Comparative studies of photochemical cross-linking methods for stabilizing the bulk hetero-junction morphology in polymer solar cells

We are here presenting a comparative study between four different types of functionalities for cross-linking. With relatively simple means bromine, azide, vinyl and oxetane could be incorporated into the side chains of the low band-gap polymer TQ1. Cross-linking of the polymers was achieved by UV-li...

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Bibliographic Details
Published in:Journal of materials chemistry 2012-12, Vol.22 (46), p.24417-24423
Main Authors: Carlé, Jon Eggert, Andreasen, Birgitta, Tromholt, Thomas, Madsen, Morten V., Norrman, Kion, Jørgensen, Mikkel, Krebs, Frederik C.
Format: Article
Language:English
Subjects:
Crosslinking
Crystallites
Illumination
Photochemical
Photovoltaic cells
Solar cells
Solvents
Stability
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Summary:We are here presenting a comparative study between four different types of functionalities for cross-linking. With relatively simple means bromine, azide, vinyl and oxetane could be incorporated into the side chains of the low band-gap polymer TQ1. Cross-linking of the polymers was achieved by UV-light illumination to give solvent resistant films and reduced phase separation and growth of PCBM crystallites in polymer:PCBM films. The stability of solar cells based on the cross-linked polymers was tested under various conditions. This study showed that cross-linking can improve morphological stability but that it has little influence on the photochemical stability which is also decisive for stable device operation under constant illumination conditions.
ISSN:0959-9428
1364-5501
DOI:10.1039/c2jm34284g