Influence of annealing temperature on performance of dye-sensitized TiO2 nanorod solar cells

Gu, Xiuquan; Zhao, Yun; Ye, Qiang

doi:10.1007/s10854-011-0601-9

Cited by 18 publications

(9 citation statements)

References 28 publications

(37 reference statements)

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“…By increasing the annealing temperature from 200 to 500 °C, the photocurrent was continuously improved from 0.03 mA/cm 2 to a maximum of 1.38 mA/cm 2 , as displayed in Figure S2b. Further increase of the annealing temperature to 600 °C can lead to a decrease in photocurrent density, which is due to the increase of electrical resistance of the FTO conducting layer . Therefore, the photoelectrochemical properties of TiO 2 NRAs grown for 4 h and annealed at 500 °C for 1 h are investigated in detail in the following part.…”

Section: Results and Discussionmentioning

confidence: 99%

Role of Cl Ion Desorption in Photocurrent Enhancement of the Annealed Rutile Single-Crystalline TiO₂ Nanorod Arrays

Huang

Bian

2017

J. Phys. Chem. C

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TiO 2 nanorods arrays (NRAs) have been considered as very promising photoanode materials in photoelectrochemical (PEC) cells. However, the performance of TiO 2 NRAs still requires substantial improvement in order to reach the goal of practical applications. Annealing treatment of TiO 2 NRAs can help to improve the PEC performance, but the mechanism is still not yet fully understood. In this work, we systematically investigated the optical and electronic properties, as well as the PEC performance of the thermally treated rutile singlecrystalline TiO 2 NRAs. Surprisingly, we recorded a maximum photocurrent density of 1.38 mA/cm 2 at 1.3 V versus reversible hydrogen electrode for TiO 2 NRAs annealed in O 2 , which is about 28 times higher than that of the pristine TiO 2 NRAs. We further revealed that the surface adsorbed Cl ions largely suppress the photoresponse of the TiO 2 NRAs as they serve as recombination centers and block the adsorption of water molecules to the surface of TiO 2 NRAs. The enhancement in photocurrent after annealing in O 2 is due to the desorption of the Cl ions, filling of the surface V o , expansion of the depletion layer, and increase of the grain size. Our results shed light on the effect of annealing on the PEC performance of TiO 2 NRAs and offer guidance for annealing of other semiconductor materials.

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Section: Results and Discussionmentioning

confidence: 99%

Role of Cl Ion Desorption in Photocurrent Enhancement of the Annealed Rutile Single-Crystalline TiO₂ Nanorod Arrays

Huang

Bian

2017

J. Phys. Chem. C

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“…It might be possible that the TiO 2 seeds also possess the rutile phase [28]. Additionally, it's worth noting that the intensity of TiO 2 (101) is significantly lower than (200) of SnO 2 , which is different from the case of TiO 2 NRAs grown on bare FTO in our previous reports [24,29]. It suggests that the presence of the seeds might suppress the preferred growth of TiO 2 NRAs, which is reasonable since that the seeding layer made up of thin NPs.…”

Section: Pec Measurements Of Tio 2 Nras For Detection Of Pb 21 Ionsmentioning

confidence: 75%

Photoelectrochemical determination of Pb2+ ions by using TiO2 nanorod arrays grown on FTO substrates via a facile two-stage hydrothermal route

Zhao

et al. 2016

J Mater Sci: Mater Electron

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Aligned TiO 2 nanorod arrays (NRAs) were fabricated on TiCl 4 pretreated fluorine doped tin oxide (SnO 2 :F, FTO) substrates by a facile hydrothermal route. The effects of TiCl 4 concentration (20, 40 and 60 mM) and post-growth treatments were investigated on the PEC performance of TiO 2 NRAs. The optimal PEC performance, owning a low Pb 2? detection limit of *2 nM, was achieved in the TiO 2 NRAs which was pretreated with 20 mM TiCl 4 and sintered after growth. It implied that the modification of FTO substrates with a low TiCl 4 concentration was critical for achieving the ideal morphology and performance of TiO 2 NRAs which reached a balance of light harvesting, carrier transport and ion diffusion. Additionally, it was also worth mentioning that the TiCl 4 posttreatment wasn't beneficial to improve the PEC performance of the compact TiO 2 NRAs.

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“…7 Recent results employing one-dimensional (1D) electrodes consisting of nanorods, nanowires, nanofibers, and ordered arrays of nanotubes showed directional transport of electrons and lower recombination. [8][9][10][11][12][13][14] More recently, 3D structures such as inverse opal-based structures and interference lithography patterns have also been introduced as alternative electrode materials. [15][16][17][18] An understanding of how transport and recombination properties are related to the morphology of electrode structures and a comparison of these properties in newly designed electrodes to those of conventional TiO 2 electrodes are important for the further design of new electrode materials.…”

Section: Introductionmentioning

confidence: 99%

Characterization of charge transport properties of a 3D electrode for dye-sensitized solar cells

Cho

Kim

Moon

2013

Phys. Chem. Chem. Phys.

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Electron transport and recombination in three-dimensionally-ordered (3D-ordered) structure electrodes were investigated using intensity-modulated photocurrent and photovoltage spectroscopy. The surface-modified TiO2 inverse opal structure was applied as a 3D electrode. The morphology, crystalline structure and surface states of the 3D-ordered structure were characterized by SEM, TEM and XPS and compared to those of the conventional nanoparticulate TiO2 structure. The performance of the 3D electrode was also evaluated by comparing the transport time and recombination lifetime to those of the conventional electrodes. Remarkably, the recombination lifetime in inverse opal was found to be greater than in nanocrystalline TiO2 by 4.3-6.2 times, thus improving the electron collection efficiency by 10%. Comparing the photovoltaic performance, although the dye adsorption of the 3D-ordered porous electrode is lower, the electrode achieves a photocurrent density comparable to that of a nanoparticulate TiO2 electrode due to the higher light scattering as well as the higher collection efficiency.

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Influence of annealing temperature on performance of dye-sensitized TiO2 nanorod solar cells

Cited by 18 publications

References 28 publications

Role of Cl Ion Desorption in Photocurrent Enhancement of the Annealed Rutile Single-Crystalline TiO₂ Nanorod Arrays

Role of Cl Ion Desorption in Photocurrent Enhancement of the Annealed Rutile Single-Crystalline TiO₂ Nanorod Arrays

Photoelectrochemical determination of Pb2+ ions by using TiO2 nanorod arrays grown on FTO substrates via a facile two-stage hydrothermal route

Characterization of charge transport properties of a 3D electrode for dye-sensitized solar cells

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Influence of annealing temperature on performance of dye-sensitized TiO2 nanorod solar cells

Cited by 18 publications

References 28 publications

Role of Cl Ion Desorption in Photocurrent Enhancement of the Annealed Rutile Single-Crystalline TiO2 Nanorod Arrays

Role of Cl Ion Desorption in Photocurrent Enhancement of the Annealed Rutile Single-Crystalline TiO2 Nanorod Arrays

Photoelectrochemical determination of Pb2+ ions by using TiO2 nanorod arrays grown on FTO substrates via a facile two-stage hydrothermal route

Characterization of charge transport properties of a 3D electrode for dye-sensitized solar cells

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Role of Cl Ion Desorption in Photocurrent Enhancement of the Annealed Rutile Single-Crystalline TiO₂ Nanorod Arrays

Role of Cl Ion Desorption in Photocurrent Enhancement of the Annealed Rutile Single-Crystalline TiO₂ Nanorod Arrays