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Theoretically manipulating quantum dots on two-dimensional TiO2 monolayer for effective visible light absorption

Journal Article


Abstract


  • Low solar energy harvesting and conversion efficiency has become a major problem in solar energy science and engineering owing to the difficulty in capturing solar energy across the wide solar spectrum, especially in the visible light range. Inspired by the extraordinary properties of materials arising from decreased dimensions, in this study, we explore a nanocontact system formed by a two-dimensional (2D) TiO2 monolayer and II-VI semiconductor (CdX)13 (X = S, Se, and Te) nanocages for engineering the visible light absorption. The nanocontact system, via either Ti-X or Cd-O bond coupling mechanism, forms an ideal type II band alignment, where the stronger donor-acceptor coupling in the Ti-X contact system more efficiently relaxes the coupled geometry and helps it to couple to more electrons, therefore leading to an enhancement of the absorption peaks in the visible frequency range. On changing the element X in (CdX)13 from S to Se then Te, a red shift of the visible light absorption peaks accompanied by stimulating optical response of the whole nanocontact system was observed. Nanocontacting semiconductors comprising low-dimensional (CdX)13 nanocage@TiO2 monolayer systems, which promote charge separation and optical absorption in the visible range that arise from the effects of adsorbent nature, decreasing size, and efficient interfacial coupling mechanism, are therefore promising photovoltaic and photocatalytic materials.

Authors


  •   Liao, Ting (external author)
  •   Sun, Ziqi (external author)
  •   Dou, Shi Xue

Publication Date


  • 2017

Citation


  • Liao, T., Sun, Z. & Dou, S. Xue. (2017). Theoretically manipulating quantum dots on two-dimensional TiO2 monolayer for effective visible light absorption. ACS Applied Materials and Interfaces, 9 (9), 8255-8262.

Scopus Eid


  • 2-s2.0-85014812207

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2378

Has Global Citation Frequency


Number Of Pages


  • 7

Start Page


  • 8255

End Page


  • 8262

Volume


  • 9

Issue


  • 9

Place Of Publication


  • United States

Abstract


  • Low solar energy harvesting and conversion efficiency has become a major problem in solar energy science and engineering owing to the difficulty in capturing solar energy across the wide solar spectrum, especially in the visible light range. Inspired by the extraordinary properties of materials arising from decreased dimensions, in this study, we explore a nanocontact system formed by a two-dimensional (2D) TiO2 monolayer and II-VI semiconductor (CdX)13 (X = S, Se, and Te) nanocages for engineering the visible light absorption. The nanocontact system, via either Ti-X or Cd-O bond coupling mechanism, forms an ideal type II band alignment, where the stronger donor-acceptor coupling in the Ti-X contact system more efficiently relaxes the coupled geometry and helps it to couple to more electrons, therefore leading to an enhancement of the absorption peaks in the visible frequency range. On changing the element X in (CdX)13 from S to Se then Te, a red shift of the visible light absorption peaks accompanied by stimulating optical response of the whole nanocontact system was observed. Nanocontacting semiconductors comprising low-dimensional (CdX)13 nanocage@TiO2 monolayer systems, which promote charge separation and optical absorption in the visible range that arise from the effects of adsorbent nature, decreasing size, and efficient interfacial coupling mechanism, are therefore promising photovoltaic and photocatalytic materials.

Authors


  •   Liao, Ting (external author)
  •   Sun, Ziqi (external author)
  •   Dou, Shi Xue

Publication Date


  • 2017

Citation


  • Liao, T., Sun, Z. & Dou, S. Xue. (2017). Theoretically manipulating quantum dots on two-dimensional TiO2 monolayer for effective visible light absorption. ACS Applied Materials and Interfaces, 9 (9), 8255-8262.

Scopus Eid


  • 2-s2.0-85014812207

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2378

Has Global Citation Frequency


Number Of Pages


  • 7

Start Page


  • 8255

End Page


  • 8262

Volume


  • 9

Issue


  • 9

Place Of Publication


  • United States