Abstract
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. *E-mail : yhkim113@pknu.ac.kr
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