Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 1, Issue 47, Pages 14973-14981Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta13778c
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Funding
- EPSRC Grant [EP/G060738/1, EP/I002936/1]
- Engineering and Physical Sciences Research Council [EP/I002936/1, EP/G060738/1] Funding Source: researchfish
- EPSRC [EP/G060738/1, EP/I002936/1] Funding Source: UKRI
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We report the synthesis and characterisation of five new donor-acceptor type co-polymers based on a fused dithienogermolodithiophene unit for use in photovoltaic devices. The influence of three electron deficient co-monomers, as well as the length and variety of the solubilising side-chains, on the physical and optoelectronic properties of the polymers is reported. The number and variety of alkyl side-chains is found to have a significant impact on the polymer aggregation and film morphology, with larger and more bulky side-chains leading to improved solubility and molecular weight. The influence of these properties upon the performance of bulk heterojunction solar cells is shown.
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