Surface and Interface Chemistry in Colloidal Quantum Dots for Solar Applications Studied by X-Ray Photoelectron Spectroscopy.

Autor: Clark PCJ; School of Physics and Astronomy and the Photon Science Institute, The University of Manchester, Manchester, M13 9PL, UK.; Present address: Institute for Solar Fuels, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Hahn-Meitner Platz 1, D-14109 Berlin, Germany., Flavell WR; School of Physics and Astronomy and the Photon Science Institute, The University of Manchester, Manchester, M13 9PL, UK.
Jazyk: angličtina
Zdroj: Chemical record (New York, N.Y.) [Chem Rec] 2019 Jul; Vol. 19 (7), pp. 1233-1243. Date of Electronic Publication: 2018 Nov 02.
DOI: 10.1002/tcr.201800085
Abstrakt: Control of the surface and interface chemistry of colloidal quantum dots (CQDs) is critical to achieving a product with good air stability and high performing optoelectronic devices. Through various surface passivation treatments, vast improvements have been made in fields such as CQD photovoltaics; however devices have not currently reached commercial standards. We show how X-ray photoelectron spectroscopy (XPS) can provide a better understanding of exactly how surface treatments act on CQD surfaces, and the effect of surface composition on air stability and device performance.. We illustrate this with PbS-based CQDs, using XPS to measure oxidation processes, and to quantify the composition of the topmost surface layer after different surface treatments. We also demonstrate the use of synchrotron radiation-excited depth-profiling XPS, a powerful technique for determining the surface composition, chemistry and structure of CQDs. This review describes our recent progress in characterization of CQD surfaces using SR-excited depth profiling XPS and other photoemission techniques.
(© 2019 The Chemical Society of Japan & Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.)
Databáze: MEDLINE
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