Journal
MACROMOLECULAR CHEMISTRY AND PHYSICS
Volume 218, Issue 5, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/macp.201600502
Keywords
energy loss; fullerenes; morphology; organic solar cells; semiconducting polymer
Categories
Funding
- European Research Council under the European Union's Seventh Framework Programme (FP)
- European Research Council [339031]
- Ministry of Education, Culture and Science [024.001.035]
- Dutch Polymer Institute (DPI) [734]
- European Research Council (ERC) [339031] Funding Source: European Research Council (ERC)
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Six poly(phenylene-alt-dithienobenzothiadiazole)-based polymers have been synthesized for application in polymer-fullerene solar cells. Hydrogen, fluorine, or nitrile substitution on benzothiadiazole and alkoxy or ester substitution on the phenylene moiety are investigated to reduce the energy loss per converted photon. Power conversion efficiencies (PCEs) up to 6.6% have been obtained. The best performance is found for the polymer-fullerene combination with distinct phase separation and crystalline domains. This improves the maximum external quantum efficiency for charge formation and collection to 66%. The resulting higher photocurrent compensates for the relatively large energy loss per photon (E-loss = 0.97 eV) in achieving a high PCE. By contrast, the poly-mer that provides a reduced energy loss (Eloss = 0.49 eV) gives a lower photocurrent and a reduced PCE of 1.8% because the external quantum efficiency of 17% is limited by a suboptimal morphology and a reduced driving force for charge transfer.
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