Jump to main content
Jump to site search

Issue 48, 2016
Previous Article Next Article

Gradient doping – a case study with Ti-Fe2O3 towards an improved photoelectrochemical response

Author affiliations

Abstract

The present study investigates the effect of gradient doping on modifying the photoelectrochemical response of Ti-doped Fe2O3 photoanodes for their use in sunlight based water splitting for hydrogen evolution. The deposition of a thin film over the ITO (tin doped indium oxide) substrate was carried out using a spray pyrolysis method. The concentration of dopant was varied from 0.5–8.0 at% and two sets of samples were also prepared with low to high (0.5–8%) and high to low (8–0.5%) dopant concentrations in the direction towards the substrate. The prepared thin films were characterized using X-ray Diffractometry (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray (EDX) Spectroscopy, Secondary Ion Mass Spectroscopy (SIMS), X-ray Photoelectron Spectroscopy (XPS) and UV-visible Spectroscopy. The photoelectrochemical studies revealed that the deposition of dopant layers with a low to high concentration towards the substrate exhibited a highly improved photoresponse (200 times) in comparison to the pristine sample and a two fold enhancement in comparison to 2% Ti-doped Fe2O3. The improvement in the photoresponse has been attributed to the values of a high flat band potential, low resistance, high open circuit voltage, carrier separation efficiency, applied bias photon-to-current conversion efficiency (ABPE), and incident photon-to-current conversion efficiency (IPCE). A reduced charge transfer resistance has been demonstrated with Nyquist plots.

Graphical abstract: Gradient doping – a case study with Ti-Fe2O3 towards an improved photoelectrochemical response

Back to tab navigation

Publication details

The article was received on 09 Aug 2016, accepted on 04 Nov 2016 and first published on 07 Nov 2016


Article type: Paper
DOI: 10.1039/C6CP05515J
Citation: Phys. Chem. Chem. Phys., 2016,18, 32735-32743

  •   Request permissions

    Gradient doping – a case study with Ti-Fe2O3 towards an improved photoelectrochemical response

    A. Srivastav, A. Verma, A. Banerjee, S. A. Khan, M. Gupta, V. R. Satsangi, R. Shrivastav and S. Dass, Phys. Chem. Chem. Phys., 2016, 18, 32735
    DOI: 10.1039/C6CP05515J

Search articles by author

Spotlight

Advertisements