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dc.contributor.authorMarques dos Santos, John
dc.contributor.authorJagadamma, Lethy Krishnan
dc.contributor.authorLatif, Najwa Mousa
dc.contributor.authorRuseckas, Arvydas
dc.contributor.authorSamuel, Ifor D. W.
dc.contributor.authorCooke, Graeme
dc.identifier.citationMarques dos Santos , J , Jagadamma , L K , Latif , N M , Ruseckas , A , Samuel , I D W & Cooke , G 2019 , ' BODIPY derivatives with near infra-red absorption as small molecule donors for bulk heterojunction solar cells ' , RSC Advances , vol. 9 , no. 27 , pp. 15410-15423 .
dc.identifier.otherPURE: 259341573
dc.identifier.otherPURE UUID: 3fc623ca-291d-43bc-818a-c4241e2ce877
dc.identifier.otherBibtex: urn:3eab6ab29279c80f981566ae02772de4
dc.identifier.otherORCID: /0000-0001-9114-3522/work/58755473
dc.identifier.otherScopus: 85065998080
dc.identifier.otherORCID: /0000-0002-4339-2484/work/60196632
dc.identifier.otherWOS: 000470161800035
dc.descriptionWe are grateful to EPSRC for financial support (grants EP/L012294/1 and EP/E036244/1). JMDS thanks CAPES for funding. NML thanks the Iraqi government for funding. Theresearch data supporting this publication can be accessed at DOI:
dc.description.abstractThe study of small donor molecules as the active component of organic solar cells continues to attract considerable attention due to the range of advantages these molecules have over their polymeric counterparts. Here we report the synthesis and solar cell fabrication of three BODIPY small molecule donors. Two of the dyes feature triphenylamine and phenothiazine as donor units attached to the meso and α-positions of the BODIPY core (TPA-PTZ-DBP and PTZ-TPA-BDP). Additionally, we have synthesised a push–pull derivative featuring phenothiazine moieties in the α-positions and a nitrobenzene in the meso-position (N-TPA-BDP) in order to investigate what effect this type of functionalisation has on the photovoltaic properties compared to the other dyes. The optoelectronic properties were investigated and the dyes showed broad absorption in the near-infrared with high extinction coefficients. Electrochemical measurements indicated good reversibility for the dyes redox processes. In contrast with the all-donor functionalised systems, N-TPA-BDP demonstrated extensive HOMO–LUMO overlap by DFT. The dyes were investigated as donor molecules in bulk heterojunction solar cells along with PC71BM, and under optimal donor to acceptor ratio PTZ-TPA-BDP showed the highest PCE of 1.62%. N-PTZ-BDP:PC71BM was the only blend to further improve upon thermal annealing reaching the highest conversion efficiency among the dyes of 1.71%. A morphology comprised of finely mixed donor and acceptor components is observed for BHJ blends of each of the three donors at their optimum fullerene content. Upon thermal annealing, these morphological features remain mostly the same for PTZ-TPA-BDP:PC71BM and TPA-PTZ-DBP:PC71BM blends whereas for N-PTZ-BDP:PC71BM the domains show a larger size. These dyes show that phenothiazine functionalisation of BODIPY is useful for solar cells because it gives strong and broad absorption extending to the near infra-red and materials with reversible redox properties – both of which are desirable for organic solar cells.
dc.relation.ispartofRSC Advancesen
dc.rightsCopyright © 2019 The Author(s). Open Access Article. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.en
dc.subjectQC Physicsen
dc.subjectSDG 7 - Affordable and Clean Energyen
dc.titleBODIPY derivatives with near infra-red absorption as small molecule donors for bulk heterojunction solar cellsen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews. Centre for Biophotonicsen
dc.contributor.institutionUniversity of St Andrews. Condensed Matter Physicsen
dc.description.statusPeer revieweden

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