AVS 51st International Symposium
    Applied Surface Science Tuesday Sessions
       Session AS-TuM

Paper AS-TuM1
Light Induced Chemically Resolved Electrical Measurements (LICREM) in XPS: Anomalous Photoresponse of CdSe Nanoparticle Films

Tuesday, November 16, 2004, 8:20 am, Room 210A

Session: Electron Spectroscopies
Presenter: H. Cohen, The Weizmann Institute of Science, Israel
Authors: H. Cohen, The Weizmann Institute of Science, Israel
S. Sarkar, The Weizmann Institute of Science, Israel
G. Hodes, The Weizmann Institute of Science, Israel
Correspondent: Click to Email
A novel method, based on electrically and optically stimulated XPS, is applied to thin overlayers of CdSe nanoparticles. Negative differential resistance is observed in the dark chemically resolved electrical measurements (CREM)@super1@. The photoresponse under variable electrical conditions shows that the system can operate in two modes, differing in the direction of photocurrent. A phenomenological model is provided, explaining the anomalous photoresponse by means of competing charge trapping mechanisms, which allow real-time shaping of space charge and, hence, of the local electric fields. @FootnoteText@ @footnote 1@ H. Cohen, Condensed Matter Archive 031147, (Nov. 20, 2003).