The effect of functionally graded porous nano structure TiO2 photoanode on efficiency of dye sensitized solar cells

Hejazi, Seyyed Mohammad Hossein; Mohandesi, Jamshid Aghazadeh; Javanbakht, Mehran

doi:10.1016/j.solener.2016.11.033

Cited by 10 publications

(6 citation statements)

References 24 publications

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“…In addition, in the field of photoelectrochemical (PEC) research, various studies have been conducted in which such physical defects increase the surface area that enables responding to external factors (light, gas, and biomarker etc. ). − Moreover, to improve the absorption efficiency, some researchers have introduced scattering layers using a porous layer . Therefore, it can be considered that these holes in the porous layer played a role not only in response to light but also in enhancing the absorption efficiency.…”

Section: Results and Discussionmentioning

confidence: 99%

“…35−37 Moreover, to improve the absorption efficiency, some researchers have introduced scattering layers using a porous layer. 38 Therefore, it can be considered that these holes in the porous layer played a role not only in response to light but also in enhancing the absorption efficiency. This hypothesis of induced sub-gap states was supported by converging pieces of evidence, such as the results of the UV− vis absorption and UPS results.…”

Section: Resultsmentioning

confidence: 99%

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Novel Method for Fabricating Visible-Light Phototransistors Based on a Homojunction-Porous IGZO Thin Film Using Mechano-Chemical Treatment

Lee

Jung

Choi

et al. 2021

ACS Appl. Mater. Interfaces

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A homojunction-structured oxide phototransistor based on a mechano-chemically treated indium–gallium–zinc oxide (IGZO) absorption layer is reported. Through this novel and facile mechano-chemical treatment, mechanical removal of the cellophane adhesive tape induces reactive radicals and organic compounds on the sputtered IGZO film surface. Surface modification, following the mechano-chemical treatment, caused porous sites in the solution-processed IGZO film, which can give rise to a homojunction-porous IGZO (HPI) layer and generate sub-gap states from oxygen-related defects. These intentionally generated sub-gap states played a key role in photoelectron generation under illumination with relatively long-wavelength visible light despite the wide band gap of IGZO (>3.0 eV). Compared with conventional IGZO phototransistors, our HPI phototransistor displayed outstanding optoelectronic characteristics and sensitivity; we measured a threshold voltage (V th) shift from 3.64 to −6.27 V and an on/off current ratio shift from 4.21 × 1010 to 4.92 × 102 under illumination with a 532 nm green light of 10 mW/mm2 intensity and calculated a photosensitivity of 1.16 × 108. The remarkable optoelectronic characteristics and high optical transparency suggest optical sensor applications.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Novel Method for Fabricating Visible-Light Phototransistors Based on a Homojunction-Porous IGZO Thin Film Using Mechano-Chemical Treatment

Lee

Jung

Choi

et al. 2021

ACS Appl. Mater. Interfaces

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“…The one-step and two-step furnace-sintered mesoporous TiO 2 layers (Figures S6b and c) are crack-free without distortion and presented similar average thicknesses of 9.7 and 9.6 μm, respectively. The reduction in the layer thickness is associated with the evaporation of the organic binders and the interconnection of the TiO 2 nanoparticles which resulted in shrinkage of the layers . All the layers sintered by the laser (Figure S6) at the power density of 85 W cm –2 with the variation of the duty cycles are crack-free with good adhesion between the compact TiO 2 layers and the ITO-glass substrates, as well as between the mesoporous and compact TiO 2 layers.…”

Section: Resultsmentioning

confidence: 99%

One-Step Fiber Laser Fabrication of Mesoporous and Compact TiO₂ Layers for Enhanced Performance of Dye-Sensitized Solar Cells

Hadi

Chen

Curioni

et al. 2018

ACS Sustainable Chem. Eng.

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Mesoporous TiO 2 structure (mp-TiO 2) with a compact TiO 2 blocking layer (bl-TiO 2) has been recognized as an effective photoanode for high performance dye sensitized solar cells (DSSCs). However, producing both mesoporous and compact TiO 2 layers by conventional methods requires high temperature furnace process via a two-step manufacturing route. Here, a one-step laser technique has been successfully developed to generate both mesoporous and compact TiO 2 layers on tin doped indium oxide (ITO) coated glass by a millisecond pulsed fiber laser with a wavelength of 1070 nm in ambient atmosphere. Compared with conventional furnace processes, the laser process exhibits a significant reduction of overall fabrication time from 5 h 20 min to 2 min. More importantly, the DSSCs fabricated by the laser process shows a remarkable improvement with the maximum power conversion efficiency (PCE) by 34% compared with the DSSCs fabricated by the furnace. The short-circuit current density (J sc) reaches 16.5 mA cm-2 for the DSSCs fabricated by the laser process while 10.6 mA cm-2 is obtained for that fabricated by the furnace process. The improvement is associated with the increased dye adsorption, decreased charge transfer resistance and increased electron lifetime of the TiO 2 photoanode fabricated by the laser process.

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“…Finding reports in the literature that compare the number of layers of ZnO nanostructures is not straightforward because this architecture is a novel strategy to increase the surface area. Some researchers reported that the use of multilayers results in an increase of the overall conversion efficiency [46][47][48] . However, in our case, adding more layers of urchins was detrimental for the DSSC efficiency, despite the increase of dye loading and light absorption.…”

Section: Discussionmentioning

confidence: 99%

Design of Multilayers of Urchin-like ZnO Nanowires Coated with TiO₂Nanostructures for Dye-Sensitized Solar Cells

Karam

Habchi

Tingry

et al. 2018

ACS Appl. Nano Mater.

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In dye-sensitized solar cells, the photovoltaic efficiency of nanowires (NW) is still limited by their surface area and loss of light absorption compared with nanoparticle (NP) architectures. To overcome this limitation, the light harvesting efficiencies must be improved by increasing the total NW array surface area, without increasing too much the traveled distance of electrons.Here, we describe the design of a 3D architecture based on polystyrene spheres (PS) coated with ordered multilayers of urchin-like ZnO NWs (U-ZnO NWs) to be used as a high surface area nanostructure photoanode for dye-sensitized solar cells. Two to four layers of U-ZnO NWs were synthesized by using PS of 1 and 5 µm in diameter. The ordered layers of U-ZnO NWs were then coated with a thin layer of TiO2 by atomic layer deposition, and topped with a ~ 9-14 µm thick layer of anatase TiO2 NPs. We found that assembling organized layers of U-ZnO NWs significantly increased the surface area and provided better photon absorption. Moreover, coating the U-ZnO NWs with a thin TiO2 layer decreased the charge recombination and consequently enhanced the photovoltaic efficiency.

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The effect of functionally graded porous nano structure TiO2 photoanode on efficiency of dye sensitized solar cells

Cited by 10 publications

References 24 publications

Novel Method for Fabricating Visible-Light Phototransistors Based on a Homojunction-Porous IGZO Thin Film Using Mechano-Chemical Treatment

Novel Method for Fabricating Visible-Light Phototransistors Based on a Homojunction-Porous IGZO Thin Film Using Mechano-Chemical Treatment

One-Step Fiber Laser Fabrication of Mesoporous and Compact TiO₂ Layers for Enhanced Performance of Dye-Sensitized Solar Cells

Design of Multilayers of Urchin-like ZnO Nanowires Coated with TiO₂Nanostructures for Dye-Sensitized Solar Cells

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The effect of functionally graded porous nano structure TiO2 photoanode on efficiency of dye sensitized solar cells

Cited by 10 publications

References 24 publications

Novel Method for Fabricating Visible-Light Phototransistors Based on a Homojunction-Porous IGZO Thin Film Using Mechano-Chemical Treatment

Novel Method for Fabricating Visible-Light Phototransistors Based on a Homojunction-Porous IGZO Thin Film Using Mechano-Chemical Treatment

One-Step Fiber Laser Fabrication of Mesoporous and Compact TiO2 Layers for Enhanced Performance of Dye-Sensitized Solar Cells

Design of Multilayers of Urchin-like ZnO Nanowires Coated with TiO2Nanostructures for Dye-Sensitized Solar Cells

Contact Info

Product

Resources

About

One-Step Fiber Laser Fabrication of Mesoporous and Compact TiO₂ Layers for Enhanced Performance of Dye-Sensitized Solar Cells

Design of Multilayers of Urchin-like ZnO Nanowires Coated with TiO₂Nanostructures for Dye-Sensitized Solar Cells