Author: Ingler, William B.; Baltrus, John P.; Khan, Shahed U. M.
Description: Stable zinc-doped iron(III) oxide thin films that exhibit p-type behavior were synthesized by spray pyrolytic deposition (SPD) on conducting indium-doped tin oxide-coated glass substrate. The highest photocurrent density of 1.1 mA/cm2 was observed at an illumination intensity of 40 mW/cm2 at -0.8 V vs Pt for zinc-doped p-Fe2O3 samples prepared at an optimum substrate temperature of 663 K using an optimum spray time of 70 s. A quantum efficiency of 21.1% at 325 nm was found for SPD samples prepared using a dopant concentration of 0.0088 M zinc nitrate hexahydrate. X-ray diffraction results showed structures of alpha-Fe2O3 and ZnFe2O4. A direct band gap energy of 2.2 eV was found from monochromatic photocurrent density data and agrees closely with the band gap obtained from UV-vis absorption. The X-ray photoelectron spectroscopy results also confirm the presence of zinc dopant (4.0 atomic %) in thin films of zinc-doped p-Fe2O3.
Subject headings: Zinc-doped iron(III) oxide thin films; SPD; Photoresponse
Publication year: 2004
Journal or book title: Journal of the American Chemical Society
Volume: 126
Issue: 33
Pages: 10238-10239
Find the full text: https://pubs.acs.org/doi/abs/10.1021/ja048461y
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Serial number: 3322