Jump to main content
Jump to site search

Issue 25, 2016
Previous Article Next Article

Synthesis, optoelectronic properties and photovoltaic performances of wide band-gap copolymers based on dibenzosilole and quinoxaline units, rivals to P3HT

Author affiliations

Abstract

Three π-conjugated alternating copolymers, based on dibenzosilole as an electron-rich unit and fluorinated or non-fluorinated quinoxaline as an electron-withdrawing unit, connected through thiazole or thiophene moieties, have been synthesized, fully characterized and applied as donors in polymer solar cells (PSCs). The three copolymers, namely PDBS-TQx, PDBS-TQxF and PDBS-TzQx, belong to the wide band-gap semiconductor materials family, and they show an absorption edge in the visible region close to 650 nm. In order to tune the position of the polymer energy levels, and in particular to decrease their HOMO energy level, we compare the use of a thiazole spacer sandwiching the electron-deficient moiety as an alternative way to the popular backbone fluorination. PSCs based on a blend of PDBS-TQx and [6,6]-phenyl-C71-butyric acid methylester (PC71BM) as an active layer have shown the best device performances with a maximum power conversion efficiency (PCE) of 5.14% for the active area of 0.28 cm2 (under standard illumination of AM 1.5G, 1000 W m−2). Interestingly this polymer outperforms P3HT:(PC61BM) solar cells used as a reference material in this work. In addition to the thorough characterization data, including among other spectroscopy techniques, XRD, OFET, AFM and nc-AFM, we discuss in detail the relationship between the chemical structures of the three polymers, their optoelectronic properties, the phase separation in blends with PC71BM and their photovoltaic performances.

Graphical abstract: Synthesis, optoelectronic properties and photovoltaic performances of wide band-gap copolymers based on dibenzosilole and quinoxaline units, rivals to P3HT

Back to tab navigation

Supplementary files

Publication details

The article was received on 29 Feb 2016, accepted on 04 May 2016 and first published on 13 May 2016


Article type: Paper
DOI: 10.1039/C6PY00370B
Author version
available:
Download author version (PDF)
Citation: Polym. Chem., 2016,7, 4160-4175
  •   Request permissions

    Synthesis, optoelectronic properties and photovoltaic performances of wide band-gap copolymers based on dibenzosilole and quinoxaline units, rivals to P3HT

    F. Caffy, N. Delbosc, P. Chávez, P. Lévêque, J. Faure-Vincent, J.-P. Travers, D. Djurado, J. Pécaut, B. Grévin, N. Lemaitre, N. Leclerc and R. Demadrille, Polym. Chem., 2016, 7, 4160
    DOI: 10.1039/C6PY00370B

Search articles by author

Spotlight

Advertisements