Hierarchical growth of SnO2 nanostructured films on FTO substrates : Structural defects induced by Sn(ii) self-doping and their effects on optical and photoelectrochemical properties

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Hongkang Wang
  • Sergii Kalytchuk
  • Haihua Yang
  • Lifang He
  • Chenyan Hu

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)6084-6091
Journal / PublicationNanoscale
Volume6
Issue number11
Online published30 Apr 2014
Publication statusPublished - 7 Jun 2014

Abstract

Direct hydrothermal growth of Sn(ii)-doped SnO2 films on fluorine-doped tin oxide (FTO) substrates results in the formation of upstanding SnO2 nanosheet arrays covered by hierarchical SnO2 nanoflowers. The n-type semiconductor films show extended photoresponse in the visible spectrum arising from the coexistence of Sn(ii) dopant ions and oxygen vacancies in these hierarchical SnO2 nanostructures, which leads to a narrowed bandgap. Photoluminescence spectroscopy revealed that the emission in the UV, blue and red spectral ranges is related to the evolution of Sn(ii) dopants and oxygen vacancies with annealing temperature, whereas oxygen vacancies are mostly responsible for visible emission. The Sn(ii)-doped SnO 2 films show higher photocurrent when sensitized with narrow bandgap CdS nanoparticles, serving as efficient electron acceptors. © 2014 the Partner Organisations.

Citation Format(s)

Hierarchical growth of SnO2 nanostructured films on FTO substrates : Structural defects induced by Sn(ii) self-doping and their effects on optical and photoelectrochemical properties. / Wang, Hongkang; Kalytchuk, Sergii; Yang, Haihua; He, Lifang; Hu, Chenyan; Teoh, Wey Yang; Rogach, Andrey L.

In: Nanoscale, Vol. 6, No. 11, 07.06.2014, p. 6084-6091.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review