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Molecular Orientation, Low Band Gap Materials and New Hybrid Device Concepts for the Improvement of Plastic Solar Cells (MOLYCELL)


Organic solar cells promise a strong cost reduction of photovoltaics (PV) if fast improvements of the power efficiency and the lifetime can be achieved. There are still some crucial obstacles to overcome before a large-scale production of plastic solar cells can be considered. The latter is the clear aim of all industrial partners here involved. The feasibility of this approach will be proven with a new generation of organic PV having better efficiency ( 5% on 1cm2 glass substrate and 4% on 1cm2 flexible substrate), longer lifetime and a production cost far below those of competing technologies based on silicon. To reach this goal, the following questions will be worked out in parallel: 1. Design and synthesis of new materials to overcome the large mismatch between the currently available polymer materials absorption characteristics and the solar emission spectrum and also to improve the mediocre charge transport properties. 2. Development of two device concepts to improve efficiencies: all-organic solar cells and nanocrystal/organic hybrid solar cells : All-organic solar cells will be based on donor-acceptor bulk heterojunction built by blending of two organic materials serving as electron donor (hole semiconductor, low band gap polymers) and electron acceptor under the form of an homogeneous blend and sandwiching the organic matrix between two electrodes. One of these electrodes is transparent and the other is usually an opaque metal electrode. Two concepts will be developed to improve efficiencies: a) an innovative junction concept based on the orientation of polar molecules and b) a multi-junction bulk donor-acceptor heterojunction concept.Nanocrystal/organic hybrid solar cells will be based upon solid-state heterojunctions between nanocrystalline metal oxides and molecular/polymeric hole conductors. Two strategies will be addressed for light absorption: the sensitisation with molecular dyes and the use of absorbing polymeric hole conductors.

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31-33 Rue de la Federation

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