Effect of growth time on morphology and photoelectrochemical performance of TiO<sub>2</sub> nanorod arrays grown on transparent conducting substrates

Mei-rong Sui; Cui-ping Han; Xiu-quan Gu; Yong Wang; Lu Tang; Hui Tang

doi:10.1007/s11801-015-5170-3

Optoelectronics Letters ›› , Vol. 11 ›› Issue (6) : 405-409. DOI: 10.1007/s11801-015-5170-3

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Effect of growth time on morphology and photoelectrochemical performance of TiO₂ nanorod arrays grown on transparent conducting substrates

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Abstract

TiO₂ nanorod arrays (NRAs) were synthesized directly on the fluorine tin oxide (FTO) coated glass substrates by a facile hydrothermal route. The effects of growth time on the photoelectrochemical (PEC) properties of TiO₂ NRAs are investigated. The samples synthesized for 4 h exhibit a photocurrent intensity of 0.37 mA/cm² at the irradiation of Xe lamp and a bias of 0 V. As the growth time increases, the thickness and order degree of the NRAs are enhanced, but the photocurrent is reduced a lot. It might be associated with the hindering of a high background electron density in NRs due to the long-time hydrothermal reaction in acid environment. Moreover, the decline behavior is observed, which is attributed to the poor charge separation capacity of TiO₂ array electrodes and could be suppressed efficiently by applying a suitable positive bias.

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Mei-rong Sui, Cui-ping Han, Xiu-quan Gu, Yong Wang, Lu Tang, Hui Tang. Effect of growth time on morphology and photoelectrochemical performance of TiO₂ nanorod arrays grown on transparent conducting substrates. Optoelectronics Letters, , 11(6): 405‒409 https://doi.org/10.1007/s11801-015-5170-3

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This work has been supported by the Natural Science Foundation of Xuzhou City (No.KC14SM088), and the Natural Science Foundation Project of Jiangsu Province (No.BK20130198).