Pezzoli, F. et al. (2016) Disentangling nonradiative recombination processes in Ge micro-crystals on Si substrates. Applied Physics Letters, 108, 262103. (doi: 10.1063/1.4955020)
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Abstract
We address nonradiative recombination pathways by leveraging surface passivation and dislocation management in μm-scale arrays of Ge crystals grown on deeply patterned Si substrates. The time decay photoluminescence (PL) at cryogenic temperatures discloses carrier lifetimes approaching 45 ns in band-gap engineered Ge micro-crystals. This investigation provides compelling information about the competitive interplay between the radiative band-edge transitions and the trapping of carriers by dislocations and free surfaces. Furthermore, an in-depth analysis of the temperature dependence of the PL, combined with capacitance data and finite difference time domain modeling, demonstrates the effectiveness of GeO2 in passivating the surface of Ge and thus in enhancing the room temperature PL emission.
Item Type: | Articles |
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Additional Information: | Support from Fondazione Cariplo through Grant No. 2013-0623, the Sinergia project NOVIPIX CRSII2_147639 of the Swiss National Science Foundation. |
Status: | Published |
Refereed: | Yes |
Glasgow Author(s) Enlighten ID: | Paul, Professor Douglas and Millar, Dr Ross and Gallacher, Dr Kevin |
Authors: | Pezzoli, F., Giorgioni, A., Gallacher, K., Isa, F., Biagioni, P., Millar, R. W., Gatti, E., Grilli, E., Bonera, E., Isella, G., Paul, D. J., and Miglio, L. |
College/School: | College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering |
Journal Name: | Applied Physics Letters |
Publisher: | American Institute of Physics |
ISSN: | 0003-6951 |
ISSN (Online): | 1077-3118 |
Published Online: | 28 June 2016 |
Copyright Holders: | Copyright © 2016 AIP Publishing LLC |
First Published: | First published in Applied Physics Letters 108:262103 |
Publisher Policy: | Reproduced in accordance with the copyright policy of the publisher |
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