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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.; Patanè, Amalia

Authors

Nilanthy Balakrishnan

Zakhar R. Kudrynskyi

Garry W. Mudd

Simon A. Svatek

Oleg Makarovsky

Zakhar D. Kovalyuk

Laurence Eaves

Peter H. Beton

Amalia Patanè



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.

Journal Article Type Article
Publication Date 2014-11
Journal Advanced Optical Materials
Electronic ISSN 2195-1071
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 2
Issue 11
Pages 1064-1069
APA6 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
DOI https://doi.org/10.1002/adom.201400202
Keywords Metal chalcogenides; Electroluminescence; van der Waals, Crystals; Homojunctions; Heterojunctions
Publisher URL http://onlinelibrary.wiley.com/doi/10.1002/adom.201400202/abstract;jsessionid=FB7C91F2B9DFAC16749672B820F55CCC.f04t02
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0





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