures into OLEDs is particularly attractive for applications since they simultaneously provide manufacturing, cost and efficiency advantages. (C) 2014 Elsevier B.V. All rights reserved.
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