Anomalous photovoltaic effect in nanocrystalline SiSi O2 composites

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 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 languageAmerican English
Article number112109
JournalApplied Physics Letters
Volume92
Issue number11
DOIs
StatePublished - 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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