1. Thiophene dendrimer-based low donor content solar cells.
- Author
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Stoltzfus, Dani M., Chang-Qi Ma, Nagiri, Ravi C. R., Clulow, Andrew J., Bäuerle, Peter, Burn, Paul L., Gentle, Ian R., and Meredith, Paul
- Subjects
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THIOPHENES , *SOLAR cells , *DENDRIMERS , *FULLERENES , *X-ray reflectometry - Abstract
Low donor content solar cells containing polymeric and non-polymeric donors blended with fullerenes have been reported to give rise to efficient devices. In this letter, we report that a dendrimeric donor can also be used in solution-processed low donor content devices when blended with a fullerene. A third generation dendrimer containing 42 thiophene units (42T) was found to give power conversion efficiencies of up to 3.5% when blended with PC70BM in optimized devices. The best efficiency was measured with 10mole percent (mol. %) of 42T in PC70BM and X-ray reflectometry showed that the blends were uniform. Importantly, while 42T comprised 10 mol. % of the film, it made up 31% of the film by volume. Finally, it was found that solvent annealing was required to achieve the largest open circuit voltage and highest device efficiencies. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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