Directory of Experts
Details for Professor David Cherns
| Personal details | |
| Name | Professor David Cherns |
| Job title | Emeritus Professor Senior Research Fellow in Physics |
| 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: public-relations@bristol.ac.uk |
| Qualifications | M.A., Ph.D.(Cantab.), M.A.(Oxon.), F.Inst.P. |
| 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. |