Balakrishnan, N, Kudrynskyi, ZR, Fay, MW, Mudd, GW, Svatek, SA, Makarovsky, O, Kovalyuk, ZD, Eaves, L, Beton, PH and Patanè, A (2014) Room Temperature Electroluminescence from Mechanically Formed van der Waals III-VI Homojunctions and Heterojunctions. Advanced Optical Materials, 2 (11). 1064 - 1069. ISSN 2195-1071

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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.

Item Type: Article
Additional Information: This is the final published version of the article (version of record). It first appeared online via Wiley at - please refer to any applicable terms of use of the publisher.
Subjects: Q Science > QC Physics
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
Depositing User: Symplectic
Date Deposited: 14 Nov 2019 16:23
Last Modified: 14 Nov 2019 16:23

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