Photoelectronic Properties of Ternary Niobium Oxides

Dwight, K.; Wold, A.

doi:10.1021/bk-1981-0146.ch013

Cited by 3 publications

(1 citation statement)

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“…α-Fe 2 O 3 , an n-type semiconductor, is another photoelectrode material for wet-type solar cells that has been studied for a long time. − α-Fe 2 O 3 has a relatively small band gap of ca. 2.2 eV and is photoelectrochemically stable in aqueous solutions.…”

Section: Introductionmentioning

confidence: 99%

Photoelectrochemical Properties of Fe₂O₃−Nb₂O₅ Films Prepared by Sol−Gel Method

Miyake

Kozuka

2005

J. Phys. Chem. B

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Fe2O3-Nb2O5 coating films of various Nb/(Fe + Nb) mole ratios were prepared on nesa silica glass substrates from Fe(NO3)3.9H2O - NbCl5 - CH3(CH2)2CH2OH - CH3COOH solutions by the sol-gel method. The photoanodic properties were studied in a three-electrode cell with an aqueous buffer solution of pH = 7 as the supporting electrolyte. The crystalline phases identified were alpha-Fe2O3 (Nb/(Fe + Nb) = 0), alpha-Fe2O3 + FeNbO4 (Nb/(Fe + Nb) = 0.25), FeNbO4 (Nb/(Fe + Nb) = 0.5), FeNbO4 + Nb2O5 (Nb/(Fe + Nb) = 0.75), and Nb2O5 (Nb/(Fe + Nb) = 1). When the Nb/(Fe + Nb) mole ratio increased from 0 to 0.25, the crystalline phases changed from alpha-Fe2O3 to alpha-Fe2O3 + FeNbO4, the photoanodic current under white light illumination increased, and the photoanodic current under monochromatized light illumination increased in both visible and ultraviolet regions. When the Nb/(Fe + Nb) ratio increased over 0.25, the crystalline phases changed to FeNbO4, FeNbO4 + Nb2O5, or Nb2O5, and the photoanodic current decreased. The sample consisting of alpha-Fe2O3 and FeNbO4 (Nb/(Fe + Nb) = 0.25) exhibited photoresponse extending to 600 nm and an IPCE of 18% at a wavelength of 325 nm.

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