We have fabricated organic solar cells using highly conductive poly 3,4-ethylenedioxythiophene: poly styrenesulfonate (PEDOT:PSS), which are modified by add ing 5 wt. ethylene glycol ( EG) as an anode without using transparent conducting oxide (TCO). The conductivity of the modified PEDOT:PSS (PEDOT:PSS-EG) film with ethylene glycol ( EG) additive was enhanced by three orders of magnitude. With the modified PEDOT:PSS film, we investigated the transmittance of visible range light at various film thicknesses and device performance levels on ITO-free organic solar cells-based highly conductive polymer anodes. The power conversion efficiency ( PCE) was governed by the series resistance, which directly determines a short circuit current density (Jsc).
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