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Details of Grant 

EPSRC Reference: EP/M024881/1
Title: Organic-inorganic perovskite hybrid tandem solar cells
Principal Investigator: Snaith, Professor HJ
Other Investigators:
Walls, Professor JM Bowers, Dr J
Researcher Co-Investigators:
Project Partners:
Oxford Photovoltaics Limited
Department: Oxford Physics
Organisation: University of Oxford
Scheme: Standard Research
Starts: 01 May 2015 Ends: 31 October 2018 Value (£): 696,405
EPSRC Research Topic Classifications:
Solar Technology
EPSRC Industrial Sector Classifications:
Related Grants:
Panel History:
Panel DatePanel NameOutcome
26 Feb 2015 Supergen Solar Challenge Announced
Summary on Grant Application Form
Substantial manufacturing-cost reductions in mainstream silicon-wafer (c-Si) based solar cell technologies have recently been achieved mainly due to savings through economy of scale. Hence a recent forecast for the future large-scale use of photovoltaics predicts that solar energy will contribute nearly a third of newly-installed electricity generation capacity worldwide between now and 2030. To reach this goal however and to assure a widespread deployment of PV, the cost for PV-generated energy still needs to be further reduced. A large fraction of the cost of solar power is not the modules themselves, but the fixed costs of frames, inverters, installation and land, which is termed the balance of systems (BOS). The BOS is not reducing in price as fast as the module costs, hence the only sure means to continue the downward drive in the cost of PV is to enhance the absolute efficiency of the modules, without overtly increasing their cost. The key aim of this project is to realise highly efficient hybrid tandem solar cells with high stability. The specific target is to achieve a power conversion efficiency of over 25% when integrating a wide band gap perovskite solar cell with a crystalline silicon solar cell. A solar cell is composed of a light absorbing photoactive material as the main component which generates electrical current. But this layer is contacted by multiple further materials to ensure efficient charge extraction and high voltage generation in the solar cell. Our philosophy is to undertake an extremely focussed project, employ as many existing proven materials as possible, apart from the perovskite absorber layer, and integrate them judiciously within the perovskite-Silicon tandem solar cells. This will minimise the risk, and maximise the possibility of delivering an entirely stable tandem solar cell. In the process of doing so, and throughout the investigations, we will create highly efficient bifacial perovskite solar cells (which can receive light illumination from both sides) and enhance our understanding of the fundamental mechanisms occurring at the junctions between the perovskite and the charge collection layers. The project is extremely timely, since the perovskite solar cells are already at the appropriate efficiency to enhance existing PV in a tandem configuration, provided effective integration into a tandem structure can be achieved. In addition, much progress on the overall stability of the perovskite solar cells and large area processing has already been achieved, making it highly likely that the output of this project will be transferred directly into a commercial product.
Key Findings
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Organisation Website: http://www.ox.ac.uk