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Photoelectrochemical and photoresponsive properties of Bi2S3 nanotube and nanoparticle thin films

journal contribution
posted on 04.09.2014 by Asif A. Tahir, Muhammad A. Ehsan, Muhammad Mazhar, Upul Wijayantha-Kahagala-Gamage, Matthias Zeller, A.D. Hunter
Bi2S3 nanotubes and nanoparticle in the form of thin films were deposited on fluorine doped SnO2 (FTO) coated conducting glass substrates by Aerosol Assisted Chemical Vapor Deposition (AACVD) using tris-(N,N-diethyldithiocarbamato)bismuth(III), [Bi(S2CN(C2H5)2)3]2 (1) as a precursor. Thin films were deposited from solutions of (1) in either chloroform, dichloromethane, or a 1:1 mixture of chloroform and toluene at temperature between 350 to 450 °C and characterized by X-ray diffraction (XRD), UV−vis spectroscopy, field emission gun scanning electron microscopy (FEGSEM), and energy dispersive X-ray (EDX) analysis. FEGSEM images of films deposited from chloroform or dichloromethane exhibit well-defined and evenly distributed nanotubes with an average internal diameter of 40 nm. Films deposited from chloroform/toluene, on the other hand, have compact nanostuctured morphology. Bandgaps of 1.85 and 1.8 eV were estimated for nanotubes and nanoparticles, respectively, by extrapolating the linear part of the Tauc plot recorded for the films. The n-type Bi2S3 thin films display a reasonable photoactivity under illumination and are thus promising candidates for photoelectrochemical applications. The photoelectrochemical characteristics recorded under AM 1.5 illumination indicated photocurrent density of 1.9 mA/cm2 and 1.0 mA/cm2 at 0.23 V versus Ag/AgCl/3 M KCl for the films deposited from chloroform and chloroform/toluene, respectively. The photocurrent is among the highest reported for any Bi2S3 photoelectrode to date. Repeated illumination cycles show that the Bi2S3 thin films display a reasonable photosensitivity and response indicating their potential to be used in photodetector and optoelectronic nanodevice applications.

Funding

KGUW, MM, AAT and MAE acknowledge the British Research Council and the Pakistan Science Foundation (PSF) for research co-operation grants (Loughborough University – Quaid-i-Azam University) through the “Prime Minister’s Initiative for International Education 2 (PMI2)” scheme. The Smart Apex diffractometer was funded by NSF grant 0087210, by Ohio Board of Regents grant CAP-491, and by YSU. This work is also partly funded by EPSRC [grant number: EP/F057342/1].

History

School

  • Science

Department

  • Chemistry

Published in

CHEMISTRY OF MATERIALS

Volume

22

Issue

17

Pages

5084 - 5092 (9)

Citation

TAHIR, A.A. ... et al., 2010. Photoelectrochemical and photoresponsive properties of Bi2S3 nanotube and nanoparticle thin films. Chemistry of Materials, 22 (17), pp. 5084 - 5092.

Publisher

© American Chemical Society

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2010

Notes

Closed access. This article was published in the journal, Chemistry of Materials [© American Chemical Society] and the definitive version is available at: http://dx.doi.org/10.1021/cm101642b

ISSN

0897-4756

Language

en

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