PP2.1 Organic Photovoltaic Devices (OPV)

Concepts envisaged or developed originally for conventional semiconductor photovoltaics can be applied to perovskite, organic photovoltaic (OPV) and dye sensitised solar cell (DSC) devices to boost their performance and manufacturability. In this section, we describe ACAP’s efforts to develop and characterise new photovoltaic materials, implement novel device concepts and develop nanomaterials for application in improved hybrid photovoltaic devices.

For organic solar cells being developed within AUSIAPV, key materials properties are:

1) high power conversion efficiency (>10%);

2) material stability during processing and in use;

3) scale-up and processability in industrial relevant solvent systems; and

4) new device architectures requiring new materials.

For organic solar cells it is expected that efficiencies for printed modules of between 8% and10% power conversion efficiency would be commercially interesting. Therefore, lab-based devices with a stable efficiency of >10% power conversion efficiency with cells over 1 cm2 will be required to initiate commercialisation plans.

Research is focused on the development of high performance p- and n-type organic semiconductor materials, triplet host materials, understanding degradation mechanisms in OPV devices, block copolymers for solvent compatibility and new materials for luminescent solar concentrators. 

Very recently, a new type of solid state thin film solar cells based on organometal halide perovskites has shown some very exciting outcomes for hybrid solar cells. The devices are made of a metal oxide film (TiO2 or Al2O3), a perovskite sensitiser and a solid state hole transport material. Due to the extraordinary light absorption and charge transport properties of the perovskites, this new type of solar cell has achieved 21% power conversion efficiency in a relatively short time, although stability of these devices remains a challenging problem.