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Improving the layer morphology of solution-processed perylene diimide organic solar cells with the use of a polymeric interlayer

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Singh R., Mróz M. M., Di Fonzo F., Cabanillas-Gonzalez J., Marchi E., Bergamini G., Müllen K., Jacob J., Keivanidis P. E.

Organic Photonics and Photovoltaics

2013

vol. 1

24-38

Herein we demonstrate a method to improve the power conversion efficiency (PCE) parameter of organic photovoltaic (OPV) devices based on the electron acceptor N,N’-bis(1- ethylpropyl)-perylene-3,4,9,10-tetracarboxylic diimide (PDI) blended with the electron donor poly(indenofluorene)-aryloctyl (PIF-Aryl). The device parameters of the short-circuit current, open-circuit voltage and fill factor are found increased after the insertion of a thin poly [9, 9-dioctylfluorene-co-N- [4-(3-methylpropyl)]-diphenylamine] (TFB) photoactive interlayer between the hole-collecting electrode and the photoactive layer of the device. Unlike to most of the cases where interlayers serve as charge extractors, in our system the polymeric interlayer serves as a morphology modifying agent that drives the PDI component to segregate better at the interface with the device cathode; that is at the carrier-collecting electrode interface, which is not in physical contact with the interlayer. The processes of energy/charge transfer of the TFB excitons to/with the PIF-Aryl:PDI top-layer are also addressed. Charge transfer reactions dominate at the TFB/PIF-Aryl:PDI interface but no significant contribution in the photocurrent generation is seen in the photoaction spectra of the bilayer device.

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1 Organic Photonics and Photovoltaics

1 2013

1 Bergamini G.

1 Cabanillas-Gonzalez J.

1 Di Fonzo F.

1 Jacob J.

1 Keivanidis P. E.

1 Marchi E.

1 Mróz M. M.

1 Müllen K.

1 Singh R.

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Improving the layer morphology of solution-processed perylene diimide organic solar cells with the use of a polymeric interlayer