Surface nano-structured PV cells

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Description of Activities:

To increase the efficiency in OPVs the route we propose, here, is to enhance light absorption by means of increasing the optical path for infrared photons inside the active material. The usual strategy in inorganic semiconductors is to increase the thickness of the active material. Such strategy cannot be applied to organic semiconductors because the mobility of the carriers is, typically, lower by several orders of magnitude when compared to inorganic semiconductors. Typically, the maximum thickness for an organic active material should not exceed 100 nm, while for inorganic semiconductors this value is one or more orders of magnitude larger. By nano-structuring OPV cell architectures we aim at decoupling the path that must be travelled by photons to be efficiently absorbed from the shortest path that charged carriers must travel to reach the electrodes. Ideally, the path length for a very efficient absorption of the infrared photons must be above 1 micron, while the path length for the charge carriers should be shorter than 100 nm to prevent recombination in the bulk hetero-junction.

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