Charge Separation in Type II Tunneling Multilayered Structures of CdTe and CdSe Nanocrystals Directly Proven by Surface Photovoltage Spectroscopy

Charge separation and diffusion in type II multilayered structures of CdTe and CdSe nanocrystals with a polymer spacer are unambiguously proven by surface photovoltage spectroscopy. Holes accumulate in CdTe nanocrystal layers, and the electrons in CdSe nanocrystal layers. An increase of thickness of...

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Published inJournal of the American Chemical Society Vol. 132; no. 17; pp. 5981 - 5983
Main Authors Gross, Dieter, Mora-Seró, Iván, Dittrich, Thomas, Belaidi, Abdelhak, Mauser, Christian, Houtepen, Arjan J, Como, Enrico Da, Rogach, Andrey L, Feldmann, Jochen
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 05.05.2010
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Summary:Charge separation and diffusion in type II multilayered structures of CdTe and CdSe nanocrystals with a polymer spacer are unambiguously proven by surface photovoltage spectroscopy. Holes accumulate in CdTe nanocrystal layers, and the electrons in CdSe nanocrystal layers. An increase of thickness of the polymer spacer strongly decreases the charge separation efficiency. Surface photovoltage transients demonstrate diffusion of the separated charges over several layers of the same kind of nanocrystals.
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ISSN:0002-7863
1520-5126
DOI:10.1021/ja101629c