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Light trapping for flexible organic photovoltaics

: Park, Yoonseok; Berger, Jana; Will, Paul-Anton; Soldera, Marcos; Glatz, Bernhard; Müller-Meskamp, Lars; Taretto, Kurt; Fery, Andreas; Lasagni, Andrés-Fabián; Vandewal, Koen; Leo, Karl


Kafafi, Zakya H. (Ed.) ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Organic Photovoltaics XVII : 29 August-1 September 2016, San Diego, California
Bellingham, WA: SPIE, 2016 (Proceedings of SPIE 9942)
ISBN: 978-1-5106-0275-5
ISBN: 978-1-5106-0276-2
Paper 994211
Conference "Organic Photovoltaics" <17, 2016, San Diego/Calif.>
Fraunhofer IWS ()
organic photovoltaics; electrodes; polymers; lasers; nanoparticles

Here we investigate light trapping substrates and electrodes for enhancing the performance of organic photovoltaics (OPVs). Their power conversion efficiency (PCE) can be improved by a factor of 1.16 using laser patterned PET substrates and by a factor of 1.13 using commercial, structured display films. Furthermore, we prepare light trapping electrodes using as flexible conductive polymer with embedded TiO2 nanoparticles, improving the PCE by a factor of 1.08 as compared to a neat polymer electrode. However, nano-imprinted conductive polymer electrodes does not provide light trapping effect due to the small size (50 nm) of the structures. Moreover flexible OPV devices, integrating the above light trapping elements, show non-degraded performance after bending tests.