Organic Photovoltaic Morphology

Collins, Brian A.; Bokel, Felicia A.; DeLongchamp, Dean M.

doi:10.1002/9783527656912.ch12

Cited by 4 publications

(1 citation statement)

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“…Furthermore, there should be bicontinuous networks within each phase to allow for transport of free charges to collective electrodes (Figure b). However, many other factors are emerging as important, including the presence of mixed phases and the nature of the molecular interfaces. − Blend film morphology is typically manipulated through trial and error by changing processing conditions such as solvent, annealing, and addition of additives . Power conversion efficiencies (PCEs) of solution processed OPVs have increased from less than 1% in 1990 to ∼11.0% for single layer devices. ,,− Much of this growth results from simultaneous progress in device processing and engineering, and the development of conjugated polymer electron donors paired with fullerene derivatives as acceptors (Figure c).…”

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confidence: 99%

Beyond Fullerenes: Designing Alternative Molecular Electron Acceptors for Solution-Processable Bulk Heterojunction Organic Photovoltaics

Sauvé

Fernando

2015

J. Phys. Chem. Lett.

136

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Organic photovoltaics (OPVs) are promising candidates for providing a low cost, widespread energy source by converting sunlight into electricity. Solution-processable active layers have predominantly consisted of a conjugated polymer donor blended with a fullerene derivative as the acceptor. Although fullerene derivatives have been the acceptor of choice, they have drawbacks such as weak visible light absorption and poor energy tuning that limit overall efficiencies. This has recently fueled new research to explore alternative acceptors that would overcome those limitations. During this exploration, one question arises: what are the important design principles for developing nonfullerene acceptors? It is generally accepted that acceptors should have high electron affinity, electron mobility, and absorption coefficient in the visible and near-IR region of the spectra. In this Perspective, we argue that alternative molecular acceptors, when blended with a conjugated polymer donor, should also have large nonplanar structures to promote nanoscale phase separation, charge separation and charge transport in blend films. Additionally, new material design should address the low dielectric constant of organic semiconductors that have so far limited their widespread application.

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