The Experts below are selected from a list of 141 Experts worldwide ranked by ideXlab platform
Zhengguo Jin - One of the best experts on this subject based on the ideXlab platform.
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Preparation of SnS quantum dots for solar cells application by an in-situ solution chemical Reaction process
Materials Science in Semiconductor Processing, 2015Co-Authors: Xuerong Zheng, Zhengguo JinAbstract:Abstract SnS quantum dots (QDs) with size of 8 nm were synthesized by an in-situ room temperature solution chemical Reaction process. Stannous chloride, as Sn precursor, was coated on the TiO 2 photo-anodes to form a solid precursor film. Ammonium sulfide was dissolved into ethanol to form Anionic Reaction solution. SnS quantum dots were generated by immersing the Sn-coated TiO 2 photo-anodes into the Anionic solution. The structure, morphology and optical absorption properties of the SnS/TiO 2 photoanodes were investigated by means of XRD, SEM, TEM and UV–vis measurements. The photovoltaic properties of the SnS QDs sensitized TiO 2 solar cells were optimized by changing the number of deposition cycles of the SnS QDs. It turns out that the SnS/TiO 2 solar cell with 20 deposition cycles exhibited the best photovoltaic performance with an open-circuit voltage V oc of 510 mV, a short-circuit current density Jsc of 2.41 mA, a fill factor FF of 0.49 and a power conversion efficiency η of 0.61% under AM 1.5 illumination. This result is interpreted in terms of minimization of the charge transfer resistance. The performance will drop for further deposition because the charge transfer resistance will increase due to QDs agglomeration.
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Multi‐Layer Deposition and Characteristics of Nanocrystal CdS Thin Films by an In situ Chemical Reaction Process
Journal of the American Ceramic Society, 2012Co-Authors: Juan Chu, Zhengguo Jin, Jingxia Yang, Zhanglian HongAbstract:In this work, an in situ chemical Reaction deposition technique using solid cadmium precursor films as Reaction source and ammonium sulfide-based solutions as Anionic Reaction medium was presented to deposit uniform, crack-free, densely packed nano-crystalline, hexagonal wurzite structure Cadmium sulfide (CdS) thin films. Influence of the Cd:S molar concentrations in separate cationic and Anionic precursor solutions, deposition cycle numbers, and annealing treatment in Ar atmosphere on structure, morphology, film growth, chemical composition, and optical properties of the in situ chemical deposited films are investigated based on XRD, FESEM, AFM, HRTEM, EDS, SAED, and UV–Vis measurements.
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Influence of Anionic concentration and deposition temperature on formation of wurtzite CdS thin films by in situ chemical Reaction method
Journal of Alloys and Compounds, 2012Co-Authors: Juan Chu, Zhengguo Jin, Jingxia Yang, Weidong Wang, Hui Liu, Dalong Wang, Zhanglian HongAbstract:Abstract Nanocrystalline CdS thin films were deposited on glass substrates by a new in situ chemical Reaction synthesis using cadmium precursor solid films as Reaction source and sodium sulfide based solutions as Anionic Reaction medium. The influence of the S:Cd molar concentrations in separate cationic and Anionic precursor solutions and the deposition temperature on the crystallized structure, morphologies, chemical component and optical properties of the deposited CdS films was investigated by X-ray diffraction, field emission scanning electron microscope, energy dispersive X-ray analysis and UV–Vis spectra measurements. The results show that CdS thin films deposited by the in situ chemical Reaction synthesis have wurtzite structure with (0 0 2) plane preferential orientation and this tendency gradually enhances with increase of S:Cd molar concentration ratio. The deposition rate was 80–100 nm thickness per cycle in the range of deposition temperature from 20 °C to 60 °C.
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An in-situ chemical Reaction deposition of nanosized wurtzite CdS thin films
Thin Solid Films, 2012Co-Authors: Juan Chu, Zhengguo Jin, Jingxia Yang, Shu Cai, Zhanglian HongAbstract:Abstract Nanocrystalline CdS thin films were deposited on glass substrates by an ammonia-free in-situ chemical Reaction synthesis technique using cadmium cationic precursor solid films as Reaction source and sodium sulfide based solutions as Anionic Reaction medium. Effects of ethanolamine addition to the cadmium cationic precursor solid films, deposition cycle numbers and annealing treatments in Ar atmosphere on structure, morphology, chemical composition and optical properties of the resultant films were investigated by X-ray diffraction, field emission scanning electron microscope, energy dispersive X-ray analysis and UV–Vis spectra measurements. The results show that CdS thin films deposited by the in-situ chemical Reaction synthesis have wurtzite structure with (002) plane preferential orientation and crystallite size is in the range of 16 nm–19 nm. The growth of film thickness is almost constant with deposition cycle numbers and about 96 nm per cycle.
Zhanglian Hong - One of the best experts on this subject based on the ideXlab platform.
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Multi‐Layer Deposition and Characteristics of Nanocrystal CdS Thin Films by an In situ Chemical Reaction Process
Journal of the American Ceramic Society, 2012Co-Authors: Juan Chu, Zhengguo Jin, Jingxia Yang, Zhanglian HongAbstract:In this work, an in situ chemical Reaction deposition technique using solid cadmium precursor films as Reaction source and ammonium sulfide-based solutions as Anionic Reaction medium was presented to deposit uniform, crack-free, densely packed nano-crystalline, hexagonal wurzite structure Cadmium sulfide (CdS) thin films. Influence of the Cd:S molar concentrations in separate cationic and Anionic precursor solutions, deposition cycle numbers, and annealing treatment in Ar atmosphere on structure, morphology, film growth, chemical composition, and optical properties of the in situ chemical deposited films are investigated based on XRD, FESEM, AFM, HRTEM, EDS, SAED, and UV–Vis measurements.
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Influence of Anionic concentration and deposition temperature on formation of wurtzite CdS thin films by in situ chemical Reaction method
Journal of Alloys and Compounds, 2012Co-Authors: Juan Chu, Zhengguo Jin, Jingxia Yang, Weidong Wang, Hui Liu, Dalong Wang, Zhanglian HongAbstract:Abstract Nanocrystalline CdS thin films were deposited on glass substrates by a new in situ chemical Reaction synthesis using cadmium precursor solid films as Reaction source and sodium sulfide based solutions as Anionic Reaction medium. The influence of the S:Cd molar concentrations in separate cationic and Anionic precursor solutions and the deposition temperature on the crystallized structure, morphologies, chemical component and optical properties of the deposited CdS films was investigated by X-ray diffraction, field emission scanning electron microscope, energy dispersive X-ray analysis and UV–Vis spectra measurements. The results show that CdS thin films deposited by the in situ chemical Reaction synthesis have wurtzite structure with (0 0 2) plane preferential orientation and this tendency gradually enhances with increase of S:Cd molar concentration ratio. The deposition rate was 80–100 nm thickness per cycle in the range of deposition temperature from 20 °C to 60 °C.
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An in-situ chemical Reaction deposition of nanosized wurtzite CdS thin films
Thin Solid Films, 2012Co-Authors: Juan Chu, Zhengguo Jin, Jingxia Yang, Shu Cai, Zhanglian HongAbstract:Abstract Nanocrystalline CdS thin films were deposited on glass substrates by an ammonia-free in-situ chemical Reaction synthesis technique using cadmium cationic precursor solid films as Reaction source and sodium sulfide based solutions as Anionic Reaction medium. Effects of ethanolamine addition to the cadmium cationic precursor solid films, deposition cycle numbers and annealing treatments in Ar atmosphere on structure, morphology, chemical composition and optical properties of the resultant films were investigated by X-ray diffraction, field emission scanning electron microscope, energy dispersive X-ray analysis and UV–Vis spectra measurements. The results show that CdS thin films deposited by the in-situ chemical Reaction synthesis have wurtzite structure with (002) plane preferential orientation and crystallite size is in the range of 16 nm–19 nm. The growth of film thickness is almost constant with deposition cycle numbers and about 96 nm per cycle.
Juan Chu - One of the best experts on this subject based on the ideXlab platform.
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Multi‐Layer Deposition and Characteristics of Nanocrystal CdS Thin Films by an In situ Chemical Reaction Process
Journal of the American Ceramic Society, 2012Co-Authors: Juan Chu, Zhengguo Jin, Jingxia Yang, Zhanglian HongAbstract:In this work, an in situ chemical Reaction deposition technique using solid cadmium precursor films as Reaction source and ammonium sulfide-based solutions as Anionic Reaction medium was presented to deposit uniform, crack-free, densely packed nano-crystalline, hexagonal wurzite structure Cadmium sulfide (CdS) thin films. Influence of the Cd:S molar concentrations in separate cationic and Anionic precursor solutions, deposition cycle numbers, and annealing treatment in Ar atmosphere on structure, morphology, film growth, chemical composition, and optical properties of the in situ chemical deposited films are investigated based on XRD, FESEM, AFM, HRTEM, EDS, SAED, and UV–Vis measurements.
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Influence of Anionic concentration and deposition temperature on formation of wurtzite CdS thin films by in situ chemical Reaction method
Journal of Alloys and Compounds, 2012Co-Authors: Juan Chu, Zhengguo Jin, Jingxia Yang, Weidong Wang, Hui Liu, Dalong Wang, Zhanglian HongAbstract:Abstract Nanocrystalline CdS thin films were deposited on glass substrates by a new in situ chemical Reaction synthesis using cadmium precursor solid films as Reaction source and sodium sulfide based solutions as Anionic Reaction medium. The influence of the S:Cd molar concentrations in separate cationic and Anionic precursor solutions and the deposition temperature on the crystallized structure, morphologies, chemical component and optical properties of the deposited CdS films was investigated by X-ray diffraction, field emission scanning electron microscope, energy dispersive X-ray analysis and UV–Vis spectra measurements. The results show that CdS thin films deposited by the in situ chemical Reaction synthesis have wurtzite structure with (0 0 2) plane preferential orientation and this tendency gradually enhances with increase of S:Cd molar concentration ratio. The deposition rate was 80–100 nm thickness per cycle in the range of deposition temperature from 20 °C to 60 °C.
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An in-situ chemical Reaction deposition of nanosized wurtzite CdS thin films
Thin Solid Films, 2012Co-Authors: Juan Chu, Zhengguo Jin, Jingxia Yang, Shu Cai, Zhanglian HongAbstract:Abstract Nanocrystalline CdS thin films were deposited on glass substrates by an ammonia-free in-situ chemical Reaction synthesis technique using cadmium cationic precursor solid films as Reaction source and sodium sulfide based solutions as Anionic Reaction medium. Effects of ethanolamine addition to the cadmium cationic precursor solid films, deposition cycle numbers and annealing treatments in Ar atmosphere on structure, morphology, chemical composition and optical properties of the resultant films were investigated by X-ray diffraction, field emission scanning electron microscope, energy dispersive X-ray analysis and UV–Vis spectra measurements. The results show that CdS thin films deposited by the in-situ chemical Reaction synthesis have wurtzite structure with (002) plane preferential orientation and crystallite size is in the range of 16 nm–19 nm. The growth of film thickness is almost constant with deposition cycle numbers and about 96 nm per cycle.
Xuerong Zheng - One of the best experts on this subject based on the ideXlab platform.
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Preparation of PbS Quantum Dots on TiO2 Porous Film by an In-Situ Process for Solar Cells Application
Integrated Ferroelectrics, 2015Co-Authors: Xuerong ZhengAbstract:PbS QDs with size of 7–9 nm were deposited by an in-situ room temperature solution chemical Reaction process using lead nitrate cationic resource in a form of solid precursor film and ammonium sulfide as an Anionic Reaction solution. The TiO2 film with PbS QDs deposited by the in-situ method was used to fabricate QDs-sensitized solar cells. The power conversation efficiency of the as prepared solar cells improved by increasing cycle numbers. For 7 deposition cycles of PbS QDs, the PbS/TiO2 device shows an open-circuit voltage (Voc) of 538 mV, a short-circuit current density (Jsc) of 0.145 mA, fill factor (FF) of 0.416 and a power conversion efficiency (η) of 0.163%.
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Synthesis and Photo-Response of CuS Thin Films by an In Situ Multi-Deposition Process at Room Temperature: A Facile and Eco-Friendly Approach
Nano, 2015Co-Authors: Weiyan Liu, Xuerong Zheng, Jian Wang, Junyun Lai, Suqin ZhaoAbstract:Uniform hexagonal covellite CuS thin films were deposited at room temperature by an in situ solution chemical Reaction using copper precursor solid films as cationic source and ammonium sulfide ethanol solution as Anionic Reaction medium. We investigated the influence of both ethanolamine and butanol contents used in copper nitrate/ethylene glycol monomethylether (EGME) cationic solution for the preparation of copper precursor solid films, deposition cycle numbers and annealing treatment of the as-grown thin films by X-ray diffraction (XRD), FESEM, energy dispersive X-ray fluorescence EDX, transmission electron microscopy–Selected area electronic diffraction (TEM–SAED), atomic force microscopy (AFM) and ultraviolet-visible-near-infrared (UV-Vis–NIR) measurements. Photo-response of the CuS thin films was characterized by linear sweep voltammetry. The deposited CuS thin films were used to sensitize TiO 2 anodes for solar cell application. The results showed that the CuS films had two-dimension oriented, half-sheet shaped growing morphology standing disorderly but vertically to substrates, and the calculated texture coefficient TC(102) verified that the half-sheet shaped crystallites had (102) plane orientation. This in situ multi-deposition process had an average deposited rate of 9 nm per cycle, and a self-perfect function to grow smooth, uniform and 2D oriented morphology with increase in the dip-cycle numbers. The photocurrent density was 14.5 Ma/cm2 at 1 V versus Ag / AgCl electrode for the annealed CuS thin films. CuS -sensitized TiO 2 solar cells had a maximum conversion efficiency of 0.224%.
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Preparation of SnS quantum dots for solar cells application by an in-situ solution chemical Reaction process
Materials Science in Semiconductor Processing, 2015Co-Authors: Xuerong Zheng, Zhengguo JinAbstract:Abstract SnS quantum dots (QDs) with size of 8 nm were synthesized by an in-situ room temperature solution chemical Reaction process. Stannous chloride, as Sn precursor, was coated on the TiO 2 photo-anodes to form a solid precursor film. Ammonium sulfide was dissolved into ethanol to form Anionic Reaction solution. SnS quantum dots were generated by immersing the Sn-coated TiO 2 photo-anodes into the Anionic solution. The structure, morphology and optical absorption properties of the SnS/TiO 2 photoanodes were investigated by means of XRD, SEM, TEM and UV–vis measurements. The photovoltaic properties of the SnS QDs sensitized TiO 2 solar cells were optimized by changing the number of deposition cycles of the SnS QDs. It turns out that the SnS/TiO 2 solar cell with 20 deposition cycles exhibited the best photovoltaic performance with an open-circuit voltage V oc of 510 mV, a short-circuit current density Jsc of 2.41 mA, a fill factor FF of 0.49 and a power conversion efficiency η of 0.61% under AM 1.5 illumination. This result is interpreted in terms of minimization of the charge transfer resistance. The performance will drop for further deposition because the charge transfer resistance will increase due to QDs agglomeration.
Jingxia Yang - One of the best experts on this subject based on the ideXlab platform.
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Multi‐Layer Deposition and Characteristics of Nanocrystal CdS Thin Films by an In situ Chemical Reaction Process
Journal of the American Ceramic Society, 2012Co-Authors: Juan Chu, Zhengguo Jin, Jingxia Yang, Zhanglian HongAbstract:In this work, an in situ chemical Reaction deposition technique using solid cadmium precursor films as Reaction source and ammonium sulfide-based solutions as Anionic Reaction medium was presented to deposit uniform, crack-free, densely packed nano-crystalline, hexagonal wurzite structure Cadmium sulfide (CdS) thin films. Influence of the Cd:S molar concentrations in separate cationic and Anionic precursor solutions, deposition cycle numbers, and annealing treatment in Ar atmosphere on structure, morphology, film growth, chemical composition, and optical properties of the in situ chemical deposited films are investigated based on XRD, FESEM, AFM, HRTEM, EDS, SAED, and UV–Vis measurements.
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Influence of Anionic concentration and deposition temperature on formation of wurtzite CdS thin films by in situ chemical Reaction method
Journal of Alloys and Compounds, 2012Co-Authors: Juan Chu, Zhengguo Jin, Jingxia Yang, Weidong Wang, Hui Liu, Dalong Wang, Zhanglian HongAbstract:Abstract Nanocrystalline CdS thin films were deposited on glass substrates by a new in situ chemical Reaction synthesis using cadmium precursor solid films as Reaction source and sodium sulfide based solutions as Anionic Reaction medium. The influence of the S:Cd molar concentrations in separate cationic and Anionic precursor solutions and the deposition temperature on the crystallized structure, morphologies, chemical component and optical properties of the deposited CdS films was investigated by X-ray diffraction, field emission scanning electron microscope, energy dispersive X-ray analysis and UV–Vis spectra measurements. The results show that CdS thin films deposited by the in situ chemical Reaction synthesis have wurtzite structure with (0 0 2) plane preferential orientation and this tendency gradually enhances with increase of S:Cd molar concentration ratio. The deposition rate was 80–100 nm thickness per cycle in the range of deposition temperature from 20 °C to 60 °C.
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An in-situ chemical Reaction deposition of nanosized wurtzite CdS thin films
Thin Solid Films, 2012Co-Authors: Juan Chu, Zhengguo Jin, Jingxia Yang, Shu Cai, Zhanglian HongAbstract:Abstract Nanocrystalline CdS thin films were deposited on glass substrates by an ammonia-free in-situ chemical Reaction synthesis technique using cadmium cationic precursor solid films as Reaction source and sodium sulfide based solutions as Anionic Reaction medium. Effects of ethanolamine addition to the cadmium cationic precursor solid films, deposition cycle numbers and annealing treatments in Ar atmosphere on structure, morphology, chemical composition and optical properties of the resultant films were investigated by X-ray diffraction, field emission scanning electron microscope, energy dispersive X-ray analysis and UV–Vis spectra measurements. The results show that CdS thin films deposited by the in-situ chemical Reaction synthesis have wurtzite structure with (002) plane preferential orientation and crystallite size is in the range of 16 nm–19 nm. The growth of film thickness is almost constant with deposition cycle numbers and about 96 nm per cycle.