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Validation of a Terminally Amino Functionalized Tetra‐Alkyl Sn(IV) Precursor in Metal–Organic Chemical Vapor Deposition of SnO 2 Thin Films: Study of Film Growth Characteristics, Optical, and Electrical Properties
Author(s) -
Zanders David,
Ciftyurek Engin,
Hoppe Christian,
de los Arcos Teresa,
Kostka Aleksander,
Rogalla Detlef,
Grundmeier Guido,
Schierbaum Klaus Dieter,
Devi Anjana
Publication year - 2019
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201801540
Subject(s) - metalorganic vapour phase epitaxy , materials science , thin film , chemical vapor deposition , x ray photoelectron spectroscopy , tin , alkyl , tin oxide , combustion chemical vapor deposition , van der pauw method , oxide , chemical engineering , inorganic chemistry , analytical chemistry (journal) , carbon film , nanotechnology , layer (electronics) , electrical resistivity and conductivity , organic chemistry , epitaxy , chemistry , metallurgy , hall effect , electrical engineering , engineering
Tin(IV) oxide is a promising semiconductor material with leading‐edge properties toward chemical sensing and other applications. For the growth of its thin films, metal–organic chemical vapor deposition (MOCVD) routes are advantageous due to their excellent scalability and potential to tune processing temperatures by careful choice of the reactants. Herein, a new and highly efficient MOCVD process for the deposition of tin(IV) oxide thin films employing a terminally amino alkyl substituted tin(IV) tetra‐alkyl compound is reported for the first time. The liquid precursor, tetrakis‐[3‐( N , N ‐dimethylamino)propyl] tin(IV), [Sn(DMP) 4 ], is thermally characterized in terms of stability and vapor pressure, yielding highly pure, polycrystalline tin(IV) oxide thin films with tunable structural and morphological features in the presence of oxygen. Detailed X‐ray photoelectron spectroscopy (XPS) analysis reveals the presence of oxygen vacancies and high amounts of chemisorbed oxygen species. Based on these promising features, the MOCVD process is optimized toward downscaling the thickness of tin(IV) oxide films from 25 to 50 nm to study the impact of incipient surface morphological changes occurring after initial thin‐film formation on the electrical properties as investigated by van der Pauw (vdP) resistivity measurements. Optical bandgaps of thin films with varying thicknesses are estimated using ultraviolet–visible (UV–vis) spectroscopy.