Details of Grant 

EPSRC Reference:	GR/L99456/01
Title:	A NOVEL IMAGING TECHNIQUE-SCANNING PHOTO-INDUCED IMPEDANCE MICROSCOPY (SPIM)
Principal Investigator:	Krause, Professor S
Other Investigators:
Researcher Co-Investigators:
Project Partners:	Humboldt University Berlin
Department:	Chemistry
Organisation:	University of Sheffield
Scheme:	Standard Research (Pre-FEC)
Starts:	20 February 1998	Ends:	19 February 2001	Value (£):	40,518
EPSRC Research Topic Classifications:	Instrumentation Eng. & Dev.
EPSRC Industrial Sector Classifications:	No relevance to Underpinning Sectors
Related Grants:
Panel History:
Summary on Grant Application Form
AC impedance spectroscopy is a valuable tool in the characterisation of electrochemical systems and new materials. However, the results obtained using this method are always surface averaged. From this restriction arises the need to develop a new technique which is suitable for imaging the complex impedance of electrochemical and solid state systems with a good spatial resolution. In this programme we will develop a measurement system based on photocurrent measurements at field effect structures. A silicon / silicon dioxide structure serves as substrate for the system under investigation. A light beam which is focused onto the back of the silicon substrate and modulated with different frequencies will result in photocapacitive currents containing information about the local impedance of the system. The information that can be obtained using this method would exceed by far, that provided by other imaging methods such as scanning electrochemical microscopy. The new technique will allow the characterisation of thin dielectric films in the gas phase or electrolyte solutions. Thus, the method is applicable to a wide range of materials and experimental conditions. Due to the multidisciplinary character of this research, i.e. the combination of microfabrication techniques with electrochemical methods, a collaboration between chemistry and engineering departments is required.
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Organisation Website:	http://www.shef.ac.uk