Ultra-high aspect ratio titania nanoflakes for dye-sensitized solar cells

Lee, Yang-Yao; El‐Shall, H.

doi:10.1016/j.apsusc.2017.08.190

Cited by 9 publications

(3 citation statements)

References 27 publications

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“…Higher aspect ratios of ZnO NRs enhanced the dye loading and, hence, the number of photogenerated electrons, which was a significant factor in improving the efficiency of a DSSC. 37,38 Also, it was found that the fill factor decreased linearly with an increase in the size of the ZnO NRs. The decrease in the fill factor has been ascribed to the increase in the resistance to electron transport at the semiconductor−FTO glass interface.…”

Section: Methodsmentioning

confidence: 98%

Hydrothermal Growth of ZnO Nanorods for Use in Dye-Sensitized Solar Cells

Kumar

Gupta

Bansal

2021

ACS Appl. Nano Mater.

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Zinc oxide nanorods were grown hydrothermally and used as a photoanodic material in dye-sensitized solar cells (DSSCs). The influence of hydrothermal growth time on the synthesis of ZnO nanorods was expounded by various characterizations, viz., FESEM, EDXS, XRD, FTIR, XPS, and UV−visible spectroscopy. The FESEM imaging ascertained the rod-shape morphology of ZnO. The XRD and FTIR measurements confirmed the formation of the defect-free and crystalline hexagonal wurtzite ZnO nanorod-like structure. The XRD calculations also demonstrated the increase in lattice strain and thereby the length of ZnO nanorods as a result of an increase in the hydrothermal growth time. The purity and surface properties of ZnO nanorods were confirmed by EDXS and XPS. The UV−visible spectroscopy revealed an electronic transition in bandgap energy due to quantum confinement effect, resulting in a decrease in the bandgap energy. The consequences of reaction time were also observed on the photovoltaic parameters of the DSSCs. The DSSC fabricated with the 9-ZNR sample exhibited a maximum efficiency of 1.62%, and hence the optimal time for the growth of ZnO nanorods was confirmed as 9 h. A passivating layer of TiO 2 on ZnO nanorods boosted the efficiency by almost 2-fold, which was ascribed to factors like a decrease in the interfacial charge recombination, a reduction in the dissolution of ZnO, and a reduction in interfacial traps.

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Section: Methodsmentioning

confidence: 98%

Hydrothermal Growth of ZnO Nanorods for Use in Dye-Sensitized Solar Cells

Kumar

Gupta

Bansal

2021

ACS Appl. Nano Mater.

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“…The photovoltaic industry has experienced rapid development for several decades, owing to its environmental friendliness and renewability [1][2][3][4][5]. In recent years, many kinds of new methods have been proposed to prepare solar cells with excellent electrical performance [6][7][8][9][10]. Because of its high photoelectric conversion efficiency, low temperature coefficient, and low cost, the heterojunction solar cell (HJT solar cell) has been investigated by many scientific research institutions and companies [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Study on the Curing Process of Silver Paste of Heterojunction Solar Cells Using Response Surface Methodology

Li¹,

Dong²,

Guo³

et al. 2020

Applied Sciences

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Adhesion strength is of great importance for silver paste of heterojunction solar cells (HJT silver paste). It has a close relation with the curing system, as well as the curing process or curing conditions of the paste. The interactions among all the curing conditions such as curing time (t, min), treatment temperature (T, °C), and curing agent dosage (m, wt%) are obviously complex and hard to analyze. Response surface methodology (RSM) is used to research the interactions among t, T, and m and to optimize the curing process. The results of this study indicate that an increase of curing time and treatment temperature both had a positive effect on adhesion strength. The effect of curing time is more obvious under a lower treatment temperature. 41 wt%, 199 °C, and 44 min were determined as the optimum process conditions. The quadratic model predictions fitted well with the experimental data with a deviation less than 3%. The FTIR results indicated that there were both addition and esterification processes in the reaction of E51 and ring-open MeTHPA. Scanning electron microscopy (SEM) images showed that the silver paste formed a dense interconnected network and provided a continuous pathway for current carrier transmission. This research demonstrated the effectiveness of the E51-MeTHPA system for HJT silver paste and the superiority of RSM in studying the curing process of silver paste.

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“…Moreover, the photoexcited electron-hole pairs tend to recombine easily, which leads to low photoquantum efficiency. Researchers have utilized many effective methods to address these issues and have achieved few and partially satisfactory results in such fields as noble metal loading [ 19 , 20 ], dye-sensitizing [ 21 , 22 ], semiconductor mixing [ 23 , 24 ], and ion doping [ 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

The Electronic Structure and Optical Properties of Anatase TiO2 with Rare Earth Metal Dopants from First-Principles Calculations

et al. 2018

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The electronic and optical properties of the rare earth metal atom-doped anatase TiO2 have been investigated systematically via density functional theory calculations. The results show that TiO2 doped by Ce or Pr is the optimal choice because of its small band gap and strong optical absorption. Rare earth metal atom doping induces several impurity states that tune the location of valence and conduction bands and an obvious lattice distortion that should reduce the probability of electron–hole recombination. This effect of band change originates from the 4f electrons of the rare earth metal atoms, which leads to an improved visible light absorption. This finding indicates that the electronic structure of anatase TiO2 is tuned by the introduction of impurity atoms.

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Ultra-high aspect ratio titania nanoflakes for dye-sensitized solar cells

Cited by 9 publications

References 27 publications

Hydrothermal Growth of ZnO Nanorods for Use in Dye-Sensitized Solar Cells

Hydrothermal Growth of ZnO Nanorods for Use in Dye-Sensitized Solar Cells

Study on the Curing Process of Silver Paste of Heterojunction Solar Cells Using Response Surface Methodology

The Electronic Structure and Optical Properties of Anatase TiO2 with Rare Earth Metal Dopants from First-Principles Calculations

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