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Thermally and Optical-Induced Effect on Optical and Electrical Parameters of Ag-Doped cdse Thin Films

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Acta Metallurgica Sinica(English Letters) 2015年第5期28卷 591-599页

作者： Jagdish Kaur S.K.Tripathi Department of Physics Panjab University

Thin films of Ag-doped cdse are deposited on the glass substrates by thermal evaporation technique using inert gas condensation method. The elemental composition of the prepared thin film is confirmed by EDX spectra. SEM analysis reveals the uniform distribution of the grains over the substrate. TEM analysis reveals the spherical nature of nanoparticles having size in the range of 25-30 nm. X-ray diffraction study indicates an increase in the grain size after thermal annealing and the decrease in the grain size after light soaking treatment. Transmittance spectra are found to decrease with corre- sponding red shift after annealing and light soaking of as-deposited thin films. The value of the band gap is found to decreases and refractive index increases, after annealing and light soaking treatment. The dispersion of refractive index is described using the Wemple-DiDomenico single oscillator model and the effects of the annealing and the light soaking on the dispersion parameters are studied. The dark conductivity is found to change from 2.24 × 10^-8 to 1.54 × 10^-7 and 1.45 ×10^-9 Ω-1 cm-1 after annealing and light soaking of thin films, respectively. Hall effect measurement reveals n-type behavior of as-deposited, annealed and light-soaked thin films.

关键词： cdse Thin film Surface treatment Electrical properties

Influence of acid and alkaline sources on optical, structural and photovoltaic properties of cdse nanoparticles precipitated from aqueous solution

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Frontiers of Materials Science 2016年第2期10卷 168-177页

作者： C. Selene CORIA-MONROY Merida SOTELO-LERMA Hailin HU Instituto de Energias Renovables Universidad Nacional Autonoma de Mexico (UNAM) Priv. Xochicalco S/N 62580 Temixco Morelos Mexico Universidad de Sonora Blvd. Luis Encinas y Rosales S/N Col. Centro Hermosillo Sonora Mexico

cdse is a widely researched material for photovoltaic applications. One of the most important parameters of the synthesis is the pH value, since it determines the kinetics and the mechanism of the reaction and in consequence, the optical and morphological properties of the products. We present the synthesis of cdse in solution with strict control of pH and the comparison of ammonia and KOH as alkaline sources and diluted HCI as acid medium. cdse formation was monitored with photoluminescence emission spectra （main peak in 490 nm, bandgap of cdse nanoparticles）. XRD patterns indicated that cdse nanoparticles are mainly of cubic structure for ammonia and HCI, but the hexagonal planes appear with KOH. Product yield decreases with pH and also decreases with KOH at constant pH value since ammonia has a double function, as complexing agent and alkaline source. Changes in morphology were observed in SEM images as well with the different alkaline source. The effect of alkaline sources on photovoltaic performance of hybrid organic solar cells with cdse and poly（3-hexylthio- phene） as active layers was clearly observed, indicating the importance of synthesis conditions on optoelectronic properties of promising semiconductor nanomaterials for solar cell applications.

关键词： cdse optical properties morphological properties hybrid solar cells

Femtosecond Time-Resolved Near-Field Spectroscopy of cdse Nanocluster Films

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Chinese Physics Letters 1999年第9期16卷 683-685页

作者： YAN Hong QIAN Wei DENG Yu-jun XIA Zong-ju ZOU Ying-hua ZHANG Jing-bo LIN Yuan XIAO Xu-rui Department of Physics Mesoscopic Physics LaboratoryPeking UniversityBeijing 100871 Institute of Photographic Chemistry Chinese Academy of SciencesBeijing 100101

By using scanning near-field optical microscopy in the femtosecond time-resolved pump-probe experiments, we have studied the time-resolved near-field spectroscopy of cdse nanocluster films. The submicrometer space dependence of electron dynamics was observed, which is attributed to the non-uniform distributions of interstitial defects in the films.

关键词： pump Femto cdse

Large area van der Waals epitaxy of II-VI cdse thin films for flexible optoelectronics and full-color imaging

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Nano Research 2022年第1期15卷 368-376页

作者： Wenwu Pan Junliang Liu Zekai Zhang Renjie Gu Alexandra Suvorova Sarah Gain Han Wang Ziyuan Li Lan Fu Lorenzo Faraone Wen Lei Department of Electrical Electronic and Computer EngineeringThe University of Western Australia35 Stirling HighwayCrawley 6009Australia Centre for Microscopy Characterisation and AnalysisThe University of Western Australia35 Stirling HighwayPerth 6009Australia Department of Electronic Materials Engineering Research School of PhysicsThe Australian National UniversityCanberra ACT 2601Australia

The demand for future semiconductor devices with enhanced performance and lower cost has driven the development of epitaxial growth of high quality,free-standing semiconductor thin film materials without the requirement of lattice matching to the substrate,as well as their transfer to other substrates and associated device processing *** work presents a study on the van der Waals epitaxy based molecular beam epitaxy of cdse thin films on two-dimensional layered mica substrates,as well as related etch-free layer transfer technology of large area,free-standing layers and their application in flexible photodetectors for full-color *** photoconductor detectors based on these flexible cdse thin films demonstrate excellent device performance at room temperature in terms of responsivity(0.2 A·W^(-1))and detectivity(1.5×10^(12)Jones),leading to excellent full-color imaging quality in the visible spectral *** etch-free and damage-free layer transfer method has been developed for transferring these cdse thin films from mica to other substrate for further device processing and *** results demonstrate the feasibility of van der Waals epitaxy method for growing high quality,large area,and free-standing epitaxial layers without the requirement for lattice matching to substrate for applications in low-cost flexible and/or monolithic integrated optoelectronic devices.

关键词： cdse flexible devices van der Waals epitaxy molecular beam epitaxy layer lift-off

SYNTHESIS AND CHARACTERIZATION OF WATER-SOLUBLE cdse NANOPARTICLES CAPPED BY AOT

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Chinese Journal of Polymer Science 2013年第9期31卷 1284-1289页

作者： Yan-ming Chen Xiao-bo Nie School of Petrochemical Engineering Shenyang University of Technology

Water-soluble cdse nanoparticles were synthesized using AOT （sodium bis（2-ethylehexyl）-sulfosuccinate） as stabilizer, cadmium acetate and NazSeSO3 as precursors in aqueous phase. The influence of some key factors, such as reaction time, temperature, concentration and molar ratio of precursors on the optical properties of cdse nanoparticles was systematically investigated through UV-Vis and PL spectra. Powder X-ray diffraction （XRD） was used to characterize the crystalline structure of synthesized cdse nanoparticles. As-prepared cdse nanoparticles exhibit an apparent quantum confinement effect and typical hexagonal wurtzite structures. Finally, the optimal experimental conditions were obtained.

关键词： AOT cdse Nanoparticles Aqueous phase.

Synthesis of cdse quantum dots via paraffin liquid and oleic acid

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第1期9卷 133-136页

作者： Yu-feng LIAO Wen-jiang LI Centre for Optical and Electromagnetic Research State Key Laboratory for Modern Optical Instrumentation Joint Research Center of Photonics of the Royal Institute of Technology （Sweden） and Zhejiang University Zhejiang University Hangzhou 310058 China

This paper reported an efficient and rapid method to produce highly monodispersed cdse quantum dots (QDs), in which the traditional trioctylphosphine oxide (TOPO) was replaced by paraffin liquid as solvent and oleic acid as the reacting media. The experimental conditions and the properties of QDs had been studied in detail. The resulting samples were confirmed of uniform size distribution with transmission electronic microscopy (TEM), while UV-vis absorption and photoluminescence (PL) spectra clearly indicated that such synthesized QDs had good fluorescence properties.

关键词： cdse Synthesis Quantum dots (QDs) Fluorescence

Structural, Optical and Electrical Properties of Evaporated cdse Films

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Journal of Materials Science & Technology 1995年第2期11卷 97-101页

作者： H.P. Sarma, N.Rangaraan and K.R.Murali(Central Electrochemical Research Institute, Karaikudi -623 006, India) Central Electrochemical research Inst Karaikudi India

cdse films are of great interest for use in thin film photoelectric devices. A simple chemical precipitation method is adopted for the first time to synthesise cdse powder. Films on glass obtained at different substrate temperatures TS such as 300, 373, 423 and 473 K have been characterised by X-ray diffraction, optical absorption and Hall measurements.

关键词： cdse ASTM Structural Optical and Electrical Properties of Evaporated cdse Films

Photoluminescence of cdse Nanowires Grown With and Without Metal Catalyst

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Nano Research 2011年第4期4卷 343-359页

作者： Andrea Fasoli Alan Colli Faustino Martelli Simone Pisana Ping Heng Tan Andrea C. Ferrari Department of Engineering University of Cambridge Cambridge CB3 0FA UK Nokia Research Centre Broers Building （East Forum） Cambridge CB3 0GT UK lstituto per la Microelettronica e i Microsistemi del CNR 00133 Rome Italy SKLSM Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 China

We present temperature and power dependent photoluminescence measurements on cdse nanowires synthesized via vapor-phase with and without the use of a metal catalyst. Nanowires produced without a catalyst can be optimized to yield higher quantum efficiency, and narrower and spatially uniform emission, when compared to the catalyst-assisted ones. Emission at energies lower than the band-edge is also found in both cases. By combining spatially-resolved photoluminescence and electron microscopy on the same nanowires, we show that catalyst-free nanowires exhibit a low-energy peak with sharp phonon replica, whereas for catalyst-assisted nanowires low-energy emission is linked to the presence of nanostructures with extended morphological defects.

关键词： cdse nanowires photoluminescence

Preparation of sodium titanate nanotubes modified by cdse quantum dots and their photovoltaic characteristics

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Science China Chemistry 2008年第10期51卷 976-982页

作者： ZHANG HongMei CHENG Ke JI YanLing LIU XiaoLan LI LinSong ZHANG XingTang DU ZuLiang Key Lab for Special Functional Materials of Ministry of Education Henan UniversityKaifeng 475004China

Sodium titanate nanotubes have been prepared and modified chemically with cdse quantum dots (QDs) using bifunctional modifiers (HS-COOH). Their photovoltaic characteristics have also been studied. The results indicate that the surface photovoltage response of nanotubes extends to the visible light region, and the intensity of surface photovoltage is enhanced after modification with cdse QDs. The field-induced surface photovoltage spectroscopy (FISPS) shows that sodium titanate nanotubes have different photovoltaic response before and after modification. That is, the surface photovoltaic re-sponse of pure sodium titanate nanotubes increases with the enhancement of positive applied bias and decreases with the enhancement of negative applied bias. Meanwhile, the surface photovoltaic re-sponse of cdse modified sodium titanate nanotubes is different from that of the pure sodium titanate nanotubes. The whole spectrum increases with the enhancement of applied bias at the first stage. However, when the applied bias reaches a certain value, the surface photovoltage response keeps in-creasing in some spectrum regions, while decreasing in other spectrum regions. This novel phe-nomenon is explained by using an electric field induced dipole model.

关键词： sodium titanate nanotube cdse surface photovoltage spectroscopy diffusion mechanism drift mechanism