Doped colloidal InAs nanocrystals in the single ionized dopant limit

Show simple item record Biaye, Moussa Amit, Yorai Gradkowski, Kamil Turek, Natalia Godey, Sylvie Makoudi, Younes Deresmes, Dominique Tadjine, Athmane Delerue, Christophe Banin, Uri Mélin, Thierry 2019-08-27T15:59:50Z 2019-08-27T15:59:50Z 2019-05-16
dc.identifier.citation Biaye, M., Amit, Y., Gradkowski, K., Turek, N., Godey, S., Makoudi, Y., Deresmes, D., Tadjine, A., Delerue, C., Banin, U. and Mélin, T. (2019) 'Doped Colloidal InAs Nanocrystals in the Single Ionized Dopant Limit', The Journal of Physical Chemistry C, 123 (23), pp. 14803-14812. doi: 10.1021/acs.jpcc.9b02576 en
dc.identifier.volume 123 en
dc.identifier.issued 23 en
dc.identifier.startpage 14803 en
dc.identifier.endpage 14812 en
dc.identifier.issn 1932-7447
dc.identifier.doi 10.1021/acs.jpcc.9b02576 en
dc.description.abstract We investigate the electronic properties of individual n-type (Cu) doped and p-type (Ag) doped InAs colloidal nanocrystals (NCs) in the 2–8 nm size range from their charge transfers toward a highly oriented pyrolytic graphite (HOPG) substrate, using ultrahigh vacuum Kelvin probe force microscopy (KPFM) with elementary charge sensitivity at 300 K. The NC active dopant concentration is measured as ND = 8 × 1020 cm–3 and NA > 5 × 1020 cm–3 for n- and p-type doping, respectively. The electrostatic equilibrium between the NC and the HOPG reference substrate is investigated and reveals an enhancement of the Fermi-level mismatch between the NCs and the HOPG substrate at reduced NC sizes, both for n- and p-type doping. It also shows, for n-type doped NCs with smallest sizes (∼2 nm), the existence of a full depletion regime, in which smallest NCs contain single ionized dopants. Results are compared with self-consistent tight-binding calculations of the electronic structure of InAs NCs, including hydrogenoid impurities and the presence of a host substrate, in the case of n-type doped NCs. The observed enhancement of the NC–HOPG Fermi-level mismatch can be understood by considering a size-dependent electrostatic contribution attributed to dipolar effects at the NC–ligand interface. The estimated surface dipole density equals a few Debye/nm2 and is increased at smallest NC sizes, which follows the enhancement of ligand densities at small NC sizes previously reported for metallic or semiconducting NCs. The results put forward the role played by the NC–ligand interface electrostatics for electronic applications. en
dc.description.sponsorship Agence Nationale de la Recherche (contracts ANR-11-BS10-000, ANR-15-CE09-0004-04, and ANR-13-BS09-0020) en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher American Chemical Society, ACS en
dc.rights © 2019 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in The Journal of Physical Chemistry C, © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see en
dc.subject Charge transfer en
dc.subject Colloids en
dc.subject Electronic properties en
dc.subject Electronic structure en
dc.subject Electrostatics en
dc.subject Fermi level en
dc.subject III-V semiconductors en
dc.subject Indium arsenide en
dc.subject Ionization en
dc.subject Ligands en
dc.subject Nanocrystals en
dc.subject Substrates en
dc.title Doped colloidal InAs nanocrystals in the single ionized dopant limit en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother Kamil Gradkowsk, Tyndall National Institute, University College Cork, Cork, Ireland. +353-21-490-3000 Email: en
dc.internal.availability Full text available en Access to this article is restricted until 12 months after publication by request of the publisher. en 2020-05-16
dc.description.version Accepted Version en
dc.contributor.funder Agence Nationale de la Recherche en
dc.description.status Peer reviewed en
dc.identifier.journaltitle The Journal of Physical Chemistry C en
dc.internal.IRISemailaddress en
dc.identifier.eissn 1932-7455

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