Issue 12, 2011

Effect of energy level matching on the enhancement of photovoltaic response about oxide/Zn2SnO4 composites

Abstract

Four oxide/Zn2SnO4 composites (WO3/Zn2SnO4, TiO2/Zn2SnO4, α-Fe2O3/Zn2SnO4 and SnO2/Zn2SnO4) were synthesized via a sol–gel route with the molar ratio 4 : 1 of (W, Ti, Fe and Sn)/Zn. All composites present similar absorption characteristics to their one component (oxide or Zn2SnO4). The surface photovoltage spectroscopies for composites show stronger photovoltaic effects than each component before compounding under zero and the same positive bias. We also find that the separation efficiency of photogenerated charges will increase by degrees with decreasing the difference of conduction band edges between two components under the same conditions. These results are attributed to the energy level matching, and we adopt the overlapping of wave functions to explain the micro-process and physical mechanism of the separation of photogenerated charges in the composite system.

Graphical abstract: Effect of energy level matching on the enhancement of photovoltaic response about oxide/Zn2SnO4 composites

Supplementary files

Article information

Article type
Paper
Submitted
13 Jul 2010
Accepted
07 Dec 2010
First published
01 Feb 2011

J. Mater. Chem., 2011,21, 4108-4116

Effect of energy level matching on the enhancement of photovoltaic response about oxide/Zn2SnO4 composites

X. Liu, H. Zheng, Z. Zhang, X. Liu, R. Wan and W. Zhang, J. Mater. Chem., 2011, 21, 4108 DOI: 10.1039/C0JM02249G

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Spotlight

Advertisements