Charge transfer from CdTe quantum dots into a CdS thin layer

Abstract

Electron injection from CdTe quantum dots (CdTe-QDs) into ultra-thin CdS layers has been demonstrated by transient and spectral dependent surface photovoltage (SPV) methods while the thickness of the CdS layer was varied systematically between several nm and tens on nm. Signal heights and decay times at half maximum were correlated with the thickness of the CdS layer. The decay times increased by several orders of magnitude for electrons transferred across the charge-selective CdS/CdTe-QD contact in comparison to electrons photo-generated in the CdS layer. © 2011 Published by Elsevier Ltd.