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Synthesis and Photovoltaic Properties of 1,8-Carbazole-Based Donor–Acceptor Type Conjugated Polymers

✍ Scribed by Hiroyuki Fujita; Tsuyoshi Michinobu

Publisher
John Wiley and Sons
Year
2012
Tongue
English
Weight
966 KB
Volume
213
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

1,8‐Diethynylcarbazole‐based conjugated polymers were synthesized by the acetylenic oxidative coupling reaction or Pd‐catalyzed Sonogashira reaction of the newly designed 3,6‐dialkylated 1,8‐diethynylcarbazole monomers. In particular, the Sonogashira polycondensation was effective for the preparation of donor–acceptor type alternating copolymers. The UV‐vis absorption and fluorescence spectra of the polymers revealed the strength of the donor–acceptor interactions as well as their self‐assembling features. The combination of electrochemical redox potentials and optical band gaps enabled the estimation of the polymer energy levels. The bulk‐heterojunction solar cells composed of these promising polymers and PCBM exhibited a photoconversion efficiency (PCE) of 0.24%. It was determined that the partial doping of the bulk‐heterojunction layer increased the open‐circuit voltage (V~oc~), but decreased the short‐circuit current (J~sc~).

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