Directory of Experts

Details for Professor David Cherns

Personal details
Name Professor David Cherns
Job title Senior Research Fellow in Physics
Emeritus Professor
Department School of Physics University of Bristol
School of Physics University of Bristol
Contact details This expert can be contacted via the University of Bristol Public Relations Office.

To help us deal with your request, please mention the Directory of Experts when contacting the Public Relations Office.

work+44 (0)117 331 8092
email:
Qualifications MA, PhD(Cantab), MA(Oxon), FInstP
Professional details
Keywords electron microscopy techniques
semiconductors
convergent beam electron diffraction
electron holography
piezoelectric fields
cathodoluminescence
GaN
ZnO
Areas of expertise My interests lie in the application of novel electron microscopy techniques to the analysis of defects and interfaces, particularly in semiconductors, to clarify microstructure/property relationships. My present research includes the development of new materials for field emission displays and solar cells, and studies of the role of defects in GaN light-emitting structures. In the latter, we have used transmission electron microscopy to analyse threading defects including dislocations, nanopipes and inversion domains. We have demonstrated, for the first time, that electron holography can be used to profile piezoelectric fields across InGaN quantum wells and around dislocations, and have used cathodoluminescence in a field-emission scanning electron microscope to examine the effects of individual threading defects on light emission.