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Issue 4, 2018
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Charge separation properties of Ta3N5 photoanodes synthesized via a simple metal–organic-precursor decomposition process

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Abstract

Here, we successfully synthesized a Ta3N5 thin film using a simple metal–organic-precursor decomposition process followed by its conversion to nitride and studied its photoelectrochemical (PEC) properties to understand charge separation on the surface. Newly synthesized Ta3N5 photoanodes showed a significant difference in the PEC activity in relation to the annealing temperature under ammonia flow, although similar light absorption properties or electronic states were obtained. Charge separation related PEC properties were analyzed using intensity modulated photocurrent density spectroscopy (IMPS) and photocurrent measurements in the absence/presence of scavengers. The charge transfer and recombination rate constants which are related to the photogenerated charge-separation dynamics on the Ta3N5 surface were found to be more sensitively influenced by the ammonia annealing temperatures, and low temperature (700 °C) treated Ta3N5 showed a fast recombination rate constant (kr). In addition, high-efficiency charge injection into the electrolyte on the surface was critically associated with the greatly enhanced photocurrent density of Ta3N5 synthesized at a higher temperature (900 °C) of ammonia annealing.

Graphical abstract: Charge separation properties of Ta3N5 photoanodes synthesized via a simple metal–organic-precursor decomposition process

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Publication details

The article was received on 09 Aug 2017, accepted on 21 Dec 2017 and first published on 21 Dec 2017


Article type: Paper
DOI: 10.1039/C7CP05406H
Citation: Phys. Chem. Chem. Phys., 2018,20, 2865-2871
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    Charge separation properties of Ta3N5 photoanodes synthesized via a simple metal–organic-precursor decomposition process

    S. G. Han, S. Y. Chae, S. Y. Lee, B. K. Min and Y. J. Hwang, Phys. Chem. Chem. Phys., 2018, 20, 2865
    DOI: 10.1039/C7CP05406H

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