| Zugriffsnummer | 36732 |
| Dokumenttyp | Zeitschriftenartikel |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | Sacrificial self-assembled monolayers for the passivation of GaAs (100) surfaces and interfaces |
| Autor(in); Institution |
Cuypers, D.; imec, Leuven, BELGIUM; KU Leuven, Department Chemie, Leuven, BELGIUM
Fleischmann, C.; imec, Leuven, BELGIUM
van Dorp, D.H.; Imec, BELGIUM
Brizzi, S.; Brandenburgische TU, Cottbus, GERMANY
Tallarida, M.; Brandenburgische TU, Cottbus, GERMANY
Müller, Matthias; 7.2, Kryophysik und Spektrometrie, PTB-Berlin
Hönicke, Philipp; 7.2, Kryophysik und Spektrometrie, PTB-Berlin
Billen, A.; KU Leuven, Department Chemie, Leuven, BELGIUM
Chintala, R.; imec, Leuven, BELGIUM; KU Leuven, Department Natuurkunde en Sterrenkunde, Leuven, BELGIUM
Conard, T.; imec, Leuven, BELGIUM
Schmeißer, D.; Brandenburgische TU, Cottbus, GERMANY
Vandervorst, W.; imec, Leuven, BELGIUM; KU Leuven, Department Natuurkunde en Sterrenkunde, Leuven, BELGIUM
Van Elshocht, S.; imec, Leuven, BELGIUM
Armini, S.; imec, Leuven, BELGIUM
De Gendt, S.; imec, Leuven, BELGIUM
Adelmann, C.; imec, Leuven, BELGIUM
|
| Quelle/Jahr | Chemistry of Materials: 28 (2016), 5689 - 5701 |
| ISSN | 0897-4756 (PRINT) ; 1520-5002 (ONLINE) |
| DOI | |
| Verlag | Washington, DC: American Chemical Society (ACS) |
| Zusammenfassung | The use of sacrificial self-assembled monolayers (SAMs) to prepare clean n-type GaAs (100) surfaces without band bending in vacuo is demonstrated. GaAs surface passivation using octadecanethiol SAMs after HCl cleaning is shown to lead to an enhancement of the room-temperature photoluminescence intensity. Synchrotron-radiation photoelectron spectroscopy (SRPES) finds that the interfacial oxide between GaAs and the SAM remains below the detection limit. Evidence for both Ga−S and As−S bonds at the GaAs−thiolate interface is found. The limited thermal stability of the SAM allows the desorption of the alkyl chains by in situ thermal annealing at temperatures above 180 °C, leaving S bonded to Ga behind. The resulting surface contains only a very small amount of O (0.05 ML coverage) and C (about 3% of the SAM remaining) and shows no band bending with the surface Fermi level close to the conduction band. Atomic layer deposition of Al2O3 on this surface occurs via the formation of Al−S bonds without introducing any additional band bending. This indicates that the surface preparation of ntype GaAs (100) using sacrificial octadecanethiol SAMs followed by in situ thermal removal provides a route toward GaAs/oxide interfaces without interfacial oxides and without band bending. |
Zitierung
Cuypers, D., Fleischmann, C., van Dorp, D., Brizzi, S., Tallarida, M., Müller, M., Hönicke, P., Billen, A., Chintala, R., Conard, T., Schmeißer, D., Vandervorst, W., Van Elshocht, S., Armini, S., De Gendt, S., & Adelmann, C. (2016). Sacrificial self-assembled monolayers for the passivation of GaAs (100) surfaces and interfaces. Chemistry of Materials, 28, 5689–5701. https://doi.org/10.1021/acs.chemmater.6b01732