The fate of electron–hole pairs in polymer:fullerene blends for organic photovoltaics

Martina Causa', Jelissa De Jonghe-Risse, Mariateresa Scarongella, Jan C. Brauer, Ester Domingo, Jacques-E. Moser, Natalie Stingelin, Natalie Banerji

Research output: Contribution to journalArticlepeer-review

68 Scopus citations


There has been long-standing debate on how free charges are generated in donor: acceptor blends that are used in organic solar cells, and which are generally comprised of a complex phase morphology, where intermixed and neat phases of the donor and acceptor material co-exist. Here we resolve this question, basing our conclusions on Stark effect spectroscopy data obtained in the absence and presence of externally applied electric fields. Reconciling opposing views found in literature, we unambiguously demonstrate that the fate of photogenerated electron-hole pairs-whether they will dissociate to free charges or geminately recombine-is determined at ultrafast times, despite the fact that their actual spatial separation can be much slower. Our insights are important to further develop rational approaches towards material design and processing of organic solar cells, assisting to realize their purported promise as lead-free, third-generation energy technology that can reach efficiencies over 10%.
Original languageEnglish (US)
JournalNature Communications
Issue number1
StatePublished - Sep 2 2016


Dive into the research topics of 'The fate of electron–hole pairs in polymer:fullerene blends for organic photovoltaics'. Together they form a unique fingerprint.

Cite this