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Details of Grant 

EPSRC Reference: GR/M72135/01
Title: THE ROLE OF TRAP STATES IN NANOCRYSTALLINE TIO2 ELECTRONIC DEVICES
Principal Investigator: Nelson, Professor J
Other Investigators:
Durrant, Professor JR Durrant, Dr J
Researcher Co-Investigators:
Project Partners:
Department: Dept of Physics
Organisation: Imperial College London
Scheme: Standard Research (Pre-FEC)
Starts: 01 October 1999 Ends: 31 March 2003 Value (£): 173,335
EPSRC Research Topic Classifications:
Materials Characterisation Solar Technology
EPSRC Industrial Sector Classifications:
Electronics No relevance to Underpinning Sectors
Related Grants:
Panel History:  
Summary on Grant Application Form
Dye-sensitised solar cells are one of the most promising options for low cost energy supply. In these novel devices charge separation occurs at the junction between a nanoporous, nanocrystalline Ti02 electrode and redox-active electrolyte. One factor currently limiting the photovoltaic conversion efficiency is the kinetics of electron transport and transfer within the disordered film.Both electron transport and charge recombination in these films appear to be dominated by a high density of trap states. The aim of this proposal is to characterise and measure the distribution of these trap states (d.o.s) in both model systems and functioning devices and to correlate these observations with device function.The d.o.s can be derived from measurements of potential step chronoamperometry and a.c. impedance spectroscopy. We will incorporate the measured d.o.s into an existing numerical model of dispersive electron transport in the nanocrystallline film. The model can then be applied to a range of steady state and time resolved current measurements and subsequently refined.We are requesting funds for two PhD studentships to pursue the theoretical and experimental aspect of the work and apparatus for capacitance measurements and transient photocurrent measurements.
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Organisation Website: http://www.imperial.ac.uk