Show simple item record

dc.contributor.authorChandrasekaran, Nen
dc.contributor.authorGann, Een
dc.contributor.authorJain, Nen
dc.contributor.authorKumar, Aen
dc.contributor.authorGopinathan, Sen
dc.contributor.authorSadhanala, Adityaen
dc.contributor.authorFriend, Richarden
dc.contributor.authorKumar, Aen
dc.contributor.authorMcNeill, CRen
dc.contributor.authorKabra, Den
dc.date.accessioned2017-05-04T08:10:16Z
dc.date.available2017-05-04T08:10:16Z
dc.date.issued2016-08-17en
dc.identifier.issn1944-8244
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/264016
dc.description.abstractIn this paper we correlate the solar cell performance with bimolecular packing of donor:acceptor bulk heterojunction (BHJ) organic solar cells (OSCs), where interchain ordering of the donor molecule and its influence on morphology, optical properties, and charge carrier dynamics of BHJ solar cells are studied in detail. Solar cells that are fabricated using more ordered defect free 100% regioregular poly(3-hexylthiophene) (DF-P3HT) as the donor polymer show ca. 10% increase in the average power conversion efficiency (PCE) when compared to that of the solar cell fabricated using 92% regioregularity P3HT, referred to as rr-P3HT. EQE and UV-vis absorption spectrum show a clear increase in the 607 nm vibronic shoulder of the DF-P3HT blend suggesting better interchain ordering which was also reflected in the less Urbach energy (Eu) value for this system. The increase in ordering inside the blend has enhanced the hole-mobility which is calculated from the single carrier device J-V characteristics. Electroluminance (EL) studies on the DF-P3HT system showed a red-shifted peak when compared to rr-P3HT-based devices suggesting low CT energy states in DF-P3HT. The morphologies of the blend films are studied using AFM and grazing-incidence wide-angle X-ray scattering (GIWAXS) suggesting increase in the roughness and phase segregation which could enhance the internal scattering of the light inside the device and improvement in the crystallinity along alkyl and π-stacking direction. Hence, higher PCE, lower Eu, red-shifted EL emission, high hole-mobility, and better crystallinity suggest improved interchain ordering has facilitated a more delocalized HOMO state in DF-P3HT-based BHJ solar cells.
dc.description.sponsorshipWe acknowledge these organizations for funds and CEN & NCPRE IITB for device fabrication and characterizations, respectively. N.C. acknowledges the IITB-Monash Research Academy for the fellowship. A.S. and R.H.F. would like to acknowledge the support from EPSRC and the India-UK APEX project.
dc.languageengen
dc.language.isoenen
dc.publisherAmerican Chemical Society
dc.subjectcharge carrier dynamicsen
dc.subjectdefect free P3HTen
dc.subjectinterchain orderen
dc.subjectmorphologyen
dc.subjectorganic solar cellsen
dc.titleCorrelation between Photovoltaic Performance and Interchain Ordering Induced Delocalization of Electronics States in Conjugated Polymer Blendsen
dc.typeArticle
prism.endingPage20250
prism.issueIdentifier31en
prism.publicationDate2016en
prism.publicationNameACS Applied Materials and Interfacesen
prism.startingPage20243
prism.volume8en
dc.identifier.doi10.17863/CAM.9377
dcterms.dateAccepted2016-07-14en
rioxxterms.versionofrecord10.1021/acsami.6b05541en
rioxxterms.versionAMen
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2016-08-17en
dc.contributor.orcidSadhanala, Aditya [0000-0003-2832-4894]
dc.contributor.orcidFriend, Richard [0000-0001-6565-6308]
dc.identifier.eissn1944-8252
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idEngineering and Physical Sciences Research Council (EP/M023532/1)
cam.issuedOnline2016-07-14en
rioxxterms.freetoread.startdate2017-07-14


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record