Camphor sulfonic acid doped conducting polyaniline (PANI:CSA) was synthesized by self-stabilized dispersion
polymerization (SSDP). Well ordered polymer chains grow at the interface between aqueous and organic phase at low
temperature around -35 °C. Thus, the growing polymer chains act as a stabilizer, producing high quality polyaniline with
high electrical conductivity and with low content of structural defects. Moreover, the PANI:CSA thin film shows an
apparent Drude peak in the infrared region with a high d.c. conductivity of 550 Scm-1, and a high transmittance in the
visible region. Using this highly conducting polyaniline as a transparent electrode, flexible polymer light-emitting diodes
(PLEDs) and flexible polymer solar cells (PSCs) were fabricated on flexible poly(ethersulfone) (PES) substrates. The
flexible PLEDs show high performance with a luminance of 2300 cdm-2 and a luminous efficiency of 1.6 cdA-1. In
addition, flexible PSCs based on composites of regioregular poly
(3-hexylthiophene) (rr-P3HT) as an electron donor and
phenyl-C61-butyric acid methyl ester (PCBM) as an electron acceptor exhibit a reasonable power conversion efficiency
(PCE) of 1.8 %.
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