Vertical nanosheet-structured ZnO/TiO2 photoelectrodes for highly efficient CdS quantum dot sensitized solar cells

Li, Shengjun; Li, Tao; Gao, Huiping; Wei, Cheng; Li, Wei; Kong, Wenping; Zhang, Weifeng

doi:10.1016/j.electacta.2014.02.042

Cited by 16 publications

(4 citation statements)

References 19 publications

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“…An interesting concept has been exploited by Kim et al, who tried to fill the interpore space between the ZnO NWs (coated with TiO 2 ) by using multiple layers of colloidal CdSe QDs (average diameter: 3.8 nm). The authors evaluated the space among nanowires as about 200 nm, which allowed for multilayer QD assembly obtained by electrostatic layer by layer deposition (20 layers should correspond to about 90 nm).…”

Section: Metal Oxides Alternative To Tio2mentioning

confidence: 99%

“…Vertical ZnO nanosheets, scavenged with TiF 6 2− for generating a TiO 2 layer, have been applied also by Li et al The structures were grown on TCO glass by electrodeposition and different deposition times were explored; device optimization resulted in a PCE as high as 1.95% ( J sc = 6.11 mA cm −2 , V oc = 0.562 V, FF = 57%). As expected, the TiO 2 coating guaranteed for V oc enhancing, mainly due to improvement of electron lifetime.…”

Section: Metal Oxides Alternative To Tio2mentioning

confidence: 99%

“…An outstanding photocurrent density (20.1 mA cm −2 ) has been recently recorded for CdS‐sensitized ZnO nanosheets deposited on weaved titanium wires by a low temperature hydrothermal method …”

Section: Metal Oxides Alternative To Tio2mentioning

confidence: 99%

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Metal Oxide Semiconductors for Dye- and Quantum-Dot-Sensitized Solar Cells

Concina

Vomiero

2014

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115

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This Review provides a brief summary of the most recent research developments in the synthesis and application of nanostructured metal oxide semiconductors for dye sensitized and quantum dot sensitized solar cells. In these devices, the wide bandgap semiconducting oxide acts as the photoanode, which provides the scaffold for light harvesters (either dye molecules or quantum dots) and electron collection. For this reason, proper tailoring of the optical and electronic properties of the photoanode can significantly boost the functionalities of the operating device. Optimization of the functional properties relies with modulation of the shape and structure of the photoanode, as well as on application of different materials (TiO2, ZnO, SnO2) and/or composite systems, which allow fine tuning of electronic band structure. This aspect is critical because it determines exciton and charge dynamics in the photoelectrochemical system and is strictly connected to the photoconversion efficiency of the solar cell. The different strategies for increasing light harvesting and charge collection, inhibiting charge losses due to recombination phenomena, are reviewed thoroughly, highlighting the benefits of proper photoanode preparation, and its crucial role in the development of high efficiency dye sensitized and quantum dot sensitized solar cells.

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Section: Metal Oxides Alternative To Tio2mentioning

confidence: 99%

Section: Metal Oxides Alternative To Tio2mentioning

confidence: 99%

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Metal Oxide Semiconductors for Dye- and Quantum-Dot-Sensitized Solar Cells

Concina

Vomiero

2014

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115

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“…CdS QDs were rstly deposited on the tree-structured ZnO lms through successive ion layer absorption and reaction technique (SILAR) method. The detailed processes were performed following the former studies [21]. For the deposition of CdSe QDs, the CdS sensitized tree-structured ZnO lms were then immersed in a mixed aqueous solution containing Na…”

Section: Sensitization Of Tree-structured Zno Lms and Qdscs Fabricationmentioning

confidence: 99%

Preparation of Tree-Structured ZnO Films And Application In Quantum Dots Sensitized Solar Cells

Dong¹,

Li²,

Cai³

et al. 2021

Preprint

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This study reported the fabrication of tree-structured ZnO films through hydrothermal method. Long ZnO nanowires (NWs) were firstly deposited on the transparent conductive glass substrates. ZnO braches were then grown on the surface of ZnO NWs. The morphology of the as-prepared tree-structured ZnO films was affected by several factors, such as the concentration of Zn(CH3COO)2 in the seed precursor solution, and the hydrothermal reaction time. ZnO branches were vertically grown on the ZnO NWs when the concentration of Zn(CH3COO)2 was 0.04 M. Quantum dots (QDs)-sensitized solar cells were assembled using the CdS/CdSe QDs co-sensitized ZnO films as the photoanodes. The value of Incident photon-to-current conversion eﬃciency (IPCE) in the range of 550–650 nm was obviously enhanced with the growth of ZnO braches. The short-circuit current density (JSC) was increased from 9.65 to 12.60 mA cm-2 when the growth time of ZnO branches was 6 h. The overall PCE increased from 3.21% to 5.19%.

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Counter Electrodes for Quantum‐Dot‐Sensitized Solar Cells

2015

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On the basis of the many advantages of quantum dots (QDs) including multiple exciton generation, high absorption coefficient, and band‐gap energy controllability, quantum‐dot‐sensitized solar cells (QDSSCs) have been studied for a few decades. However, despite the many advantages, improvement in the power‐conversion efficiencies of QDSSCs has been stagnated for a long time. To suggest a breakthrough in this stagnated QDSSC field, counter electrodes (CEs) have been focused on and are introduced in this Review article. Counter electrodes have been paid relatively less attention, whereas QDs and photoanode structures have been intensively studied. Nevertheless, it is an unchanged fact that CEs are also of considerable importance in QDSSCs, as they hold the possibility to enhance the performance of QDSSCs. In this Review, as an introduction, the basic working principles of QDSSCs are covered, and some widely used analytical tools for CEs are discussed, such as current density–voltage measurements, electrochemical impedance spectroscopy, cyclic voltammetry, and Tafel polarization measurements. Then, some interesting representative work on CEs is introduced. Given that various types of CEs exist, categorization of the CEs was conducted as follows: noble metals, metal sulfides, carbon derivatives, conducting polymers, and combinations of these types. With this Review article, it is hoped that insight will be gained to achieve a breakthrough in the stagnant field of QDSSC research.

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Vertical nanosheet-structured ZnO/TiO2 photoelectrodes for highly efficient CdS quantum dot sensitized solar cells

Cited by 16 publications

References 19 publications

Metal Oxide Semiconductors for Dye- and Quantum-Dot-Sensitized Solar Cells

Metal Oxide Semiconductors for Dye- and Quantum-Dot-Sensitized Solar Cells

Preparation of Tree-Structured ZnO Films And Application In Quantum Dots Sensitized Solar Cells

Counter Electrodes for Quantum‐Dot‐Sensitized Solar Cells

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