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Projects: Projects for Investigator
Reference Number EP/M024911/1
Title SuperSilicon PV: extending the limits of material performance
Status Completed
Energy Categories Renewable Energy Sources(Solar Energy, Photovoltaics) 100%;
Research Types Basic and strategic applied research 100%
Science and Technology Fields PHYSICAL SCIENCES AND MATHEMATICS (Chemistry) 40%;
PHYSICAL SCIENCES AND MATHEMATICS (Metallurgy and Materials) 30%;
UKERC Cross Cutting Characterisation Not Cross-cutting 100%
Principal Investigator Dr JD Murphy
No email address given
University of Oxford
Award Type Standard
Funding Source EPSRC
Start Date 01 September 2015
End Date 30 November 2018
Duration 39 months
Total Grant Value £1,293,323
Industrial Sectors Energy
Region South East
Programme Energy : Energy
Investigators Principal Investigator Dr JD Murphy , Materials, University of Oxford (99.995%)
  Other Investigator Professor B Hamilton , Physics and Astronomy, University of Manchester (0.001%)
Dr M P Moody , Materials, University of Oxford (0.001%)
Professor P Wilshaw , Materials, University of Oxford (0.001%)
Professor AR Peaker , Electrical & Electronic Engineering, University of Manchester (0.001%)
Prof M (Matthew ) Halsall , Electrical & Electronic Engineering, University of Manchester (0.001%)
  Industrial Collaborator Project Contact , Crystalox Limited (0.000%)
Project Contact , Australian National University, Australia (0.000%)
Project Contact , Universidade de Aveiro, Portugal (0.000%)
Project Contact , Oxford Instruments plc (0.000%)
Project Contact , University of New South Wales, Australia (0.000%)
Project Contact , Calisolar GmbH, Germany (0.000%)
Project Contact , Horiba UK Ltd (0.000%)
Project Contact , SunEdison Semiconductor, USA (0.000%)
Project Contact , SunPower Corporation, USA (0.000%)
Web Site
Abstract Climate change attributed to the emission of carbon dioxide from burning coal, oil and gas has stimulated policies which encourage the use of renewable energy via tax concessions or feed-in tariffs. These are necessary because the cost of renewable energy is more than that of energy derived from fossil fuels. The potential of photovoltaics (PV) is enormous, with sunlight delivering the world's annual energy needs every 15 minutes. Unfortunately, in most circumstances, no PV technology yet delivers adequately low cost electricity.Silicon photovoltaics (PV) are a major renewable technology, accounting for ~90% of the PV market. The present industry view is that silicon will continue to dominate the market for the foreseeable future. Apart from the capital cost, the key parameters affecting cost per kWh are efficiency and working life. The efficiency of a cell is limited by the portion of the spectrum it can use. For a simple (single-junction) cell this fundamental limit is ~30%. Many ideas which aim to go beyond this have been researched but the essential combination of low cost, long life and efficiency have proved very elusive. Commercial modules made from low cost multi-crystalline silicon generally have efficiencies in the range 13 to 16%. Commercial production using high quality (more expensive) silicon reaches 20%, where the world record efficiency for a cell is 25.8%. From our experience of silicon materials research projects over the past five or so years, we believe it will be possible to enhance the carrier lifetime of cheaper forms of silicon to provide substantially higher production conversion efficiencies of ~22%. For domestic installation - where grid parity is regarded as matching the utility supplier's price - latest figures suggest this efficiency is sufficient for parity at latitudes of up to 60 degrees from the equator.This project unites three UK silicon PV groups with four materials manufacturers, a major cell manufacturer, two materials characterisation companies, and three leading international university groups to work on some of the most pertinent issues in silicon PV materials. We aim to provide underlying science which will enable silicon PV to produce electricity at lower prices than traditional generating plants. The quality of silicon, as characterised by the minority carrier lifetime, places the upper limit on the efficiency that can be achieved. Cell processing is sufficiently mature to be able to make high efficiency cells provided the starting material is of high quality. Simplistically, the aim of this project is to remove defects which act as recombination centres and limit the efficiency of silicon PV cells. We are developing novel new methods of impurity gettering and defect passivation which have the potential to remove recombination centres which remain after existing processes. The project will also further understanding of the fundamental properties of defects in silicon, including the role of nano-precipitates in recombination, factors which prevent the fundamental carrier lifetime of silicon being reached, and the thermodynamics of impurity-dislocation interactions.

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Added to Database 10/11/15