Sub-glass transition annealing enhances polymer solar cell performance
Artikel i vetenskaplig tidskrift, 2014

Thermal annealing of non-crystalline polymer:fullerene blends typically results in a drastic decrease in solar cell performance. In particular aggressive annealing above the glass transition temperature results in a detrimental coarsening of the blend nanostructure. We demonstrate that mild annealing below the glass transition temperature is a viable avenue to control the nanostructure of a non-crystalline thiophene–quinoxaline copolymer:fullerene blend. Direct imaging methods indicate that coarsening of the blend nanostructure can be avoided. However, a combination of absorption and luminescence spectroscopy reveals that local changes in the polymer conformation as well as limited fullerene aggregation are permitted to occur. As a result, we are able to optimise the solar cell performance evenly across different positions of the coated area, which is a necessary criterion for large-scale, high throughput production.

Författare

J. Bergqvist

Linkopings universitet

Camilla Lindqvist

Chalmers, Kemi- och bioteknik, Polymerteknologi

Olof Bäcke

Chalmers, Teknisk fysik, Eva Olsson Group

Z. F. Ma

Linkopings universitet

Z. Tang

Linkopings universitet

W. Tress

Linkopings universitet

Stefan Gustafsson

SuMo Biomaterials

Chalmers, Teknisk fysik, Eva Olsson Group

Ergang Wang

Chalmers, Kemi- och bioteknik, Polymerteknologi

Eva Olsson

Chalmers, Teknisk fysik, Eva Olsson Group

Mats Andersson

Chalmers, Kemi- och bioteknik, Polymerteknologi

Olle Inganäs

Linkopings universitet

Christian Müller

Chalmers, Kemi- och bioteknik, Polymerteknologi

Journal of Materials Chemistry A

2050-7488 (ISSN)

Vol. 2 6146-6152

Ämneskategorier

Kemi

DOI

10.1039/C3TA14165A