Ternary Ag-In-S polycrystalline films deposited using chemical bath deposition for photoelectrochemical applications

Wen Sheng Chang, Ching Chen Wu, Ming Shan Jeng, Kong Wei Cheng, Chao Ming Huang, Tai Chou Lee

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41 Scopus citations

Abstract

This paper describes the preparation and characterization of ternary Ag-In-S thin films deposited on indium tin oxide (ITO)-coated glass substrates using chemical bath deposition (CBD). The composition of the thin films was varied by changing the concentration ratio of [Ag]/[In] in the precursor solutions. The crystal structure, optical properties, and surface morphology of the thin films were analyzed by grazing incidence X-ray diffraction (GIXRD), UV-vis spectroscopy, and field-emission scanning electron microscopy (FE-SEM). GIXRD results indicate that the samples consisted of AgInS2 and/or AgIn5S8 crystal phases, depending on the composition of the precursor solutions. The film thicknesses, electrical resistivity, flat band potentials, and band gaps of the samples were between 1.12 and 1.37 μm, 3.73 × 10-3 and 4.98 × 104 Ω cm, -0.67 and -0.90 V vs. NHE, and 1.83 and 1.92 eV, respectively. The highest photocurrent density was observed in the sample with [Ag]/[In] = 4. A photocurrent density of 9.7 mA cm-2 was obtained with an applied potential of 0.25 V vs. SCE in the three-electrode system. The photoresponse experiments were conducted in 0.25 M K2SO3 and 0.35 M Na2S aqueous electrolyte solutions under irradiation by a 300 W Xe light (100 mW cm-2). The results show that ternary Ag-In-S thin film electrodes have potential in water splitting applications.

Original languageEnglish
Pages (from-to)307-312
Number of pages6
JournalMaterials Chemistry and Physics
Volume120
Issue number2-3
DOIs
StatePublished - 15 Apr 2010

Keywords

  • Chemical synthesis
  • Electrochemical techniques
  • Optical properties
  • Thin films

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