2014
DOI: 10.1002/cphc.201402568
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Tuning the Optoelectronic Properties of Nonfullerene Electron Acceptors

Abstract: Broad spectral coverage over the solar spectrum is necessary for photovoltaic technologies and is a focus for organic solar cells. We report a series of small-molecule, nonfullerene electron acceptors containing the [(benzo[c][1,2,5]thiadiazol-4-yl)methylene]malononitrile unit as a high electron affinity component. The optoelectronic properties of these molecules were fine-tuned with the objective of attaining strong absorption at longer wavelengths by changing the low-ionization-potential moiety. The electron… Show more

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Cited by 14 publications
(11 citation statements)
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“…The devices present a short-circuit current density (J sc ) of 0.84 mA cm À2 and an open-circuit voltage (V oc ) of 1.02 V which combined with a low fill factor (FF) of 0.23 gave a power conversion efficiency (PCE) of 0.24%. Although modest this value is comparable to the results recently reported for BHJ cells based on other small size molecular acceptors tested with poly(3-hexylthiophene), 21 however it must be underlined that in our case both the donor and acceptor materials are small molecules. On the other hand, the high V oc , consistent with the deep LUMO level of compound 1 ranks among the highest reported so far for molecular BHJ cells.…”
Section: Resultssupporting
confidence: 90%
“…The devices present a short-circuit current density (J sc ) of 0.84 mA cm À2 and an open-circuit voltage (V oc ) of 1.02 V which combined with a low fill factor (FF) of 0.23 gave a power conversion efficiency (PCE) of 0.24%. Although modest this value is comparable to the results recently reported for BHJ cells based on other small size molecular acceptors tested with poly(3-hexylthiophene), 21 however it must be underlined that in our case both the donor and acceptor materials are small molecules. On the other hand, the high V oc , consistent with the deep LUMO level of compound 1 ranks among the highest reported so far for molecular BHJ cells.…”
Section: Resultssupporting
confidence: 90%
“…In recent years, due to the impressive development of nonfullerene acceptors (NFAs), power conversion efficiency (PCE) of over 14% has been achieved for single/multijunction bulk‐heterojunction (BHJ) architecture organic photovoltaics (OPVs) . In general, BHJ morphology is prepared using a one‐step method from the blend solution of donor and acceptor materials, which is denoted as the blend‐casting (BC) method herein.…”
Section: Introductionmentioning
confidence: 99%
“…The final class of NFA compounds that will be discussed is based on linear (calamitic) fused ring systems. Frequently these take the same approach as for low-bandgap D-A polymers is usually chosen to be a relatively electron-rich unit such as fluorene, [79][80][81] dibenzosilole, 82,83 indacenodithiophene, 84,85 or indacenodithieno [3,2-b]thiophene. 86 These structures all have positions that can be easily functionalised with solubilising alkyl groups, which allows the crystallinity and solubility of the material to be controlled without sterically crowding the other electron-poor sections of the molecule.…”
Section: Calamitic Small Moleculesmentioning
confidence: 99%