Journal article
Contactless Optical Characterization of Carrier Dynamics in Free-Standing InAs-InAlAs Core–Shell Nanowires on Silicon
Nano letters, Vol.19(2), pp.990-996
02/13/2019
DOI: 10.1021/acs.nanolett.8b04226
PMID: 30620205
Abstract
Contactless time-resolved optical pump-probe and external quantum efficiency measurements were performed in epitaxially grown free-standing wurtzite indium arsenide/indium aluminum arsenide (InAs-InAlAs) core-shell nanowires on Si (111) substrate from 77 to 293 K. The first independent investigation of Shockley-Read-Hall, radiative, and Auger recombination in InAs-based NWs is presented. Although the Shockley-Read-Hall recombination coefficient was found to be at least 2 orders of magnitude larger than the average experimental values of other reported InAs materials, the Auger recombination coefficient was reported to be 10-fold smaller. The very low Auger and high radiative rates result in an estimated peak internal quantum efficiency of the core-shell nanowires as high as 22% at 77 K, making these nanowires of potential interest for high-efficiency mid-infrared emitters. A greater than 2-fold enhancement in minority carrier lifetime was observed from capping nanowires with a thin InAlAs shell due to the passivation of surface defects.
Keywords: Auger recombination rate; Pump−probe spectroscopy; Shockley−Read−Hall; core−shell nanowires; minority carrier lifetime; radiative; surface and interface recombination velocity.
Details
- Title: Subtitle
- Contactless Optical Characterization of Carrier Dynamics in Free-Standing InAs-InAlAs Core–Shell Nanowires on Silicon
- Creators
- Xinxin LiKailing ZhangJulian Treu - Technical University of MunichLukas Stampfer - Technical University of MunichGregor Koblmueller - Technical University of MunichFatima ToorJohn P Prineas
- Resource Type
- Journal article
- Publication Details
- Nano letters, Vol.19(2), pp.990-996
- DOI
- 10.1021/acs.nanolett.8b04226
- PMID
- 30620205
- NLM abbreviation
- Nano Lett
- ISSN
- 1530-6984
- eISSN
- 1530-6992
- Grant note
- DOI: 10.13039/100000001, name: National Science Foundation, award: EPM-1608714
- Language
- English
- Date published
- 02/13/2019
- Academic Unit
- Electrical and Computer Engineering; Iowa Technology Institute; Physics and Astronomy; Holden Comprehensive Cancer Center
- Record Identifier
- 9984197099102771
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