Anomalous photovoltaic effect in nanocrystalline SiSi O2 composites

H. Levi Aharoni; D. Azulay; O. Millo; I. Balberg

doi:10.1063/1.2897294

Anomalous photovoltaic effect in nanocrystalline SiSi O2 composites

H. Levi Aharoni^*, D. Azulay, O. Millo, I. Balberg

^*Corresponding author for this work

Racah Institute of Physics

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

19 Scopus citations

Abstract

We have observed an anomalous photovoltaic effect in films of Si nanocrystals embedded in Si O2. Using conductive-probe atomic force microscopy and global transport measurements, we found, close to the percolation threshold of the Si crystallite phase, a large photovoltaic effect of up to about 7 V. Following the dependence of this effect on the size of the Si nanocrystals and on the relative tip position with respect to the counterelectrode, we suggest a model based on charge separation of excited electron-hole pairs governed by the size-dependent quantum confinement and charging energies.

Original language	English
Article number	112109
Journal	Applied Physics Letters
Volume	92
Issue number	11
DOIs	https://doi.org/10.1063/1.2897294
State	Published - 2008

Bibliographical note

Funding Information:
This work was supported by the Israel Science Foundation, Centers of Excellence program and by the European Union SA-NANO project.

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title = "Anomalous photovoltaic effect in nanocrystalline SiSi O2 composites",

abstract = "We have observed an anomalous photovoltaic effect in films of Si nanocrystals embedded in Si O2. Using conductive-probe atomic force microscopy and global transport measurements, we found, close to the percolation threshold of the Si crystallite phase, a large photovoltaic effect of up to about 7 V. Following the dependence of this effect on the size of the Si nanocrystals and on the relative tip position with respect to the counterelectrode, we suggest a model based on charge separation of excited electron-hole pairs governed by the size-dependent quantum confinement and charging energies.",

author = "{Levi Aharoni}, H. and D. Azulay and O. Millo and I. Balberg",

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AU - Levi Aharoni, H.

AU - Azulay, D.

AU - Millo, O.

AU - Balberg, I.

N1 - Funding Information: This work was supported by the Israel Science Foundation, Centers of Excellence program and by the European Union SA-NANO project.

PY - 2008

Y1 - 2008

N2 - We have observed an anomalous photovoltaic effect in films of Si nanocrystals embedded in Si O2. Using conductive-probe atomic force microscopy and global transport measurements, we found, close to the percolation threshold of the Si crystallite phase, a large photovoltaic effect of up to about 7 V. Following the dependence of this effect on the size of the Si nanocrystals and on the relative tip position with respect to the counterelectrode, we suggest a model based on charge separation of excited electron-hole pairs governed by the size-dependent quantum confinement and charging energies.

AB - We have observed an anomalous photovoltaic effect in films of Si nanocrystals embedded in Si O2. Using conductive-probe atomic force microscopy and global transport measurements, we found, close to the percolation threshold of the Si crystallite phase, a large photovoltaic effect of up to about 7 V. Following the dependence of this effect on the size of the Si nanocrystals and on the relative tip position with respect to the counterelectrode, we suggest a model based on charge separation of excited electron-hole pairs governed by the size-dependent quantum confinement and charging energies.

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Anomalous photovoltaic effect in nanocrystalline SiSi O2 composites

Abstract

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