- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Analysis of Cu doping concentration on PbS thin films for the fabrication of solar cell using feasible nebulizer spray pyrolysis
摘要： This report portrays the analysis of Cu doping concentration (%) on PbS thin films prepared by feasible nebulizer spray technique. The doping percentage of Cu was increased from 0% to 8% in steps of 2%. X-ray diffraction study of the films evinces the nature of the films as polycrystalline with simple cubic crystal structure. The calculated crystallite size was varied from 55 to 41 nm on increasing the Cu doping concentration. SEM/AFM studies proclaim that the cubic shaped grains have covered the entire film surface. The shape of grains was amended with respect to the increase in Cu doping concentration. An elevation in band gap from 1.61 eV to 2.10 eV was spotted for the raise in Cu doping concentration from 0% to 6%. The near band edge emission peak at 575 nm was sensed from PL spectra in which the intensity was enhanced. Hall Effect measurement declared the p-type conductivity nature for the prepared PbS films. Resistivity and carrier-concentration values are 0.73×103 Ωcm and 6.04×1013 cm-3 respectively for 6% Cu doped PbS thin films. Efficiency for the solar cell FTO/n-CdS/p-Cu:PbS structure constructed with 6% Cu doped PbS film is about 0.68%.
关键词： X-ray diffraction,PL spectra,Hall Effect measurement,AFM/SEM,Cu doped PbS film
更新于2025-11-21 11:18:25
-
Fabrication and characterization of lead sulfide (PbS) thin film based heterostructure (FTO/CdS/PbS/Ag) solar cell by nebulizer spray method
摘要： This work deals with the study on the key properties of PbS thin films prepared by simple nebulizer spray method. The structural study done by XRD exhibited cubic crystal structure with polycrystalline nature for the deposited PbS films. The obtained crystallite size was varied between 41 to 55 nm for various molar concentrations. The morphology study done by SEM displays uniform distribution of the grains all over the surface of the prepared PbS thin films. The observed band gap value was decreased from 1.8 eV to 1.51 eV for various molar concentrations. The emitted PL intensity was strong at about 580 nm which is related to the near band edge (NBE) emission. Electrical studies performed by Hall Effect measurement confirm the p-type conductivity of prepared films. Resistivity and carrier concentrations are 2.92×103 Ω-cm and 4.83×1013cm-3 respectively for the deposited films. In addition, a heterojunction solar cell of structure FTO/n-CdS/p-PbS/Ag was produced and its conversion efficiency was ~ 0.39%.
关键词： SEM,PbS,Heterojunction device.,Hall Effect,Photoluminescence
更新于2025-11-21 11:18:25
-
Photoelectrochemical Biosensor Based on Co3O4 Nanoenzyme Coupled with PbS Quantum Dots for Hydrogen Peroxide Detection
摘要： A novel kind of hydrogen peroxide (H2O2) photoelectrochemical (PEC) sensor was constructed based on Co3O4 and PbS nanomaterials modified indium tin oxide (ITO) photoelectrode. The Co3O4 nanoparticles, as mimic enzyme of catalase (CAT), can catalyze H2O2 to generate oxygen (O2) in suit. Then the electron acceptor of O2 enhances the cathodic photocurrent of the photoelectrode. The PEC sensor exhibited high sensitivity because of the formation of p-p type heterostructure between PbS and Co3O4 semiconductors. The photocurrent enhancement can be used to detect concentration of H2O2. The calibration plot was linear in the range from 5 to 250 μM and the detection limit was estimated to be 1.2 μM. The results demonstrated the possibility of nanozyme application in PEC biosensors and the substitution of Co3O4 nanozyme for the natural enzyme.
关键词： hydrogen peroxide,PbS,nanozyme,photoelectrochemical biosensor,Co3O4
更新于2025-11-19 16:56:42
-
A high-performance room temperature methanol gas sensor based on alpha-iron oxide/polyaniline/PbS quantum dots nanofilm
摘要： A high-performance room temperature methanol gas sensor based on alpha-iron oxide/polyaniline/lead sulfide quantum dots (α-Fe2O3/PANI/PbS QDs) nanofilm was demonstrated in this paper, among which the α-Fe2O3 was an urchin-shaped hollow microsphere. The sensing film was fabricated on an epoxy substrate with interdigital electrodes via successive ionic layer adsorption and reaction technique. The prepared α-Fe2O3/PANI/PbS QDs nanocomposite was examined by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, scanning election microscopy and Fourier transform infrared spectrum. The methanol sensing performances of the α-Fe2O3/PANI/PbS QDs film sensor were investigated against methanol from 10 to 100 ppm at room temperature. The experimental results indicated that the methanol sensor in this work had an excellent response, outstanding selectivity and good repeatability at room temperature. The underlying sensing mechanism of the α-Fe2O3/PANI/PbS QDs film toward methanol was ascribed to a series of interactions and changes on the surface of thin films, which make their resistance change greatly. Larger surface area and much more active adsorption sites also played an important role.
关键词： Methanol gas sensor,Room temperature,Successive ionic layer adsorption and reaction,Hydrothermal method,α-Fe2O3/PANI/PbS QDs
更新于2025-11-14 17:15:25
-
Colloidal-Quantum-Dot-in-Perovskite Nanowires
摘要： Colloidal quantum dots are materials of interest in infrared detection – a consequence of their near-infrared light harvesting capability, tunable bandgap, and solution-processing. Herein we develop a quantum-dot-in-perovskite-nanowire consisting of PbS quantum dots embedded inside MAPbI3 nanowires. The kinetics of perovskite nanowire growth were tracked. We found that N, N-dimethylformamide induced the formation of perovskite nanowires, and that their growth was accelerated upon PbS quantum dot inclusion. We then used this nanocomposite to fabricate photodetectors that showed a light response from the visible to near infrared region up to 940 nm. Finally, a flexible photodetector was fabricated on a polyethylene terephthalate substrate.
关键词： MAPbI3 nanowires,flexible photodetector,PbS quantum dots
更新于2025-11-14 17:04:02
-
[IEEE 2018 IEEE International Symposium on the Physical and Failure Analysis of Integrated Circuits (IPFA) - Singapore (2018.7.16-2018.7.19)] 2018 IEEE International Symposium on the Physical and Failure Analysis of Integrated Circuits (IPFA) - Elimination of the Hump Current of P-Channel Polycrystalline Silicon Thin-Film Transistor After Positive Bias Stress
摘要： The stability of p-channel low-temperature polycrystalline silicon (LTPS) thin-film transistors (TFTs) under positive bias stress (PBS) is investigated in this paper. Interestingly, it is observed that the transfer curves show different degradation phenomena from the previous reports, i.e., the threshold voltage (Vth) shifts to the negative gate bias direction, and the hump current in the subthreshold region clearly shrinks with the increase of the stress time, and finally disappears under the PBS, which is explained by the creation and accumulation of positive charges in the gate oxide. It is also observed that the hump current in p-channel TFTs is eliminated at a higher temperature and one possible mechanism for the appearance of hump current is proposed.
关键词： thin-film transistors,positive bias stress (PBS),hump current,p-channel
更新于2025-09-23 15:23:52
-
Structural and dielectric properties of prepared PbS and PbTe nanomaterials
摘要： In this work, PbS and PbTe nanomaterials with various morphologies were synthesized by a hydrothermal method. The structural properties were investigated by using X-ray diffraction (XRD) and corresponding scanning electron microscopy together with their EDX analysis. Both the PbS and PbTe nanomaterials possess good polycrystalline structure. The crystallite size, determined from the XRD data, of PbS is 5 nm whereas the corresponding value of PbTe is 2.69 nm. SEM micrographs reveal that the prepared PbS nanomaterial has star-shaped structures, micro-flowers, some cubes, and semi-dendrites, whereas PbTe has semi-flower structures. Additionally, the dielectric properties have been studied in a broad frequency range from 0.1 Hz up to 1 MHz at temperatures from 298–423 K. The real and imaginary parts of the complex dielectric constant ε' and ε'' of PbTe are comparatively higher than those of PbS. Moreover, the dielectric data were analyzed on the basis of the electric modulus.
关键词： electric modulus,PbS,EDX,PbTe,dielectric properties,SEM
更新于2025-09-23 15:23:52
-
ZnO/CdS/PbS nanotube arrays with multi-heterojunctions for efficient visible-light-driven photoelectrochemical hydrogen evolution
摘要： High performance, low cost and sustainable photocatalytic evolution of hydrogen is a promising energy supply alternative for modern society to resolve the depletion crisis of fossil fuel. The design of multi-heterojunction visible-light photocatalysts combined with electrochemical means is considered one of the most attractive options in recent years. In this work, a photoanode composed of top-opened ZnO/CdS/PbS nanotube arrays (ZnO/CdS/PbS ONTs) with multi-heterojunctions was synthesized via a three-step process, i.e. hydrothermal treatment, chemical bath deposition and successive ionic layer adsorption reaction (SILAR). This as-prepared photoanode exhibited remarkable photoelectrochemical activity under visible light irradiation. The photocurrent density and photoelectrochemical hydrogen evolution efficiency of the optimized ZnO/CdS/PbS ONTs reached up to 14.2 mA cm-2 and 5.5 mL cm-2 h-1 at 0.0 V vs. Ag/AgCl, respectively. The efficiency was 3.1 times that of top-closed ZnO/CdS nanotubes (1.8 mL cm-2 h-1). The experimental results suggest that the high photoelectrochemical activity can be ascribed to the inherent advantages of the structural and successive energy level relays design: on the one hand, the top-opened nanotube structure significantly enlarges surface area of the nanostructure, which facilitates efficient light absorption and rapid mass transport; on the other hand, the well-matched band energy edge of the multi-heterojunction interfaces literally build efficient electron highways to deliver electrons to reaction sites and reduce the recombination of photogenerated charge carriers.
关键词： CdS,visible light,multi-heterojunction,ZnO,photoelectrochemical hydrogen evolution,PbS
更新于2025-09-23 15:22:29
-
Four-Terminal Tandem Solar Cell with Dye-Sensitized and PbS Colloidal Quantum Dot based Sub-cells
摘要： In this work, high performance four-terminal solution-processed tandem solar cells were fabricated by using dye-sensitized solar cells (DSSC) as top-cells and lead sulfide (PbS) colloidal quantum dot solar cells (CQDSC) as bottom-cells. For dye-sensitized top-cells, three different dye combinations were used while the titanium dioxide (TiO2) scattering layer was removed to maximize the transmission. For the PbS bottom-cells, quantum dots with different size were compared. Over 12% PCE has been achieved by using XL dye mixture and 890 nm PbS QDs, which shows a significant efficiency enhancement when compared to single DSSC or CQDSC sub-cells.
关键词： dye-sensitized solar cell,quantum dot solar cell,PbS,four-terminal tandem,solution-processed
更新于2025-09-23 15:21:01
-
Phonon-Driven Energy Relaxation in PbS/CdS and PbSe/CdSe Core/Shell Quantum Dots
摘要： We study the impact of the chemical composition on phonon-mediated exciton relaxation in the core/shell quantum dots (QDs), with 1-nm core made of PbX and the monolayer shell made of CdX, where X=S and Se. For this, time-domain non-adiabatic dynamics (NAMD) based on Density Functional Theory (DFT) and Surface Hopping techniques are applied. Simulations reveal twice faster energy relaxation in PbS/CdS than PbSe/CdSe due to dominant couplings to higher-energy optical phonons in structures with sulfur anions. For both QDs, the long-living intermediate states associated with the core-shell interface govern the dynamics. Therefore, a simple exponential model is not appropriate, and the four-state irreversible kinetic model is suggested instead, predicting 0.9 ps and 0.5 ps relaxation rates in PbSe/CdSe and PbS/CdS QDs, respectively. Thus, 2-nm PdSe/CdSe QDs with a single monolayer shell exhibit the phonon-mediated relaxation time sufficient for carrier multiplications to outpace energy dissipation and benefit the solar conversion efficiency.
关键词： Density Functional Theory,phonon-driven energy relaxation,PbSe/CdSe,PbS/CdS,core/shell quantum dots,Surface Hopping techniques,non-adiabatic dynamics
更新于2025-09-23 15:21:01