Stable Inverted Polymer/Fullerene Solar Cells Using a Cationic Polythiophene Modified PEDOT:PSS Cathodic Interface |
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| Authors: | David A. Rider Brian J. Worfolk Kenneth D. Harris Abeed Lalany Kevin Shahbazi Michael D. Fleischauer Michael J. Brett Jillian M. Buriak |
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| Affiliation: | 1. Department of Chemistry University of Alberta 11227 Saskatchewan Drive Edmonton, Alberta T6G 2G2 (Canada);2. NRC National Institute for Nanotechnology Edmonton, Alberta T6G 2M9 (Canada);3. Department of Electrical and Computer Engineering University of Alberta Edmonton, Alberta T6G 2V4 (Canada) |
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| Abstract: | A cationic and water‐soluble polythiophene [poly[3‐(6‐pyridiniumylhexyl)thiophene bromide] (P3PHT+Br?)] is synthesized and used in combination with anionic poly(3,4‐ethylenedioxythiophene):poly(p‐styrenesulfonate) (PEDOT:PSS)? to produce hybrid coatings on indium tin oxide (ITO). Two coating strategies are established: i) electrostatic layer‐by‐layer assembly with colloidal suspensions of (PEDOT:PSS)?, and ii) modification of an electrochemically prepared (PEDOT:PSS)? film on ITO. The coatings are found to modify the work function of ITO such that it could act as a cathode in inverted 2,5‐diyl‐poly(3‐hexylthiophene) (P3HT)/[6,6]‐phenyl‐C61‐butyric acid methyl ester (PCBM) polymer photovoltaic cells. The interfacial modifier created from the layer‐by‐layer assembly route is used to produce efficient inverted organic photovoltaic devices (power conversion efficiency ～2%) with significant long‐term stability in excess of 500 h. |
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| Keywords: | polythiophene layer‐by‐layer assembly electrochemical deposition organic photovoltaics fullerene |
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