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

Kettle, J. and Bristow, N. and Gethin, D.T. and Tehrani, Z. and Moudam, O. and Li, B. and Katz, E.A. and dos Reis Benatto, G.A. and Krebs, F.C. (2015) Printable luminescent down shifter for enhancing efficiency and stability of organic photovoltaics. Solar Energy Materials and Solar Cells, 144. pp. 481-487. DOI: 10.1016/j.solmat.2015.09.037

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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.

Item Type: Article
Subjects: Research Publications
Departments: College of Physical and Applied Sciences > School of Electronic Engineering
Date Deposited: 04 Dec 2015 03:31
Last Modified: 23 Oct 2016 02:38
ISSN: 0927-0248
URI: http://e.bangor.ac.uk/id/eprint/5921
Identification Number: DOI: 10.1016/j.solmat.2015.09.037
Publisher: Elsevier
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