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Modulation doping of GaAs/AlGaAs core-shell nanowires with effective defect passivation and high electron mobility.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Boland, Jessica L. Conesa-Boj, Sonia Parkinson, Patrick Tütüncüoğlu, Gözde Matteini, Federico Rüffer, Daniel Casadei, Alberto Amaduzzi, Francesca Jabeen, F. Davies, Christopher L. Joyce, Hannah. J. Herz, Laura M. Morral, Anna Fontcuberta I Johnston, Michael B. |
| Copyright Year | 2015 |
| Abstract | Reliable doping is required to realize many devices based on semiconductor nanowires. Group III-V nanowires show great promise as elements of high-speed optoelectronic devices, but for such applications it is important that the electron mobility is not compromised by the inclusion of dopants. Here we show that GaAs nanowires can be n-type doped with negligible loss of electron mobility. Molecular beam epitaxy was used to fabricate modulation-doped GaAs nanowires with Al0.33Ga0.67As shells that contained a layer of Si dopants. We identify the presence of the doped layer from a high-angle annular dark field scanning electron microscopy cross-section image. The doping density, carrier mobility, and charge carrier lifetimes of these n-type nanowires and nominally undoped reference samples were determined using the noncontact method of optical pump terahertz probe spectroscopy. An n-type extrinsic carrier concentration of 1.10 ± 0.06 × 10(16) cm(-3) was extracted, demonstrating the effectiveness of modulation doping in GaAs nanowires. The room-temperature electron mobility was also found to be high at 2200 ± 300 cm(2) V(-1) s(-1) and importantly minimal degradation was observed compared with undoped reference nanowires at similar electron densities. In addition, modulation doping significantly enhanced the room-temperature photoconductivity and photoluminescence lifetimes to 3.9 ± 0.3 and 2.4 ± 0.1 ns respectively, revealing that modulation doping can passivate interfacial trap states. |
| File Format | PDF HTM / HTML |
| DOI | 10.1021/nl504566t |
| PubMed reference number | 25602841 |
| Journal | Medline |
| Volume Number | 15 |
| Issue Number | 2 |
| Alternate Webpage(s) | https://ora.ouls.ox.ac.uk/objects/uuid:1fb48876-e8f6-4b1f-ba48-4f256fab0538/download_file?file_format=pdf&safe_filename=nl504566t.pdf&type_of_work=Journal+article |
| Alternate Webpage(s) | https://www.escholar.manchester.ac.uk/api/datastream?datastreamId=POST-PEER-REVIEW-PUBLISHERS.PDF&publicationPid=uk-ac-man-scw:253976 |
| Alternate Webpage(s) | https://www-herz.physics.ox.ac.uk/publications/Boland15a.pdf |
| Alternate Webpage(s) | https://doi.org/10.1021/nl504566t |
| Journal | Nano letters |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
