Near-infrared absorbing semitransparent organic solar cells with single step solution processed transparent top electrode

Koen Hendriks^a, Cristian Boscheri^a, Martijn Wienk^a, René Janssen^a

^aEindhoven University of Technology (TU/e), PO Box 513, Eindhoven, 5600, Netherlands

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Koen Hendriks, 216
Publication date: 5th February 2015

A near-infrared absorbing polymer (PDPP3T) is used in combination with [60]PCBM as active layer in a semitransparent solar cell device architecture. A novel composite transparent top contact is fabricated using a single solution processing step. This allows total fabrication of the device in just three straightforward coating steps without the need of thermally evaporated contacts. The formulation for this top contact consists of high conductivity PEDOT:PSS mixed with a dispersion of silver nanowires. It does not require thermal annealing after deposition in order to function and acts both as an efficient hole transporting layer and top electrode with a good combination of optical transparency and sheet resistance. The near-infrared absorption of the polymer yields semitransparent devices with a power conversion efficiency of up to 3.7% and an average visible transmittance of 47%. This is ~70% of the performance compared to an opaque reference device. Applying a 'hot-mirror' to selectively back reflect the near-infrared light, easily enhances the Jsc by 14% without the loss of visible transparency.
Transmission and Haze spectra of a completed semitransparent solar cell (the red lines indicate the range of the visible spectrum) and a photograph of a finished device on the right.

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