Room Temperature Electroluminescence from Mechanically Formed van der Waals III-VI Homojunctions and Heterojunctions

Balakrishnan, Nilanthy; Kudrynskyi, Zakhar R.; Fay, Mike W.; Mudd, Garry W.; Svatek, Simon A.; Makarovsky, Oleg; Kovalyuk, Zakhar D.; Eaves, Laurence; Beton, Peter H.

doi:10.1002/adom.201400202

Authors

Nilanthy Balakrishnan

ZAKHAR KUDRYNSKYI ZAKHAR.KUDRYNSKYI@NOTTINGHAM.AC.UK
Research Fellow

Dr MICHAEL FAY MICHAEL.FAY@NOTTINGHAM.AC.UK
Senior Research Fellow

Garry W. Mudd

Simon A. Svatek

OLEG MAKAROVSKIY Oleg.Makarovsky@nottingham.ac.uk
Associate Professor

Zakhar D. Kovalyuk

LAURENCE EAVES laurence.eaves@nottingham.ac.uk
Research Professor

PETER BETON peter.beton@nottingham.ac.uk
Professor of Physics

AMALIA PATANE amalia.patane@nottingham.ac.uk
Professor of Physics

Abstract

Room temperature electroluminescence from semiconductor junctions is demonstrated. The junctions are fabricated by the exfoliation and direct mechanical adhesion of InSe and GaSe van der Waals layered crystals. Homojunction diodes formed from layers of p- and n-type InSe exhibit electroluminescence at energies close to the bandgap energy of InSe (Eg= 1.26 eV). In contrast, heterojunction diodes formed by combining layers of p-type GaSe and n-type InSe emit photons at lower energies, which is attributed to the generation of spatially indirect excitons and a staggered valence band lineup for the holes at the GaSe/InSe interface. These results demonstrate the technological potential of mechanically formed heterojunctions and homojunctions of direct-bandgap layered GaSe and InSe compounds with an optical response over an extended wavelength range, from the near-infrared to the visible spectrum.

Citation

Balakrishnan, N., Kudrynskyi, Z. R., Fay, M. W., Mudd, G. W., Svatek, S. A., Makarovsky, O., …Patanè, A. (2014). Room Temperature Electroluminescence from Mechanically Formed van der Waals III-VI Homojunctions and Heterojunctions. Advanced Optical Materials, 2(11), 1064-1069. https://doi.org/10.1002/adom.201400202

Journal Article Type	Article
Acceptance Date	Aug 20, 2014
Online Publication Date	Aug 20, 2014
Publication Date	2014-11
Deposit Date	Feb 16, 2016
Publicly Available Date	Feb 16, 2016
Journal	Advanced Optical Materials
Electronic ISSN	2195-1071
Publisher	Wiley
Peer Reviewed	Peer Reviewed
Volume	2
Issue	11
Pages	1064-1069
DOI	https://doi.org/10.1002/adom.201400202
Keywords	Metal chalcogenides; Electroluminescence; van der Waals, Crystals; Homojunctions; Heterojunctions
Public URL	https://nottingham-repository.worktribe.com/output/993844
Publisher URL	http://onlinelibrary.wiley.com/doi/10.1002/adom.201400202/abstract;jsessionid=FB7C91F2B9DFAC16749672B820F55CCC.f04t02