Printable luminescent down shifter for enhancing efficiency and stability of organic photovoltaics

J. Kettle, N. Bristow, D.T. Gethin, Z. Tehrani, O. Moudam, B. Li, E.A. Katz, Gisele Alves dos Reis Benatto, Frederik C Krebs

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The proof of concept of using luminescent down shifting (LDS) layers as alternative UV filters for P3HT:PCBM OPVs is demonstrated using a lanthanide-based metal complex. The results are verified using a combination of indoor light soaking, with single cell devices, and outdoor performance monitoring, using a 16-cell monolithically connected OPV module. By applying the LDS layer, a ~5% relative enhancement in photocurrent is observed for both sets of devices. More significantly, indoor light soaking tests on single cell devices without encapsulation showed an 850% enhancement in the measured half-life (T50%). The OPV modules were encapsulated and tested for outdoor stability over a 70 day period in the Negev desert, Israel. The modules made with the LDS filter are shown to match the stability of those made with a commercial UV filter and outperform the modules with no filter applied, with a 51% enhancement in the measured stability (T75%). Significantly, the work provides clear experimental evidence that the LDS layer can act as a UV filter in OPVs without compromising the efficiency of the solar cell, thus providing an added benefit over commercial UV filters.
Original languageEnglish
JournalSolar Energy Materials & Solar Cells
Pages (from-to)481–487
Publication statusPublished - 2016


  • Organic photovoltaics
  • Degradation
  • Outdoor performance
  • UV filter
  • Luminescent material

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