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dc.contributor.authorUpama, M.
dc.contributor.authorElumalai, Naveen Kumar
dc.contributor.authorMahmud, M.
dc.contributor.authorSun, H.
dc.contributor.authorWang, D.
dc.contributor.authorChan, K.
dc.contributor.authorWright, M.
dc.contributor.authorXu, C.
dc.contributor.authorUddin, A.
dc.identifier.citationUpama, M. and Elumalai, N.K. and Mahmud, M. and Sun, H. and Wang, D. and Chan, K. and Wright, M. et al. 2017. Organic solar cells with near 100% efficiency retention after initial burn-in loss and photo-degradation. Thin Solid Films.

In this article, we attempt to demonstrate a way of tackling one of the biggest challenges in the path of commercialization of organic solar cells, the initial photo-degradation of the cells known as “burn-in”. The “burn-in” phenomenon is most prominent during the first few hours of device operation under illumination and responsible for losing 25% or more fraction of the initial efficiency. To address this major issue, we have studied photo degradation of inverted organic solar cells with plain Zinc Oxide (ZnO) and Aluminum doped ZnO (AZO) as an electron transport layer over a short time period of 5 h during which the degradation is most severe. The study has been done on two different device structures containing both crystalline and amorphous polymers (Poly(3-hexylthiophene-2,5-diyl) and Poly({4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b']dithiophene-2,6-diyl}{3-fluoro-2-[(2 ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl}), respectively). Application of an AZO layer as the electron transport layer resolves the issue of photo-degradation in both cases, regardless of the polymer used in the active layer. AZO layer is found to provide less charge accumulation and better charge extraction at cathode/active layer interface. Mott-Schottky analysis shows modification of cathode interfacial layer work function and enhancement of open-circuit voltage due to the introduction of doped ZnO as electron transport layer. The exaltation persists even after the ageing of the devices. The devices with AZO layer retain their initial efficiency (almost 100%) even after photo-degradation while the device with pristine ZnO layer loses up to 60% of the initial efficiency.

dc.publisherElsevier S.A.
dc.titleOrganic solar cells with near 100% efficiency retention after initial burn-in loss and photo-degradation
dc.typeJournal Article
dcterms.source.titleThin Solid Films
curtin.accessStatusFulltext not available

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