Systematic Surface Phase Transition of Ag Thin Films by Iodine Functionalization at Room Temperature: Evolution of Optoelectronic and Texture Properties

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autor(en): Bashouti MY, Talebi R, Kassar T, Nahal A, Ristein J, Unruh T, Christiansen SH
Zeitschrift: Scientific Reports
Verlag: NATURE PUBLISHING GROUP
Jahr der Veröffentlichung: 2016
Band: 6
ISSN: 2045-2322


Abstract


We show a simple room temperature surface functionalization approach using iodine vapour to control a surface phase transition from cubic silver (Ag) of thin films into wurtzite silver-iodid (beta-AgI) films. A combination of surface characterization techniques (optical, electronical and structural characterization) reveal distinct physical properties of the new surface phase. We discuss the AgI thin film formation dynamics and related transformation of physical properties by determining the work-function, dielectric constant and pyroelectric behavior together with morphological and structural thin film properties such as layer thickness, grain structure and texture formation. Notable results are: (i) a remarkable increase of the work-function (by 0.9 eV) of the Ag thin layer after short a iodine exposure time (<= 60 s), with simultaneous increase of the thin film transparency (by two orders of magnitude), (ii) pinning of the Fermi level at the valance band maximum upon iodine functionalization, (iii) 84% of all crystallites grain were aligned as a result of the evolution of an internal electric field. Realizing a nanoscale layer stack composed of a dielectric AgI layer on top of a metallic thin Ag layer with such a simple method has some technological implications e.g. to realize optical elements such as planar optical waveguides.



FAU-Autoren / FAU-Herausgeber

Kassar, Thaer
Professur für Nanomaterialcharakterisierung (Streumethoden)
Ristein, Jürgen apl. Prof. Dr.
Lehrstuhl für Laserphysik
Unruh, Tobias Prof. Dr.
Professur für Nanomaterialcharakterisierung (Streumethoden)


Zusätzliche Organisationseinheit(en)
Exzellenz-Cluster Engineering of Advanced Materials


Autor(en) der externen Einrichtung(en)
Max-Planck-Institut für die Physik des Lichts (MPL) / Max Planck Institute for the Science of Light
University of Tehran


Zitierweisen

APA:
Bashouti, M.Y., Talebi, R., Kassar, T., Nahal, A., Ristein, J., Unruh, T., & Christiansen, S.H. (2016). Systematic Surface Phase Transition of Ag Thin Films by Iodine Functionalization at Room Temperature: Evolution of Optoelectronic and Texture Properties. Scientific Reports, 6. https://dx.doi.org/10.1038/srep21439

MLA:
Bashouti, Muhammad Y., et al. "Systematic Surface Phase Transition of Ag Thin Films by Iodine Functionalization at Room Temperature: Evolution of Optoelectronic and Texture Properties." Scientific Reports 6 (2016).

BibTeX: 

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