Journal
NANO LETTERS
Volume 8, Issue 11, Pages 3942-3947Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl802425r
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Funding
- F8BT
- PFB
- F8TBT
- EPSRC
- Cambridge Commonwealth Trust
- Fitzwilliam College Cambridge
- Swedish Research Council
- EPSRC [EP/E051804/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/E051804/1] Funding Source: researchfish
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Understanding and controlling nanoscale morphology is crucial to the performance of polymer bulk heterojunction solar cells, as well as other optoelectronic devices such as polymer light-emitting diodes, field-effect transistors, and sensors. In photovoltaic devices, optimum blend morphologies must be commensurate with the nanometer length scales of exciton diffusion and charge separation. We report on a generally applicable method of optimizing the phase segregation in polymer-polymer bulk heterojunctions based on tuning mixtures of low and high boiling point solvents. We have characterized the resulting blend morphologies with nanometer resolution using a transient absorption technique that probes the distribution of paths traveled by the excitons themselves prior to generating charges at an interface. Photovoltaic efficiencies are accounted for in terms of exciton diffusion, geminate pair separation, and polymer ordering, all of which are sensitive to the nanoscale morphology determined by the composition of the solvent mixture.
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