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Flexible, light trapping substrates for organic photovoltaics

: Park, Yoonseok; Berger, Jana; Tang, Zheng; Müller-Meskamp, Lars; Lasagni, Andrés-Fabián; Vandewal, Koen; Leo, Karl W.


Applied Physics Letters 109 (2016), No.9, Art. 093301
ISSN: 0003-6951 (Print)
ISSN: 1077-3118
Bundesministerium für Bildung und Forschung BMBF
FKZ 13N13720; UNVEiL
Journal Article
Fraunhofer IWS ()
Organic lasers; Organic solar cells; Plastic bottles

Micro-structured organic photovoltaic (OPV) devices on polyethylene terephthalate substrates are produced using direct laser interference patterning (DLIP). The performance of organic solar cells on these substrates is improved by a factor of 1.16, and a power conversion efficiency of 7.70% is achieved. We show that a shorter spatial period of the pattern allows for a stronger light trapping effect in solar cell, as it leads to a longer light path. Moreover, since the patterned structures are located on the outside of the fully encapsulated OPV devices, there are no problems with the roughness induced shunts.