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Modulated charge separation at tetraphenyl porphyrin/Au interfaces

Modulated charge separation at tetraphenyl porphyrin/Au interfaces

Authors :
Yoram Shapira
Th. Dittrich
Y. Zidon
Source :
Applied Physics Letters. 90:142103
Publication Year :
2007
Publisher :
AIP Publishing, 2007.

Abstract

A frequency and temperature dependent change of the sign of modulated surface photovoltage signals from metal-free tetraphenyl porphyrin (H2TPP)∕Au junctions has been observed. The sign of the modulated photovoltage signal could be switched by using continuous (bias) illumination, while the sign depends on the wavelength of the bias light. The light induced modulation of the negative and positive charges in the H2TTP layer can be interpreted in terms of internal photoemission of electrons from Au into H2TTP and of hole escape after exciton dissociation at the H2TPP∕Au junction.

Details

ISSN :
10773118 and 00036951
Volume :
90
Database :
OpenAIRE
Journal :
Applied Physics Letters
Accession number :
edsair.doi...........0ca38449ee3ba0538659e7549289b395
Full Text :
https://doi.org/10.1063/1.2719629