Charge Redistribution Mechanisms in SnSe2Surfaces Exposed to Oxidative and Humid Environments and Their Related Influence on Chemical Sensing
| Autor: | Amjad Al Taleb, Daniel Farías, Danil W. Boukhvalov, Valentina Paolucci, Francesca Genuzio, Carlo Cantalini, Tevfik Onur Menteş, Chin-Shan Lue, Gianluca D'Olimpio, Piero Torelli, Chia Nung Kuo, Andrea Locatelli, Antonio Politano |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
CHARGE TRANSFER
SEMICONDUCTING SELENIUM COMPOUNDS CHEMICAL INERTNESS Letter Materials science VAN DER WAALS FORCES Oxide chemistry.chemical_element 02 engineering and technology CHEMICAL SENSORS HETEROJUNCTIONS SEMICONDUCTING TIN COMPOUNDS 010402 general chemistry 01 natural sciences symbols.namesake chemistry.chemical_compound MOLECULES AMBIENT HUMIDITY Molecule CHEMICAL SENSING General Materials Science Work function Redistribution (chemistry) DENSITY FUNCTIONAL THEORY Physical and Theoretical Chemistry SELENIUM COMPOUNDS Humidity HUMIDITY SENSING Heterojunction 021001 nanoscience & nanotechnology SURFACE OXIDATIONS 0104 chemical sciences chemistry METAL CHALCOGENIDE 13. Climate action Chemical physics CHARGE REDISTRIBUTION symbols HUMIDITY SENSORS INORGANIC COMPOUNDS van der Waals force 0210 nano-technology Tin HUMID ENVIRONMENT |
| Zdroj: | Journal of Physical Chemistry Letters The Journal of Physical Chemistry Letters |
| DOI: | 10.1021/acs.jpclett.0c02616&partnerID=40&md5=61bb998ef9ec9e13c7e212299fd95797 |
| Popis: | 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 chemical sensors. Our findings also imply that recent reports on humidity sensing with SnSe2 should be reinterpreted, considering the pivotal role of the oxide skin in the interaction with water molecules. © PID2019-109525RB-I00; Horizon 2020 Framework Programme, H2020: 730872; Ministerio de Economía y Competitividad, MINECO: CEX2018-000805-M, E12H1800010001; Ministero dell’Istruzione, dell’Università e della Ricerca, MIUR; Ministry of Education and Science of the Russian Federation, Minobrnauka: FEUZ-2020-0060 This work has been partially supported by the Spanish Ministerio de Ciencia e Innovación under Project PID2019-109525RB-I00. D.F. acknowledges financial support from the Spanish Ministry of Economy and Competitiveness, through the “María de Maeztu” Programme for Units of Excellence in R&D (CEX2018-000805-M). D.F. and A.A.T. acknowledge the project CALIPSOplus under Grant Agreement 730872 from the EU Framework Programme for Research and Innovation HORIZON 2020. A.P. and G.D. acknowledge the CERIC–ERIC Consortium for the access to the Nanospectroscopy facility and financial support. G.D. acknowledges funding of a Ph.D. fellowship from PON Ricerca e Innovazione 2014–2020 (Project E12H1800010001) by the Italian Ministry of University and Research (MIUR). D.W.B. acknowledges the support by the Ministry of Science and Higher Education of the Russian Federation (through the basic part of the government mandate, Project No. FEUZ-2020-0060). |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|