Efficient multi-junction organic solar cells based on small molecules

Marieta Levichkova^a

^aHeliatek GmbH, Treidlerstraße 3, Dresden, 01139, Germany

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, Marieta Levichkova, 136
Publication date: 5th February 2015

Heliatek is a global leader in small molecule organic photovoltaics (OPV). We have proved that small molecule solar cells are capable of competing with inorganic thin film solar cells reaching maximum cell efficiencies in the lab of 12%. Currently, Heliatek is establishing a stable and efficient roll-to-roll (R2R) production line for organic solar films. The cells from production are thin, light and flexible. Additionally, OPV can be produced in various transparency levels and colors, opening a broad range of new application opportunities in the filed of building integrated PV and automotive. In OPV, high conversion efficiencies require multi-junction devices comprising stacked cells of complementary absorbers. Current matching of the sub-cells is thus crucial to optimizing the performance of the photovoltaic device. The p-i-n device concept of Heliatek facilitates simple stacking of single cells and optimization of thin film optics regarding interference effects. Here, we show results of optical engineering of multi-junction (tandem/triple) cell stacks consisting of in-house developed visible and near-infrared absorber oligomers. Modelled parameters are compared with current-voltage and external quantum efficiency measurements. The optimized device architectures showing high efficiency and stable performance in the lab are transferred to the Heliatek R2R production line. Currently, Heliatek is processing tandem solar modules with up to 7% efficiency on active area in a fully integrated vacuum R2R process.

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