Voltammetric study of selenium and two-stage electrodeposition of photoelectrochemically active zinc selenide semiconductor films in Ionic liquid zinc chloride-1-ethyl-3-methylimidazolium chloride

Chi Pai, Chung Jui Su, Yi Ting Hsieh, Po Yu Chen, I. Wen Suna

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5 Citations (Scopus)

Abstract

Ionic liquid zinc chloride-1-ethyl-3-methylimidazolium chloride (IL ZnCl2-EMICl) with a ZnCl2/EMICl ratio of 40/60 mol% was used as the electrolyte to study the voltammetric behavior of Se(IV) introduced into the IL as selenium chloride (SeCl4) or selenium oxide (SeO2). The electrodeposition of ZnSe was performed using constant-potential electrolysis at tungsten electrodes via a two-stage approach from the IL with and without SeO2. The nucleation mechanism of Se at the tungsten electrodes agrees better with the three-dimensional instantaneous nucleation than the progressive nucleation based on Sharifker's model. Crystalline Se and approximately stoichiometric crystalline ZnSe electrodeposits could be obtained from this system. The ZnSe films showed photoelectrochemical activity with a bandgap energy of ∼2.5 eV. According to the experiments of the dependence of the photocurrent on the applied potential, the ZnSe film was determined to be a p-type semiconductor with the flatband potential VFB of.0.024 V (vs. Fc/Fc+).

Original languageEnglish
Pages (from-to)D243-D249
JournalJournal of the Electrochemical Society
Volume162
Issue number7
DOIs
Publication statusPublished - 2015 Jan 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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