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Noninvasive probing of persistent conductivity in high quality ZnCdSe/ZnSe quantum wells using surface acoustic waves
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
 
ID 480062
Author(s) Ebbecke, J.
Author(s) at UniBasel Warburton, Richard
Year 2010
Title Noninvasive probing of persistent conductivity in high quality ZnCdSe/ZnSe quantum wells using surface acoustic waves
Journal Journal of applied physics
Volume 107
Number 9
Pages / Article-Number 1399-1401
Abstract Attenuation of a surface acoustic wave is used as a highly sensitive and noninvasive probe of persistent photoconductivity effects in ZnCdSe/ZnSe quantum wells. These effects are observed over long time-scales exceeding several minutes at low temperatures. By varying the optical excitation energy and power and temperature we show that these effects arise from carriers photogenerated by interband excitation which are trapped in random potential fluctuations in the quantum wells related to compositional fluctuations. Effects related to defect levels in the band gap can be excluded and a transition of the conduction mechanism with temperature from a hopping to a percolation regime is observed. The transition temperature observed for our quantum well material is strongly reduced compared to bulk crystals. This indicates a superior structural quality giving rise to only weak potential fluctuation of less than or similar to 3 meV. (C) 2010 American Institute of Physics. [doi:10.1063/1.3373415]
Publisher American Institute of Physics
ISSN/ISBN 0021-8979
edoc-URL http://edoc.unibas.ch/dok/A5842071
Full Text on edoc No
Digital Object Identifier DOI 10.1063/1.3373415
ISI-Number WOS:000277834300482
Document type (ISI) Article
 
   

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