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dc.contributor.authorUpama, M.
dc.contributor.authorElumalai, Naveen Kumar
dc.contributor.authorMahmud, M.
dc.contributor.authorWright, M.
dc.contributor.authorWang, D.
dc.contributor.authorXu, C.
dc.contributor.authorHaque, F.
dc.contributor.authorChan, K.
dc.contributor.authorUddin, A.
dc.date.accessioned2019-02-19T04:15:03Z
dc.date.available2019-02-19T04:15:03Z
dc.date.created2019-02-19T03:58:38Z
dc.date.issued2017
dc.identifier.citationUpama, M. and Elumalai, N.K. and Mahmud, M. and Wright, M. and Wang, D. and Xu, C. and Haque, F. et al. 2017. Interfacial engineering of electron transport layer using Caesium Iodide for efficient and stable organic solar cells. Applied Surface Science. 416: pp. 834-844.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/73878
dc.identifier.doi10.1016/j.apsusc.2017.04.164
dc.description.abstract

Polymer solar cells (PSCs) have gained immense research interest in the recent years predominantly due to low-cost, solution process-ability, and facile device fabrication. However, achieving high stability without compromising the power conversion efficiency (PCE) serves to be an important trade-off for commercialization. In line with this, we demonstrate the significance of incorporating a CsI/ZnO bilayer as electron transport layer (ETL) in the bulk heterojunction PSCs employing low band gap polymer (PTB7) and fullerene (PC71BM) as the photo-active layer. The devices with CsI/ZnO interlayer exhibited substantial enhancement of 800% and 12% in PCE when compared to the devices with pristine CsI and pristine ZnO as ETL, respectively. Furthermore, the UV and UV-ozone induced degradation studies revealed that the devices incorporating CsI/ZnO bilayer possess excellent decomposition stability (∼23% higher) over the devices with pristine ZnO counterparts. The incorporation of CsI between ITO and ZnO was found to favorably modify the energy-level alignment at the interface, contributing to the charge collection efficiency as well as protecting the adjacent light absorbing polymer layers from degradation. The mechanism behind the improvement in PCE and stability is analyzed using the electrochemical impedance spectroscopy and dark I–V characteristics.

dc.publisherElsevier BV North-Holland
dc.titleInterfacial engineering of electron transport layer using Caesium Iodide for efficient and stable organic solar cells
dc.typeJournal Article
dcterms.source.volume416
dcterms.source.startPage834
dcterms.source.endPage844
dcterms.source.issn0169-4332
dcterms.source.titleApplied Surface Science
curtin.accessStatusFulltext not available


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