Jump to main content
Jump to site search

Issue 42, 2015
Previous Article Next Article

Comparison of selenophene and thienothiophene incorporation into pentacyclic lactam-based conjugated polymers for organic solar cells

Author affiliations

Abstract

In this work, we compare the effect of incorporating selenophene versus thienothiophene spacers into pentacyclic lactam-based conjugated polymers for organic solar cells. The two cyclic lactam-based copolymers were obtained via a new synthetic method for the lactam moiety. Selenophene incorporation results in a broader and red-shifted optical absorption while retaining a deep highest occupied molecular orbital level, whereas thienothienophene incorporation results in a blue-shifted optical absorption. Additionally, grazing-incidence wide angle X-ray scattering data indicates edge- and face-on solid state order for the selenophene-based polymer as compared to the thienothiophene-based polymer, which orders predominantly edge-on with respect to the substrate. In polymer : PC71BM bulk heterojunction solar cells both materials show a similar open-circuit voltage of ∼0.80–0.84 V, however the selenophene-based polymer displays a higher fill factor of ∼0.70 vs. ∼0.65. This is due to the partial face-on backbone orientation of the selenophene-based polymer, leading to a higher hole mobility, as confirmed by single-carrier diode measurements, and a concomitantly higher fill factor. Combined with improved spectral coverage of the selenophene-based polymer, as confirmed by quantum efficiency experiments, it offers a larger short-circuit current density of ∼12 mA cm−2. Despite the relatively low molecular weight of both materials, a very robust power conversion efficiency ∼7% is achieved for the selenophene-based polymer, while the thienothiophene-based polymer demonstrates only a moderate maximum PCE of ∼5.5%. Hence, the favorable effects of selenophene incorporation on the photovoltaic performance of pentacyclic lactam-based conjugated polymers are clearly demonstrated.

Graphical abstract: Comparison of selenophene and thienothiophene incorporation into pentacyclic lactam-based conjugated polymers for organic solar cells

Back to tab navigation

Supplementary files

Publication details

The article was received on 05 Aug 2015, accepted on 31 Aug 2015 and first published on 08 Sep 2015


Article type: Paper
DOI: 10.1039/C5PY01245G
Author version
available:
Download author version (PDF)
Polym. Chem., 2015,6, 7402-7409

  •   Request permissions

    Comparison of selenophene and thienothiophene incorporation into pentacyclic lactam-based conjugated polymers for organic solar cells

    R. Kroon, A. Melianas, W. Zhuang, J. Bergqvist, A. Diaz de Zerio Mendaza, T. T. Steckler, L. Yu, S. J. Bradley, C. Musumeci, D. Gedefaw, T. Nann, A. Amassian, C. Müller, O. Inganäs and M. R. Andersson, Polym. Chem., 2015, 6, 7402
    DOI: 10.1039/C5PY01245G

Search articles by author

Spotlight

Advertisements