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Title: Correlated nanoscale analysis of the emision from wurtzite versus zincblende (In,Ga)As/GaAs nanowire core-shell quantum wells

Abstract

While the properties of wurtzite GaAs have been extensively studied during the past decade, little is known about the influence of the crystal polytype on ternary (In,Ga)As quantum well structures. We address this question with a unique combination of correlated, spatially resolved measurement techniques on core–shell nanowires that contain extended segments of both the zincblende and wurtzite polytypes. Cathodoluminescence hyperspectral imaging reveals a blue-shift of the quantum well emission energy by 75 ± 15 meV in the wurtzite polytype segment. Nanoprobe X-ray diffraction and atom probe tomography enable k·p calculations for the specific sample geometry to reveal two comparable contributions to this shift. First, there is a 30% drop in In mole fraction going from the zincblende to the wurtzite segment. Second, the quantum well is under compressive strain, which has a much stronger impact on the hole ground state in the wurtzite than in the zincblende segment. Our results highlight the role of the crystal structure in tuning the emission of (In,Ga)As quantum wells and pave the way to exploit the possibilities of three-dimensional band gap engineering in core–shell nanowire heterostructures. At the same time, we have demonstrated an advanced characterization toolkit for the investigation of semiconductor nanostructures.

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
German Research Foundation (DFG); National Science Foundation (NSF); USDOE Office of Science - Office of Basic Energy Sciences - Materials Sciences and Engineering Division; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1542074
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Nano Letters
Additional Journal Information:
Journal Volume: 19; Journal Issue: 7
Country of Publication:
United States
Language:
English
Subject:
(In,Ga)As quantum well; Nanowire; atom probe tomography; cathodoluminescence; nanofocused X-ray diffraction; polytype

Citation Formats

Lahnemann, Jonas, Hill, Megan O., Herranz, Jesus, Marquardt, Oliver, Gao, Guanhui, Al Hassan, Ali, Davtyan, Aram, Hruszkewycz, Stephan O., Holt, Martin V., Huang, Chunyi, and Calvo-Almazan, Irene. Correlated nanoscale analysis of the emision from wurtzite versus zincblende (In,Ga)As/GaAs nanowire core-shell quantum wells. United States: N. p., 2019. Web. doi:10.1021/acs.nanolett.9b01241.
Lahnemann, Jonas, Hill, Megan O., Herranz, Jesus, Marquardt, Oliver, Gao, Guanhui, Al Hassan, Ali, Davtyan, Aram, Hruszkewycz, Stephan O., Holt, Martin V., Huang, Chunyi, & Calvo-Almazan, Irene. Correlated nanoscale analysis of the emision from wurtzite versus zincblende (In,Ga)As/GaAs nanowire core-shell quantum wells. United States. doi:10.1021/acs.nanolett.9b01241.
Lahnemann, Jonas, Hill, Megan O., Herranz, Jesus, Marquardt, Oliver, Gao, Guanhui, Al Hassan, Ali, Davtyan, Aram, Hruszkewycz, Stephan O., Holt, Martin V., Huang, Chunyi, and Calvo-Almazan, Irene. Wed . "Correlated nanoscale analysis of the emision from wurtzite versus zincblende (In,Ga)As/GaAs nanowire core-shell quantum wells". United States. doi:10.1021/acs.nanolett.9b01241.
@article{osti_1542074,
title = {Correlated nanoscale analysis of the emision from wurtzite versus zincblende (In,Ga)As/GaAs nanowire core-shell quantum wells},
author = {Lahnemann, Jonas and Hill, Megan O. and Herranz, Jesus and Marquardt, Oliver and Gao, Guanhui and Al Hassan, Ali and Davtyan, Aram and Hruszkewycz, Stephan O. and Holt, Martin V. and Huang, Chunyi and Calvo-Almazan, Irene},
abstractNote = {While the properties of wurtzite GaAs have been extensively studied during the past decade, little is known about the influence of the crystal polytype on ternary (In,Ga)As quantum well structures. We address this question with a unique combination of correlated, spatially resolved measurement techniques on core–shell nanowires that contain extended segments of both the zincblende and wurtzite polytypes. Cathodoluminescence hyperspectral imaging reveals a blue-shift of the quantum well emission energy by 75 ± 15 meV in the wurtzite polytype segment. Nanoprobe X-ray diffraction and atom probe tomography enable k·p calculations for the specific sample geometry to reveal two comparable contributions to this shift. First, there is a 30% drop in In mole fraction going from the zincblende to the wurtzite segment. Second, the quantum well is under compressive strain, which has a much stronger impact on the hole ground state in the wurtzite than in the zincblende segment. Our results highlight the role of the crystal structure in tuning the emission of (In,Ga)As quantum wells and pave the way to exploit the possibilities of three-dimensional band gap engineering in core–shell nanowire heterostructures. At the same time, we have demonstrated an advanced characterization toolkit for the investigation of semiconductor nanostructures.},
doi = {10.1021/acs.nanolett.9b01241},
journal = {Nano Letters},
number = 7,
volume = 19,
place = {United States},
year = {2019},
month = {5}
}