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dc.contributor.authorLin, YHLen
dc.contributor.authorKoch, Men
dc.contributor.authorBrigeman, ANen
dc.contributor.authorFreeman, DMEen
dc.contributor.authorZhao, Len
dc.contributor.authorBronstein, Hugoen
dc.contributor.authorGiebink, NCen
dc.contributor.authorScholes, GDen
dc.contributor.authorRand, BPen
dc.date.accessioned2020-02-19T13:08:34Z
dc.date.available2020-02-19T13:08:34Z
dc.date.issued2017-06-01en
dc.identifier.issn1754-5692
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/302387
dc.description.abstract© The Royal Society of Chemistry 2017. Conventional solar cells absorb photons with energy above the bandgap of the active layer while sub-bandgap photons are unharvested. One way to overcome this loss is to capture the low energy light in the triplet state of a molecule capable of undergoing triplet-triplet annihilation (TTA), which pools the energy of two triplet states into one high energy singlet state that can then be utilized. This mechanism underlies the function of an organic intermediate band solar cell (IBSC). Here, we report a solid-state organic IBSC that shows enhanced photocurrent derived from TTA that converts sub-bandgap light into charge carriers. Femtosecond resolution transient absorption spectroscopy and delayed fluorescence spectroscopy provide evidence for the triplet sensitization and upconversion mechanisms, while external quantum efficiency measurements in the presence of a broadband background light demonstrate that sub-bandgap performance enhancements are achievable in this device. The solid-state architecture introduced in this work serves as an alternative to previously demonstrated solution-based IBSCs, and is a compelling model for future research efforts in this area.
dc.language.isoenen
dc.titleEnhanced sub-bandgap efficiency of a solid-state organic intermediate band solar cell using triplet-triplet annihilationen
dc.typeArticle
prism.endingPage1475
prism.issueIdentifier6en
prism.publicationDate2017en
prism.publicationNameEnergy and Environmental Scienceen
prism.startingPage1465
prism.volume10en
dc.identifier.doi10.17863/CAM.49458
dcterms.dateAccepted2017-05-05en
rioxxterms.versionofrecord10.1039/c6ee03702jen
rioxxterms.versionAMen
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2017-06-01en
dc.contributor.orcidBronstein, Hugo [0000-0003-0293-8775]
dc.identifier.eissn1754-5706
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idEuropean Commission Horizon 2020 (H2020) ERC (679789)
cam.issuedOnline2017-05-05en


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