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

Sung Gyu Han, Sang Youn Chae, Si Young Lee, Byoung Koun Min, Yun Jeong Hwang

Research output: Contribution to journalArticle

1 Citation (Scopus)

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.

Original languageEnglish
Pages (from-to)2865-2871
Number of pages7
JournalPhysical Chemistry Chemical Physics
Volume20
Issue number4
DOIs
Publication statusPublished - 2018 Jan 1

Fingerprint

polarization (charge separation)
photocurrents
ammonia
Metals
Photocurrents
Ammonia
Decomposition
decomposition
Temperature
annealing
Annealing
charge efficiency
metals
Genetic Recombination
Rate constants
electromagnetic absorption
Charge injection
nitrides
Electronic states
charge transfer

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Charge separation properties of Ta3N5 photoanodes synthesized via a simple metal-organic-precursor decomposition process. / Han, Sung Gyu; Chae, Sang Youn; Lee, Si Young; Min, Byoung Koun; Hwang, Yun Jeong.

In: Physical Chemistry Chemical Physics, Vol. 20, No. 4, 01.01.2018, p. 2865-2871.

Research output: Contribution to journalArticle

Han, Sung Gyu ; Chae, Sang Youn ; Lee, Si Young ; Min, Byoung Koun ; Hwang, Yun Jeong. / Charge separation properties of Ta3N5 photoanodes synthesized via a simple metal-organic-precursor decomposition process. In: Physical Chemistry Chemical Physics. 2018 ; Vol. 20, No. 4. pp. 2865-2871.
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