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Tin diselenide (SnSe2) is a van der Waals semiconductor, which spontaneously forms a subnanometric SnO2 skin once exposed to air. Here, by means of surface-science spectroscopies and density functional theory, we have investigated the charge redistribution at the SnO2–SnSe2 heterojunction in both oxidative and humid environments. Explicitly, we find that the work function of the pristine SnSe2 surface increases by 0.23 and 0.40 eV upon exposure to O2 and air, respectively, with a charge transfer reaching 0.56 e–/SnO2 between the underlying SnSe2 and the SnO2 skin. Remarkably, both pristine SnSe2 and defective SnSe2 display chemical inertness toward water, in contrast to other metal chalcogenides. Conversely, the SnO2–SnSe2 interface formed upon surface oxidation is highly reactive toward water, with subsequent implications for SnSe2-based devices working in ambient humidity, including …
American Chemical Society
Publication date: 
9 Oct 2020

Gianluca D’Olimpio, Francesca Genuzio, Tevfik Onur Menteş, Valentina Paolucci, Chia-Nung Kuo, Amjad Al Taleb, Chin Shan Lue, Piero Torelli, Daniel Farías, Andrea Locatelli, Danil W Boukhvalov, Carlo Cantalini, Antonio Politano

Biblio References: 
Volume: 11 Issue: 21 Pages: 9003-9011
The Journal of Physical Chemistry Letters