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UV-activated porous Zn2SnO4 nanofibers for selective ethanol sensing at low temperatures
摘要： Porous ternary Zn2SnO4 nanofibers with a high surface-to-volume ratio were fabricated through an electrospinning technique. UV-activated ethanol sensing responses at low temperatures were revealed using these porous Zn2SnO4 nanofibers as a sensing active layer. The ethanol response was up to 32.5, and the calculated detection limit was as low as 1.6 ppm at a low temperature of 130 °C. The sensor exhibited good ethanol selectivity and stability under UV irradiation. The photoinduced electrons reacted with the absorbed oxygen molecules to form active O? species [O?(hν)], which contributed to the enhanced resistance modulation and low-temperature ethanol response of Zn2SnO4 nanofibers.
关键词： Zn2SnO4,Semiconductors,Electrospinning,UV irradiation,Sensors
更新于2025-11-14 17:04:02
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Enhanced photoelectrochemical performance of Zn2SnO4N by interstitial N induced the build-in polarization electric field
摘要： Highly active Zn2SnO4N photocatalysts were successfully prepared by the one-step microwave-assisted solvothermal method. N heteroatoms were introduced into Zn2SnO4 by occupying the interstitial sites, inducing the formation of the build-in polarization electric field and the impurity level which was advantageous to promote the separation and the migration of photoinduced electron-hole pairs. As a result, the as-prepared Zn2SnO4N exhibited improved the photoelectrochemical properties and the photodegradation rate of RhB over Zn2SnO4N had been demonstrated to increase 3.3 times compared to that of pure Zn2SnO4. Under the effect of the built-in electric field, the impurity level served as a springboard for electron transition rather than a recombination center, which caused the enhancing photocatalytic performance. The finding may provide a new insight into understanding the mechanism of doping modification.
关键词： N-doped,Zn2SnO4,Build-in electric field,Photocatalysis,Impurity level
更新于2025-11-14 17:04:02
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Constructing a novel Zn2SnO4/C/AgBr nanocomposite with extended spectral response and improved photocatalytic performance
摘要： High-ef?cient photocatalyst based on Zn2SnO4/C/AgBr multi-component heterostructure was prepared via a two-step hydrothermal synthesis method followed by chemical deposition process. Morphological studies showed that ultra-?ne AgBr nanoparticles with the size of 3e5 nm were in situ grown on the surface of the carbon layers attached to Zn2SnO4 nanocrystals. UVevis characterization demonstrated that the co-modi?cation of carbon and AgBr contributed to the dramatically improved light absorption ability of Zn2SnO4/C/AgBr nanocomposites. In the multi-component heterostructured photocatalyst, carbon functioning as a charge mediator plays a pivotal role in separating photogenerated electron-hole pairs ef?ciently. Zn2SnO4/C/AgBr photocatalysts exhibited a signi?cant enhancement of visible-light photocatalytic performance toward the photodegradation of rhodamine B (RhB), resulting from the synergistic effect of the intensi?ed visible-light absorption capacity and ef?cient photogenerated electron-hole pairs transfer. In addition, a proposed schematic mechanism for the signi?cant enhancement of photocatalytic performance is as well put forward on the basis of the experimental results.
关键词： Photocatalytic degradation,Visible-light,Heterostructure,Zn2SnO4/C/AgBr
更新于2025-09-23 15:23:52
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The effects of thermal annealing on the structural and electrical properties of Zinc Tin oxide thin films for transparent conducting electrode applications
摘要： The as-deposited and annealed Zinc tin oxide (Zn2SnO4) thin films were deposited by electron beam evaporation technique and were characterized for the structural, optical and electrical properties. The x-ray diffraction technique revealed the amorphous nature of as-deposited thin film while the films annealed at 400, 500 and 6000C in air were found to be polycrystalline. The phase change from amorphous to crystalline Zn2SnO4 results in the higher resistance as revealed by resistance versus temperature measurements. From the Hall Effect, the as deposited film shows the electron mobility and carrier concentrations (electron) equal to 33cm2/V.s and 8.361x 1017cm-3 respectively. The agglomeration of grains in annealed thin films are observed by Atomic Force Microscopy (AFM) technique.The peaks in Optical transmission spectra, observed by using the UV-Vis spectroscopy confirm the creation of sub levels between conduction band minimum and valence band maximum after annealing. The band gaps calculated by Tauc plot explore the possibility of shifting the Fermi level towards valence band maximum after thermal annealing.
关键词： Annealing temperature,Zn2SnO4,Band gap,Oxygen vacancies,Electron beam evaporation,TCOs
更新于2025-09-23 15:22:29
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Preparation of Highly Efficient CoFe2O4/Zn2SnO4 Composite Photocatalyst for the Degradation of Rhodamine B Dye from Aqueous Solution
摘要： CoFe2O4/Zn2SnO4 composite was synthesized using a simple two-step process and applied as a novel-efficient photocatalyst for the rhodamine B degradation from aqueous solution. Characterization techniques such as X-ray diffraction (XRD), N2 adsorption-desorption isotherms, scanning electron microscopy (SEM), EDS analysis, and diffuse reflectance spectroscopy were employed in order to investigate the physical and chemical properties of composite. Higher values of the specific surface area, pore volume and diameter, and a smaller band-gap energy promoted a greater catalytic activity of CoFe2O4/Zn2SnO4 composite when compared to Zn2SnO4. A rapid decolorization of dye solution was observed at 40 min of reaction using the CoFe2O4/Zn2SnO4 catalyst, being 2.5 times faster than the Zn2SnO4 alone. Therefore, the CoFe2O4/Zn2SnO4 composite shows extraordinarily high photocatalytic activity toward the degradation of rhodamine B dye from aqueous solution.
关键词： Coupled oxides,Photocatalysis,Rhodamine B,Synthesis,CoFe2O4/Zn2SnO4
更新于2025-09-23 15:21:21
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Simple Route to Interconnected, Hierarchically Structured, Porous Zn2SnO4 Nanospheres as Electron Transport Layer for Efficient Perovskite Solar Cells
摘要： Constructing electron transport layer (ETL) with higher carrier mobility and suitable bandgap is of key importance as it greatly influences the photovoltaic performance of perovskite solar cells (PSCs). Zn2SnO4 (ZTO) carries a high electron mobility of 10–30 cm2 V-1 s-1, an order of magnitude over the widely used TiO2 ETL in perovskite solar cells (PSCs), rendering it an excellent alternative to TiO2 ETL. Herein, we report a simple yet robust polymer-templating route to interconnected, hierarchically structured, porous ZTO nanospheres as an efficient ETL for high-performance organolead halide PSCs. The porous ZTO nanospheres ETL, composed of an assembly of 4.5-nm ZTO nanoparticles on the surface of porous nanosphere possessing 80-100 nm cavity, renders markedly improved light absorption, enhanced electron extraction, facilitated charger transportation, and suppressed carrier recombination in the resulting PSCs, which exhibit a power conversion efficiency (PCE) of 17.14%, greatly outperforming the device based on the ZTO nanoparticles (14.02%; i.e., without porosity). As such, the strategy for crafting porous yet hierarchically structured semiconductors with high carrier mobility may open up an avenue to create robust ETL, and by extension, hole transport layer (HTL) for high-performance optoelectronics.
关键词： Zn2SnO4,perovskite solar cells,high electron mobility,hierarchical nanostructure,Electron transport layer
更新于2025-09-23 15:19:57
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Highly efficient Zn <sub/>2</sub> SnO <sub/>4</sub> perovskite solar cells through band alignment engineering
摘要： An active absorption layer with a narrow band gap has been achieved through adjusting the halide ratio in a halide perovskite, and it had better energy alignment with the Zn2SnO4 electron transport layer. An e?ciency of 19.37% can be obtained, and this has also been improved to 20.26% through the incorporation of cesium, giving a new triple cation perovskite.
关键词： band alignment engineering,perovskite solar cells,efficiency,Zn2SnO4
更新于2025-09-16 10:30:52
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Enhanced CH4 sensitivity of porous nanosheets-assembled ZnO microflower by decoration with Zn2SnO4
摘要： In recent years, design and synthesis of heterostructured nanomaterials with high gas-sensing performance for detection of flammable and toxic gases has attracted much research interest. In this paper, pristine and Zn2SnO4-decorated ZnO microflowers with the size about 2?5 μm and assembled by porous nanosheets of about 15 nm in thickness were successfully synthesized via a simple solvothermal method and subsequent calcination process. The methane (CH4) sensing properties of the prepared Zn2SnO4/ZnO were investigated and compared with that of the pure ZnO counterpart. It was found that after decorating with a small amount of Zn2SnO4, the ZnO sensor showed an improved gas sensing properties to CH4. At optimum operating temperature of 250 oC, the sensor based on SZ2 (Zn2SnO4/ZnO composite with the optimal Zn2SnO4 contend) shows a response as high as 27.2 to 1000 ppm CH4, which is about 3.2 times higher than that of SZ0 (pristine ZnO) sensor. Meanwhile, the SZ2 sensor also shows a fast response and recover characteristic, low detection limit (1.48 ppm), good repeatability and long-term stability. The Zn2SnO4/ZnO heterostructures related CH4 sensing mechanism was discussed.
关键词： CH4,Zn2SnO4,Hierarchical structures,Gas sensor,Heterostructures
更新于2025-09-12 10:27:22
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Improved Interface Charge Extraction by Double Electron Transport Layers for High‐Efficient Planar Perovskite Solar Cells
摘要： Charge extraction by electron transport layers (ETLs) plays a vital role in improving the performance of perovskite solar cells (PSCs). Here, PSCs with four different types of ETLs, such as SnO2, amorphous-Zn2SnO4 (am-ZTO), am-ZTO/SnO2, and SnO2/am-ZTO, are successfully synthesized. The interface recombination behavior and the charge transport properties of the devices affected by four types of ETLs are systematically investigated. For dual am-ZTO/SnO2 ETLs, compact am-ZTO ETL prepared by the pulsed laser deposition method provides a dense physical contact with FTO than the spin coating films, decreasing leakage current and improving charge collection at the interface of ETL/FTO. Moreover, dual am-ZTO/SnO2 ETLs lead to large free energy difference (ΔG), improving electron injection from perovskite to ETLs. One additional electron pathway from perovskite to am-ZTO is formed, which can also improve electron injection efficiency. A power conversion efficiency of 20.04% and a stabilized efficiency of 19.17% are achieved for the device based on dual am-ZTO/SnO2 ETLs. Most importantly, the devices are fabricated at a low temperature of 150 °C, which offers a potential method for large-scale production of PSCs, and paves the way for the development of flexible PSCs. It is believed that this work provides a strategy to design ETLs via controlling ΔG and interface contact to improve the performance of PSCs.
关键词： amorphous-Zn2SnO4/SnO2,charge transport,perovskite solar cells,interface recombination
更新于2025-09-11 14:15:04
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Highly efficient perovskite solar cells based on a Zn2SnO4 compact layer
摘要： In the present work, a new reflux condensation route has been developed for synthesizing Zn2SnO4 film, which was first used as a compact layer in a perovskite solar cell (PSC), and achieved an efficiency of 20.1%. The high efficiency of PSC could be contributed to the following: i) As a compact layer in a PSC, Zn2SnO4 exhibits high electron mobility and has an appropriate energy band structure, resulting in the efficient extraction of carriers and transport of electrons; ii) the surface of the FTO substrate is completely covered by a Zn2SnO4 compact layer, and the direct contact between a perovskite layer and FTO is prevented, leading to significantly efficiently suppression of charge recombination. Consequently, the cell consisting of a Zn2SnO4 compact layer exhibits excellent photovoltaic performance.
关键词： Zn2SnO4,photovoltaic property,compact layer,perovskite solar cells,charge recombination,energy band structure
更新于2025-09-11 14:15:04