Thiophene dendrimer-based low donor content solar cells

Dani M. Stoltzfus, Chang Qi Ma, Ravi C R Nagiri, Andrew J. Clulow, Peter Bäuerle, Paul L. Burn, Ian R. Gentle, Paul Meredith

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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 10 mole 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.

Original languageEnglish
Article number103302
Number of pages5
JournalApplied Physics Letters
Volume109
Issue number10
DOIs
Publication statusPublished - 5 Sep 2016
Externally publishedYes

Cite this

Stoltzfus, D. M., Ma, C. Q., Nagiri, R. C. R., Clulow, A. J., Bäuerle, P., Burn, P. L., Gentle, I. R., & Meredith, P. (2016). Thiophene dendrimer-based low donor content solar cells. Applied Physics Letters, 109(10), [103302]. https://doi.org/10.1063/1.4961935