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Hole and electron effective masses in single InP nanowires with a Wurtzite-Zincblende homojunction
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Tedeschi, Davide, Fonseka, H. Aruni, Blundo, Elena, Granados del Águila, Andrés, Guo, Yanan, Tan, Hark H., Christianen, Peter C. M., Jagadish, Chennupati, Polimeni, Antonio and De Luca, Marta (2020) Hole and electron effective masses in single InP nanowires with a Wurtzite-Zincblende homojunction. ACS Nano, 14 (9). pp. 11613-11622. doi:10.1021/acsnano.0c04174
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WRAP-Hole-electron-effective-masses-single-InP-nanowires-Wurtzite-Zincblende-homojunction-Fonseka-2020.pdf - Accepted Version - Requires a PDF viewer. Download (1118Kb) | Preview |
Official URL: https://doi.org/10.1021/acsnano.0c04174
Abstract
The formation of wurtzite (WZ) phase in III–V nanowires (NWs) such as GaAs and InP is a complication hindering the growth of pure-phase NWs, but it can also be exploited to form NW homostructures consisting of alternate zincblende (ZB) and WZ segments. This leads to different forms of nanostructures, such as crystal-phase superlattices and quantum dots. Here, we investigate the electronic properties of the simplest, yet challenging, of such homostructures: InP NWs with a single homojunction between pure ZB and WZ segments. Polarization-resolved microphotoluminescence (μ-PL) measurements on single NWs provide a tool to gain insights into the interplay between NW geometry and crystal phase. We also exploit this homostructure to simultaneously measure effective masses of charge carriers and excitons in ZB and WZ InP NWs, reliably. Magneto-μ-PL measurements carried out on individual NWs up to 29 T at 77 K allow us to determine the free exciton reduced masses of the ZB and WZ crystal phases, showing the heavier character of the WZ phase, and to deduce the effective mass of electrons in ZB InP NWs (me= 0.080 m0). Finally, we obtain the reduced mass of light-hole excitons in WZ InP by probing the second optically permitted transition Γ7C ↔ Γ7uV with magneto-μ-PL measurements carried out at room temperature. This information is used to extract the experimental light-hole effective mass in WZ InP, which is found to be mlh = 0.26 m0, a value much smaller than the one of the heavy hole mass. Besides being a valuable test for band structure calculations, the knowledge of carrier masses in WZ and ZB InP is important in view of the optimization of the efficiency of solar cells, which is one of the main applications of InP NWs.
| Item Type: | Journal Article | ||||||||||||||||||||||||
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| Subjects: | Q Science > QC Physics T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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| Divisions: | Faculty of Science > Physics | ||||||||||||||||||||||||
| SWORD Depositor: | Library Publications Router | ||||||||||||||||||||||||
| Library of Congress Subject Headings (LCSH): | Nanowires , Exciton theory , Photoluminescence, Effective mass (Physics) | ||||||||||||||||||||||||
| Journal or Publication Title: | ACS Nano | ||||||||||||||||||||||||
| Publisher: | American Chemical Society (ACS) | ||||||||||||||||||||||||
| ISSN: | 1936-086X | ||||||||||||||||||||||||
| Official Date: | 22 September 2020 | ||||||||||||||||||||||||
| Dates: |
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| Volume: | 14 | ||||||||||||||||||||||||
| Number: | 9 | ||||||||||||||||||||||||
| Page Range: | pp. 11613-11622 | ||||||||||||||||||||||||
| DOI: | 10.1021/acsnano.0c04174 | ||||||||||||||||||||||||
| Status: | Peer Reviewed | ||||||||||||||||||||||||
| Publication Status: | Published | ||||||||||||||||||||||||
| Publisher Statement: | “This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Nano, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see [insert ACS Articles on Request author-directed link to Published Work, see http://pubs.acs.org/page/policy/articlesonrequest/index.html].” | ||||||||||||||||||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||||||||||||||||||
| Copyright Holders: | © 2020 American Chemical Society | ||||||||||||||||||||||||
| RIOXX Funder/Project Grant: |
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