Abstract
We studied the temperature dependence of the photocurrent spectra of a Ge-SiO2 composite thin film. We found that the spectral position of the photocurrent peak is determined by the competition between absorption and non-radiative recombination and that its temperature dependence is associated with the population variation of the energetically deep levels in the system under "thermal quenching" conditions. Combining these results with our previous deep-level transient spectroscopy data enables the association of these levels with the quantum confinement effect. We thus identify here a non-radiative recombination process associated with deep-level sensitization that stems from quantum confinement.
Original language | American English |
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Pages (from-to) | 184-188 |
Number of pages | 5 |
Journal | Thin Solid Films |
Volume | 574 |
DOIs | |
State | Published - 1 Jan 2015 |
Bibliographical note
Funding Information:This work was supported by the Israel Science Foundation (ISF) and the Israeli Ministry of Science and Technology. IB acknowledges the support of the Enrique Berman chair in Solar Energy Research at the HU and OM acknowledges the support of the Harry De Jur Chair of Applied Science at the HU.
Publisher Copyright:
© 2014 Elsevier B.V. All rights reserved.
Keywords
- Germanium
- Nanocrystals
- Photocurrent spectroscopy
- Quantum confinement