Realization of high efficiency inverted polymer photovoltaic cells for roll-to-roll application

Franky So

doi:10.1117/12.930986

13 September 2012 Realization of high efficiency inverted polymer photovoltaic cells for roll-to-roll application

Franky So

Proceedings Volume 8477, Organic Photovoltaics XIII; 84770H (2012) https://doi.org/10.1117/12.930986
Event: SPIE Organic Photonics + Electronics, 2012, San Diego, California, United States

Abstract

Recent progress on solution processable polymeric photovoltaic (PV) cells has drawn a lot of attention in both industry and academia. Over 8% power conversion efficiencies (PCE) have been demonstrated. In order to realize the application of organic PV, high efficiency (~10%) is not the only criteria, but also the low material and processing costs and device stability. For mostly demonstrated laboratory high efficiency cells, the devices consists of high work-function bottom anode and low work-function top cathode, e.g. Al, which is well known that the oxidation of the cathode accelerates the device degradation. In order to accommodate the issue, recent effort has been focusing on developing inverted structure. In such case, the low work-function metal can be eliminated by using a composite electrode with a work-function modifying interlayer. Solution derived TiOx and ZnO nano-particles are widely used as the interlayer. It has been shown such interlayer can efficiently reduce the work-function of bottom ITO electrode and significantly improve the device stability. However, it is often found that the inverted cells processed a lower performance than their counterpart with conventional structure. Such low efficiency is caused by the surface trap states of the nanoparticles which introduce charge recombination.

Citation Download Citation

Franky So "Realization of high efficiency inverted polymer photovoltaic cells for roll-to-roll application", Proc. SPIE 8477, Organic Photovoltaics XIII, 84770H (13 September 2012); https://doi.org/10.1117/12.930986

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KEYWORDS

Solar cells

Zinc oxide

Polymers

Composites

External quantum efficiency

Photovoltaics

Electrodes

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