Enhanced performance of dye-sensitized solar cells based on TiO 2 /MnTiO 3 /MgTiO 3 composite photoanode

Wang, Wenguang; Zhang, Haiyan; Wu, Liangpeng; Li, Jinlun; Qian, Yannan; Li, Yunyong

doi:10.1016/j.jallcom.2015.09.246

Cited by 19 publications

(6 citation statements)

References 33 publications

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“…Charge-recombination processes include the back-transfer of the photoinjected electrons from the conduction band (CB) of the semiconductor film to the oxidized dye molecules or to the redox couples, as well as direct decay from the excited dye molecules to the oxidized dye molecules. − Among them, the back-transfer of electrons is one of the most significant steps in reducing the charge-collection efficiency. With this aim, many groups have introduced a blocking layer between the active layer and the current collector, such as coating a blocking layer on TiO 2 − or the surface modification of TiO 2 with metal/anion doping. − …”

Section: Introductionmentioning

confidence: 99%

High-Performance Dye-Sensitized Solar Cells through Graded Electron Transport in Band-Engineered W-TiO₂ Cascade Layer

Thogiti

Park

Thuy

et al. 2018

ACS Sustainable Chem. Eng.

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The efficiency of TiO2-based dye-sensitized solar cells (DSSCs) has been limited because charge transfer is not fully achieved, and the injected electrons always recombine with the acceptor species before the electrode can collect them. The novel device architecture of offering graded bands into the TiO2 photoanode network of DSSCs is presented to enhance the power conversion efficiency (PCE). Mono (x %) as well as graded (w–x–y–z %) W-doped TiO2 films are prepared to form intermediate bands in the bandgap of TiO2. A significant enhancement in the PCE is achieved when mono x % W-TiO2 films are tested as the photoanode of the DSSCs. Furthermore, DSSCs with band-engineered W-TiO2 cascade layer exhibit significant photovoltaic performance showing graded carrier transport to current collector. In particular, a graded 1–5–7–9 W cascade film exhibits the highest photovoltaic performance of 11.30% without decreasing the open-circuit voltage, which is 48% higher than pristine DSSCs without a blocking layer. This graded carrier transport suggests an innovative route toward harvesting solar energy.

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Section: Introductionmentioning

confidence: 99%

High-Performance Dye-Sensitized Solar Cells through Graded Electron Transport in Band-Engineered W-TiO₂ Cascade Layer

Thogiti

Park

Thuy

et al. 2018

ACS Sustainable Chem. Eng.

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“…3 Recently, considerable attention has been paid to the shape-and size-controlled synthesis of metal titanate nanostructures with versatile performances. 4−7 As an important metal titanate, MnTiO 3 has recently attracted intense attention due to its promising applications in solar cells, 8,9 Li-ion batteries, 10 sensors, 11,12 and multiferroic materials. 13,14 Moreover, it is abundant, nontoxic, and low-cost, which makes it also suitable for dielectric ceramics and photocatalytic applications.…”

Section: Introductionmentioning

confidence: 99%

“…As an important metal titanate, MnTiO 3 has recently attracted intense attention due to its promising applications in solar cells, , Li-ion batteries, sensors, , and multiferroic materials. , Moreover, it is abundant, nontoxic, and low-cost, which makes it also suitable for dielectric ceramics and photocatalytic applications. − Substantial efforts have therefore been devoted to developing efficient methodologies for controlled synthesis of MnTiO 3 nanocrystals. Solid-state reaction between the respective oxides or hydroxides of manganese and titanium is usually employed in industrial processes due to its ability of scale production. , However, this method suffers from some disadvantages such as irregular morphologies, nonuniform distribution of grains, and requirement of very high reaction temperatures (≥800 °C) .…”

Section: Introductionmentioning

confidence: 99%

Simple and Controllable Synthesis of High-Quality MnTiO₃ Nanodiscs and Their Application as A Highly Efficient Catalyst for H₂O₂-Mediated Oxidative Degradation

Wang

Gao

et al. 2018

ACS Appl. Nano Mater.

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Herein, we reported a simple synthesis of monodisperse, uniform, and highly crystalline MnTiO 3 nanodiscs and their application as a new promising catalyst for H 2 O 2 -mediated oxidative degradation. Unlike previously reported method that required use of preprepared titanate nanowires as precursor, this synthesis of well-defined MnTiO 3 nanodiscs was implemented through a one-pot homogeneous reaction process under hydrothermal conditions. The growth of MnTiO 3 nanodiscs was revealed to follow the nucleation− dissolution−recrystallization mechanism, and the (001) crystal facet was preferentially exposed since it was the densest and most thermodynamically stable. Two-dimensional flat plane of the MnTiO 3 nanodiscs helped minimize the diffusion pathway of guest molecules, thus allowing a fast mass transport. Moreover, the Mn(II)-rich structure and distinct crystallinity endowed MnTiO 3 nanodiscs with high activity and stability. In the presence of H 2 O 2 , MnTiO 3 nanodiscs exhibited a high efficiency in catalytic decomposition of a series of organic pollutants with an excellent recycling durability. About 98.6% of methylene blue was catalytically decomposed within 20 min at 30 °C. When the reaction temperature increased to 40 °C, only 8 min was required. Comparative investigation further confirmed the superior catalytic performance of MnTiO 3 nanodiscs, with about 2 times higher removal efficiency than reported under similar conditions.

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“…The chemical treatment is the commonly used process in the recycling or removal of impurities and silicon recovery 4 . As an alternative to the silicon technology, other types of materials, generally called transparent conductor oxides (TCOs), have been investigated in the assembly of silicon free photovoltaic cells [6][7][8] . Thus, the aim of this work was to establish a relationship between TCOs and silicon cells for the studying of the photovoltaic behavior of the system TCO / SAMPLE / TCO.…”

Section: Introductionmentioning

confidence: 99%

Use of SnOx:F in the Recycling of Silicon Solar Cells

et al. 2018

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Amongst the many parts of a silicon cells photovoltaic module, silicon is the most important and expensive constituent. Thus, research on silicon recycling from damaged cells can lead to economic and environmental benefits. In this work, the broken silicon cells were tailored to function along with the fluorine-doped tin oxide as the transparent electric conductors. The broken silicon cells were analyzed by the current density versus voltage plots, together with the Mott-Schottky, X-rays diffraction and fluorescence analysis. Under light, the damaged cells sandwiched between the two transparent electric conductors presented photovoltaic effect. However, such effect was not obtained after the removal of the antireflection layer due to the destruction of the n-type layer as demonstrated by the Mott-Schottky analysis. The X-rays diffraction revealed samples rich on silicon atoms and the presence of aluminum atoms as impurity.

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Enhanced performance of dye-sensitized solar cells based on TiO 2 /MnTiO 3 /MgTiO 3 composite photoanode

Cited by 19 publications

References 33 publications

High-Performance Dye-Sensitized Solar Cells through Graded Electron Transport in Band-Engineered W-TiO₂ Cascade Layer

High-Performance Dye-Sensitized Solar Cells through Graded Electron Transport in Band-Engineered W-TiO₂ Cascade Layer

Simple and Controllable Synthesis of High-Quality MnTiO₃ Nanodiscs and Their Application as A Highly Efficient Catalyst for H₂O₂-Mediated Oxidative Degradation

Use of SnOx:F in the Recycling of Silicon Solar Cells

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Enhanced performance of dye-sensitized solar cells based on TiO 2 /MnTiO 3 /MgTiO 3 composite photoanode

Cited by 19 publications

References 33 publications

High-Performance Dye-Sensitized Solar Cells through Graded Electron Transport in Band-Engineered W-TiO2 Cascade Layer

High-Performance Dye-Sensitized Solar Cells through Graded Electron Transport in Band-Engineered W-TiO2 Cascade Layer

Simple and Controllable Synthesis of High-Quality MnTiO3 Nanodiscs and Their Application as A Highly Efficient Catalyst for H2O2-Mediated Oxidative Degradation

Use of SnOx:F in the Recycling of Silicon Solar Cells

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High-Performance Dye-Sensitized Solar Cells through Graded Electron Transport in Band-Engineered W-TiO₂ Cascade Layer

High-Performance Dye-Sensitized Solar Cells through Graded Electron Transport in Band-Engineered W-TiO₂ Cascade Layer

Simple and Controllable Synthesis of High-Quality MnTiO₃ Nanodiscs and Their Application as A Highly Efficient Catalyst for H₂O₂-Mediated Oxidative Degradation