Interactions at tetraphenyl-porphyrin/InP interfaces observed by surface photovoltage spectroscopy

Y. Zidon; Yoram Shapira; H. Shaim; Th Dittrich

doi:10.1016/j.apsusc.2007.11.007

Interactions at tetraphenyl-porphyrin/InP interfaces observed by surface photovoltage spectroscopy

Y. Zidon, Yoram Shapira, H. Shaim, Th Dittrich^*

^*Corresponding author for this work

Department of Electrical Engineering - Physical Eng.

Research output: Contribution to journal › Article › peer-review

20 Scopus citations

Abstract

Illumination induced charge separation processes at tetraphenyl-porphyrin (H ₂ TPP)/InP interfaces are characterized. The results indicate that upon illumination an electronic transition takes place between the organic highest occupied molecular orbital (HOMO) and the InP conduction band. A 70 meV blue shift in the characteristic modulated surface photovoltage spectrum of a 50 nm H ₂ TPP film was observed when n-InP substrate was used. Such blue shift was not observed when Au, SnO ₂ :F or p-InP substrates were used. The shift may suggest a presence of an ordered interfacial sub-layer in an almost lying orientation, due to chemical or physical interactions at the interface. The results indicate that the Fermi level is unpinned at the interface. An exciton diffusion barrier in close proximity to the H ₂ TPP/n-InP interface has been demonstrated.

Original language	English
Pages (from-to)	3255-3261
Number of pages	7
Journal	Applied Surface Science
Volume	254
Issue number	11
DOIs	https://doi.org/10.1016/j.apsusc.2007.11.007
State	Published - 30 Mar 2008

Keywords

Charge separation
InP
Interfaces
Surface photovoltage
Tetraphenyl-porphyrin

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10.1016/j.apsusc.2007.11.007

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title = "Interactions at tetraphenyl-porphyrin/InP interfaces observed by surface photovoltage spectroscopy",

abstract = " Illumination induced charge separation processes at tetraphenyl-porphyrin (H 2 TPP)/InP interfaces are characterized. The results indicate that upon illumination an electronic transition takes place between the organic highest occupied molecular orbital (HOMO) and the InP conduction band. A 70 meV blue shift in the characteristic modulated surface photovoltage spectrum of a 50 nm H 2 TPP film was observed when n-InP substrate was used. Such blue shift was not observed when Au, SnO 2 :F or p-InP substrates were used. The shift may suggest a presence of an ordered interfacial sub-layer in an almost lying orientation, due to chemical or physical interactions at the interface. The results indicate that the Fermi level is unpinned at the interface. An exciton diffusion barrier in close proximity to the H 2 TPP/n-InP interface has been demonstrated.",

keywords = "Charge separation, InP, Interfaces, Surface photovoltage, Tetraphenyl-porphyrin",

author = "Y. Zidon and Yoram Shapira and H. Shaim and Th Dittrich",

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doi = "10.1016/j.apsusc.2007.11.007",

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AU - Zidon, Y.

AU - Shapira, Yoram

AU - Shaim, H.

AU - Dittrich, Th

PY - 2008/3/30

Y1 - 2008/3/30

N2 - Illumination induced charge separation processes at tetraphenyl-porphyrin (H 2 TPP)/InP interfaces are characterized. The results indicate that upon illumination an electronic transition takes place between the organic highest occupied molecular orbital (HOMO) and the InP conduction band. A 70 meV blue shift in the characteristic modulated surface photovoltage spectrum of a 50 nm H 2 TPP film was observed when n-InP substrate was used. Such blue shift was not observed when Au, SnO 2 :F or p-InP substrates were used. The shift may suggest a presence of an ordered interfacial sub-layer in an almost lying orientation, due to chemical or physical interactions at the interface. The results indicate that the Fermi level is unpinned at the interface. An exciton diffusion barrier in close proximity to the H 2 TPP/n-InP interface has been demonstrated.

AB - Illumination induced charge separation processes at tetraphenyl-porphyrin (H 2 TPP)/InP interfaces are characterized. The results indicate that upon illumination an electronic transition takes place between the organic highest occupied molecular orbital (HOMO) and the InP conduction band. A 70 meV blue shift in the characteristic modulated surface photovoltage spectrum of a 50 nm H 2 TPP film was observed when n-InP substrate was used. Such blue shift was not observed when Au, SnO 2 :F or p-InP substrates were used. The shift may suggest a presence of an ordered interfacial sub-layer in an almost lying orientation, due to chemical or physical interactions at the interface. The results indicate that the Fermi level is unpinned at the interface. An exciton diffusion barrier in close proximity to the H 2 TPP/n-InP interface has been demonstrated.

KW - Charge separation

KW - InP

KW - Interfaces

KW - Surface photovoltage

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Interactions at tetraphenyl-porphyrin/InP interfaces observed by surface photovoltage spectroscopy

Abstract

Keywords

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