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

Renee Kroon (Institutionen för kemi och kemiteknik, Polymerteknologi) ; A. Melianas ; Wenliu Zhuang (Institutionen för kemi och kemiteknik, Polymerteknologi) ; J. Bergqvist ; Amaia Diaz de Zerio Mendaza (Institutionen för kemi och kemiteknik, Polymerteknologi) ; Timothy Steckler (Institutionen för kemi och kemiteknik, Polymerteknologi) ; L. Y. Yu ; S. J. Bradley ; C. Musumeci ; Desta Antenehe Gedefaw (Institutionen för kemi och kemiteknik, Polymerteknologi) ; T. Nann ; A. Amassian ; Christian Müller (Institutionen för kemi och kemiteknik, Polymerteknologi) ; O. Inganas ; Mats R. Andersson (Institutionen för kemi och kemiteknik, Polymerteknologi)
Polymer Chemistry (1759-9954). Vol. 6 (2015), 42, p. 7402-7409.
[Artikel, refereegranskad vetenskaplig]

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 similar to 0.80-0.84 V, however the selenophene-based polymer displays a higher fill factor of similar to 0.70 vs. similar to 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 similar to 12 mA cm(-2). Despite the relatively low molecular weight of both materials, a very robust power conversion efficiency similar to 7% is achieved for the selenophene-based polymer, while the thienothiophene-based polymer demonstrates only a moderate maximum PCE of similar to 5.5%. Hence, the favorable effects of selenophene incorporation on the photovoltaic performance of pentacyclic lactam-based conjugated polymers are clearly demonstrated.

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Denna post skapades 2015-12-09.
CPL Pubid: 227723

 

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Institutioner (Chalmers)

Institutionen för kemi och kemiteknik, Polymerteknologi

Ämnesområden

Polymerkemi

Chalmers infrastruktur