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Stable Inverted Polymer/Fullerene Solar Cells Using a Cationic Polythiophene Modified PEDOT:PSS Cathodic Interface
Author(s) -
Rider David A.,
Worfolk Brian J.,
Harris Kenneth D.,
Lalany Abeed,
Shahbazi Kevin,
Fleischauer Michael D.,
Brett Michael J.,
Buriak Jillian M.
Publication year - 2010
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201000304
Subject(s) - materials science , pedot:pss , polythiophene , chemical engineering , indium tin oxide , fullerene , polymer solar cell , cationic polymerization , organic solar cell , layer (electronics) , polymer , conductive polymer , photoactive layer , work function , cathode , polymer chemistry , nanotechnology , organic chemistry , composite material , chemistry , engineering
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‐C 61 ‐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.