Controllable Preparation and Photoelectrochemical Performance of TiO2 Thin Film with Different Morphology

Abstract

Abstract: Anatase TiO₂ thin films with different morphology were prepared on FTO substrates by hydrothermal method. With the increasing of hydrochloric acid concentration in the precursor, TiO₂ thin films gradually evolved from spherical particle films into TiO₂ nanosheet array films with a large percentage of high-energy exposed (001) planes. By analyzing the evolution rule of morphology and X-ray diffraction patterns, a reasonable growth and evolution mechanism of TiO₂ thin film with different morphology was proposed, and the role of hydrochloric acid was explained. In order to further improve the performance of TiO₂ thin films, CdS quantum dots (QDs) sensitization was performed on different TiO₂ thin films by the successive ionic layer adsorption and reaction method. The optical absorption performance and photoelectrochemical (PEC) properties of composite films were studied by ultraviolet visible absorption spectroscopy and three-electrode electrochemistry system. The optical absorption data and PEC performance data show that the properties of CdS/TiO₂ composite films are better than those of pure TiO₂ thin films, and the properties of nanosheet array films are obviously better than other morphologies, which illustrates the performance superiority of TiO₂ nanosheet array films with large area high-energy (001) planes exposed. The excellent PEC properties also suggest that the QDs sensitized TiO₂ nanosheet array films with a large percentage of high-energy surfaces have potential applications in PEC solar cells.

Key words: TiO₂ thin film, (001) lattice plane, crystal growth, hydrothermal method, quantum dot, sensitization

CLC Number:

WANG Xinwei, CHE Zhiyuan, ZHANG Xing, LI Lingwei, ZHANG Wei, SU Shi, MA Jinwen. Controllable Preparation and Photoelectrochemical Performance of TiO₂ Thin Film with Different Morphology[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2021, 50(3): 516-522.

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Controllable Preparation and Photoelectrochemical Performance of TiO₂ Thin Film with Different Morphology

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