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Synthesis of New Conjugated CNPPV Derivatives Containing Different Lengths of Oligothiophene Units for Organic Solar Cells
Author(s) -
Wang Fei,
Liu Yongsheng,
Wan Xiangjian,
Zhou Jiaoyan,
Long Guankui,
Chen Yongsheng
Publication year - 2010
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201000501
Subject(s) - thermal stability , condensation polymer , polymer , conjugated system , copolymer , materials science , polymer chemistry , knoevenagel condensation , absorption spectroscopy , open circuit voltage , organic solar cell , polymer solar cell , photochemistry , chemistry , organic chemistry , voltage , optics , composite material , catalysis , physics , quantum mechanics
Abstract A new series of CNPPV derivatives that contain oligothiophenes in the polymer backbone, have been synthesized by Knoevenagel polycondensation. Different lengths of oligothiophene units have been introduced to study the relationship between polymer structure and electronic properties. Thermal stability, UV‐vis absorption spectra, and electrochemical properties of the copolymers were studied. The bandgaps estimated from UV‐vis spectra varied from 1.77 to 1.83 eV. BHJ photovoltaic cells from different copolymers and a soluble fullerene derivative have been fabricated. The best PCE of 1.62% was obtained for the polymer CNPPV‐7T, with a short‐circuit current of 5.68 mA · cm −2 , open‐circuit voltage of 0.66 V, and fill factor of 43.2%.