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dc.contributor.authorPearson, Andrewen
dc.contributor.authorHopkinson, Paul Een
dc.contributor.authorCouderc, Elsaen
dc.contributor.authorDomanski, Konraden
dc.contributor.authorAbdi-Jalebi, Mojtabaen
dc.contributor.authorGreenham, Neilen
dc.date.accessioned2015-12-23T13:29:10Z
dc.date.available2015-12-23T13:29:10Z
dc.date.issued2016-01-08en
dc.identifier.citationPearson et al. Organic Electronics (2016) Vol. 30, pp. 225-236. doi: 10.1016/j.orgel.2015.12.024en
dc.identifier.issn1566-1199
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/253101
dc.description.abstractOrganic photovoltaic (OPV) devices often undergo ‘burn-in’ during the early stages of operation, this period describing the relatively rapid drop in power output before stabilising. For normal and inverted PBDTTT-EFT:PC71BM OPVs prepared according to current protocols, we identify a critical and severe light-induced burn-in phase that reduces power conversion efficiency by at least 60% after 24 hours simulated AM1.5 illumination. Such losses result primarily from a reduction in photocurrent, and for inverted devices we correlate this process in-situ with the simultaneous emergence of space-chare effects on the μs timescale. The effects of burn in are also found to reduce the lifetime of photogenerated charge carriers, as determine by in-situ transient photovoltage measurements. To identify the underlying mechanisms of this instability, a range of techniques are employed ex-situ to separate bulk- and electrode-specific degradation processes. We find that whilst the active layer nanostructure and kinetics of free charge generation remain unchanged, partial photobleaching (6% of film O.D.) of PBDTTT-EFT:PC71BM occurs alongside an increase in the ground state bleach decay time of PBDTTT-EFT. We hypothesise that this latter observation may reflect relaxation from excited states on PBDTTT-EFT that do not undergo dissociation into free charges. Owing to the poor lifetime of the reference PBDTTT-EFT:PC71BM OPVs, the fabrication protocol is modified to identify routes for stability enhancement in this initially promising solar cell blend.
dc.description.sponsorshipThe authors would like to thank SABIC for partially funding this research. PEH, EC, RHF and NCG thank the EPSRC for funding through the Supergen Supersolar Consortium (EP/J017361/1). PEH also thanks CKIK for additional funding. KD thanks the Gates Cambridge Scholarship fund. MAJ thanks Nyak Technology Ltd for PhD scholarship funding. AJP thanks David Lidzey (University of Sheffield) for use of a sample chamber for X-ray scattering measurements and Adam Brown (University of Cambridge) for UPS measurements.
dc.languageEnglishen
dc.language.isoenen
dc.publisherElsevier
dc.rightsAttribution 2.0 UK: England & Wales*
dc.rights.urihttp://creativecommons.org/licenses/by/2.0/uk/*
dc.titleCritical light instability in CB/DIO processed PBDTTT-EFT:PC71BM organic photovoltaic devicesen
dc.typeArticle
dc.description.versionThis is the final version of the article. It first appeared from Elsevier via http://dx.doi.org/10.1016/j.orgel.2015.12.024en
prism.endingPage236
prism.publicationDate2016en
prism.publicationNameOrganic Electronicsen
prism.startingPage225
prism.volume30en
dc.rioxxterms.funderEPSRC
dc.rioxxterms.projectidEP/J017361/1
rioxxterms.versionofrecord10.1016/j.orgel.2015.12.024en
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2016-01-08en
dc.contributor.orcidPearson, Andrew [0000-0003-3634-4748]
dc.contributor.orcidGreenham, Neil [0000-0002-2155-2432]
dc.identifier.eissn1878-5530
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idEPSRC (via Loughborough University) (EP/J017361/1)
cam.orpheus.successThu Jan 30 12:55:35 GMT 2020 - The item has an open VoR version.*
rioxxterms.freetoread.startdate2300-01-01


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Attribution 2.0 UK: England & Wales
Except where otherwise noted, this item's licence is described as Attribution 2.0 UK: England & Wales