Efficient and low-cost Cu2S-H4SiW12O40/MoS2 counter electrodes in CdS quantum-dot sensitized solar cells with high short-circuit current density

Li, Lixue; Jin, Zhanbin; Tao, Ran; Li, Fengyan; Wang, Yinmeng; Yang, Xue; Xu, Lin

doi:10.1016/j.jphotochem.2019.03.044

Cited by 10 publications

(2 citation statements)

References 42 publications

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“…II) Moreover, using UV‐light direct excitation of POM is expected, where the electron is excited from the HOMO ( E HOMO = −8.0 eV) to the lowest unoccupied molecular orbital (LUMO) ( E LUMO = −4.5 eV). [ 48 ] POM can directly act as oxidizing agent and generate a reactive oxygen species or as electron source. The excited POM transfers an electron to the ZnO valence band and generates another charge.…”

Section: Resultsmentioning

confidence: 99%

Tunable Photocatalytic Activity of PEO‐Stabilized ZnO–Polyoxometalate Nanostructures in Aqueous Solution

Bernhardt

Düring

Haschke

et al. 2021

Adv Materials Inter

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photocatalysis is of great potential for targeted applications.Due to their unique chemical, electrical, magnetic, mechanical, and optical properties and their catalytic activity, zinc oxide (ZnO) and especially ZnO nanoparticles have received considerable attention in both application fields, solar energy conversion, and catalysis. ZnO is an n-type semiconductor with a wide energy band (3.37 eV) and a high bond energy (60 meV). [1,2] It offers a wide range of properties depending on morphology, size, orientation, and density of the crystals. [3] A good electron mobility, a large volume to surface area ratio, a high UV absorption, and a long life-span are advantageous when used as a photocatalyst in UV-light. [4] The catalytic activity in different model reactions has been examined in dependence on morphology, size and shape, and pH. [3,[5][6][7] As the ZnO properties depend on the structure, numerous nanoparticle synthesis routes have been developed to create different shapes of ZnO structures such as 1D, 2D, and 3D structures including nanorods, nanoneedles, and nanoflowers. [8][9][10][11] A powerful technique to control the morphology is the use of surface-modifying substances, in particular macromole cules. [1] A number of studies have investigated various polymers such as polymethacrylic acid, polyethylene oxide (PEO) and PEO containing copolymers. [11][12][13][14][15] The application of polyethylene oxide-block-polymethacrylic acid (PEO-b-PMAA) copolymers as surface modifiers for ZnO has been thoroughly examined. [16] The photocatalytic activity and selectivity of novel binary and ternary composite nanostructures from polyethylene oxide-stabilized zinc oxide (PEO-ZnO) with and without polyoxometalate (H 4 [Si(W 3 O 10 ) 4 ], POM) are determined in aqueous solution under UV-light. Mono-and di-COOH-end-functionalized PEO polymers are used as surface modifiers, influencing the morphology and stability of the ZnO nanoparticles being synthesized in water. POM acts as an additional versatile photocatalytically active building block resulting in a ternary hybrid structure with tunable photocatalytic activity. Catalytic selectivity is demonstrated by studying photocatalytic dye degradations as model reactions, where the chemical backbone of the dyes and their charge turn out to be the basis for the selectivity. All samples are characterized with dynamic light scattering, transmission electron microscopy, scanning electron microscopy, light microscopy, and ζ-potential measurements. With the functionalized PEOs, large ZnO clusters consisting of leaves are formed while 2-[2-(2-methoxyethoxy) ethoxy] acetic acid (TODA) yields ZnO flower-like structures.

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Section: Resultsmentioning

confidence: 99%

Tunable Photocatalytic Activity of PEO‐Stabilized ZnO–Polyoxometalate Nanostructures in Aqueous Solution

Bernhardt

Düring

Haschke

et al. 2021

Adv Materials Inter

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“…As a wide bandgap semiconductor, titanium dioxide (TiO 2 ) has attracted great attention for its particular advantages of rich abundance, low-cost, temperature stability and chemical stability [24]. Cadmium sulfide (CdS) is widely used as an n-type photosensitive semiconductor material in optoelectronic devices [25][26][27][28][29][30]. In a TiO 2 /CdS heterojunction structure, TiO 2 can promote the separation of photon-generated electron-hole pairs from CdS [31,32].…”

Section: Introductionmentioning

confidence: 99%

Tunable p- and n-type Nb:TiO₂ and performance optimizing of self-powered Nb:TiO₂/CdS photodetectors

Wang

Chen

Min

et al. 2020

Semicond. Sci. Technol.

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For the first time, Niobium-doped titanium dioxide (Nb:TiO 2 , NTO) and cadmium sulfide (CdS) are selected for building self-powered photodetectors for optimizing the performance. The p-or n-type NTO and the band structures of the heterojunctions can be controlled by doping Nb and tuning the sputtering power. A low sputtering power tends to produce pure anatase crystals and a high power induces an additional rutile phase aligned in the ( 200) orientation. NTO films deposited at a sputtering power of 120 W show p-type behavior attributed to the compensation of oxygen vacancies. NTO films deposited at 180 W contain mixed anatase and rutile phases with lattice imperfections and show n-type semiconductor properties after annealing. By measuring the energy band structure of the n-n-type anatase-TiO 2 /CdS, p-n-type anatase-NTO/CdS, and n-n-type mix-NTO/CdS heterojunctions, we identify the interface carrier motion characteristics and tune the energy band structure to optimize the performance of the photodetectors. Without any external power supply, the responsivities reach at least 0.125A/W in the mix-NTO/CdS (light source: 550 nm) and the response speed is lower than 10 ms, which can be used for building a self-powered photodetector.

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Photovoltaic performance and electrochemical impedance spectroscopy analysis of CdS/CdSe-sensitized solar cell based on surfactant-modified ZnS treatment

et al. 2020

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Efficient and low-cost Cu2S-H4SiW12O40/MoS2 counter electrodes in CdS quantum-dot sensitized solar cells with high short-circuit current density

Cited by 10 publications

References 42 publications

Tunable Photocatalytic Activity of PEO‐Stabilized ZnO–Polyoxometalate Nanostructures in Aqueous Solution

Tunable Photocatalytic Activity of PEO‐Stabilized ZnO–Polyoxometalate Nanostructures in Aqueous Solution

Tunable p- and n-type Nb:TiO₂ and performance optimizing of self-powered Nb:TiO₂/CdS photodetectors

Photovoltaic performance and electrochemical impedance spectroscopy analysis of CdS/CdSe-sensitized solar cell based on surfactant-modified ZnS treatment

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Efficient and low-cost Cu2S-H4SiW12O40/MoS2 counter electrodes in CdS quantum-dot sensitized solar cells with high short-circuit current density

Cited by 10 publications

References 42 publications

Tunable Photocatalytic Activity of PEO‐Stabilized ZnO–Polyoxometalate Nanostructures in Aqueous Solution

Tunable Photocatalytic Activity of PEO‐Stabilized ZnO–Polyoxometalate Nanostructures in Aqueous Solution

Tunable p- and n-type Nb:TiO2 and performance optimizing of self-powered Nb:TiO2/CdS photodetectors

Photovoltaic performance and electrochemical impedance spectroscopy analysis of CdS/CdSe-sensitized solar cell based on surfactant-modified ZnS treatment

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Tunable p- and n-type Nb:TiO₂ and performance optimizing of self-powered Nb:TiO₂/CdS photodetectors