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Author: search.filters.author.Choopun, SupabSubject: search.filters.subject.Nanocrystal

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    Copper incorporation in Mn2+-doped Sn2S3 nanocrystals and the resultant structural, optical, and electrochemical characteristics
    (2018-08-15)
    Noppakuadrittidej, Prae
    ;
    Vailikhit, Veeramol
    ;
    Teesetsopon, Pichanan
    ;
    Choopun, Supab
    ;
    Tubtimtae, Auttasit
    Sn<inf>2</inf>S<inf>3</inf> nanocrystals (NCs) with both Mn<sup>2+</sup> doping and Cu<sup>2+</sup> incorporation were synthesized using a chemical bath deposition method. The Cu<sup>2+</sup> ions formed an anorthic Mn<sup>2+</sup>-doped Cu<inf>2</inf>SnS<inf>3</inf> structure with E<inf>g</inf> = 1.44 eV, which altered the material's optical and photo/electrochemical properties. After coating the bare Nb<inf>2</inf>O<inf>5</inf> electrode with Mn<sup>2+</sup>-doped Sn<inf>2</inf>S<inf>3</inf> or Mn<sup>2+</sup>-doped Cu<inf>2</inf>SnS<inf>3</inf> NCs, the photoluminescence spectrum was blue-shifted to 411.13 nm from 411.69 nm. Compared to the sample without Cu<sup>2+</sup>, the Cu<sup>2+</sup>-incorporated sample showed a slightly stronger emission at the same position, possibly due to disorder in the crystalline structure based on variations at the interface of Mn<sup>2+</sup>-doped Cu<inf>2</inf>SnS<inf>3</inf> NCs. Electrochemical analysis showed a lower charge transfer resistance in the Mn<sup>2+</sup>-doped Cu<inf>2</inf>SnS<inf>3</inf>, which is related to its larger electroactive surface area. The larger electroactive surface area is attributed to the Faradaic redox processes at the electrode surface, which suppresses the carrier recombination. The coexistence of Cu<sup>2+</sup> and Mn<sup>2+</sup> ions shortened the electron transport pathway at the interface and improved the carrier diffusion coefficient and diffusion length, leading to a higher specific capacitance that implies higher energy storage performance. Finally, the I-V characteristics of the Mn<sup>2+</sup>-doped Cu<inf>2</inf>SnS<inf>3</inf>-coated Nb<inf>2</inf>O<inf>5</inf> electrode under various light illumination conditions indicated its better efficiency in photoresponse, electron generation, and charge collection, owing to a superior charge transport mechanism. Detailed results were obtained about the charge dynamics in the as-prepared photo/electrochemical devices with Cu<sup>2+</sup> incorporation in the Mn<sup>2+</sup>-doped SnS<inf>3</inf> electrode.