A5001226280- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- Copper-based nanomaterials and applications
- Phase-change materials and chalcogenides
- ZnO doping and properties
- Advanced Semiconductor Detectors and Materials
- Electrocatalysts for Energy Conversion
- Acoustic Wave Resonator Technologies
- Calibration and Measurement Techniques
- Electrochemical Analysis and Applications
- Solar Thermal and Photovoltaic Systems
- Photovoltaic System Optimization Techniques
- Fuel Cells and Related Materials
- Perovskite Materials and Applications
- Gas Sensing Nanomaterials and Sensors
- Semiconductor materials and interfaces
- Metallurgical Processes and Thermodynamics
Helmholtz-Zentrum Berlin für Materialien und Energie
2019-2025
Institut des Matériaux Jean Rouxel
2015-2018
Nantes Université
2015-2018
Center for Research and Advanced Studies of the National Polytechnic Institute
2014-2016
Instituto Politécnico Nacional
2015-2016
Cadmium sulfide (CdS) nanoparticles were synthesized by chemical precipitation method using cadmium chloride (CdCl2), sodium (Na2S) and water as a solvent varying temperatures from 20-80 degrees C. The characterized X-ray diffraction (XRD), Raman spectroscopy, field emission scanning electron microscopy (FE-SEM), energy dispersive spectroscopy (EDS), High-resolution transmission (HR-TEM) UV-Visible spectroscopy. XRD pattern revealed cubic crystal structure for all the CdS nanoparticles....
The article demonstrates how quantitative compositional depth profiles of Cu(In,Ga)(S,Se)<sub>2</sub>layers can be utilized to determine their energy bandgap distribution.
The influence of minimal amounts Ag (0.5–1.4 at%) on elemental distribution and crystalline quality (Ag,Cu)(In,Ga)Se 2 (ACIGSe) absorbers grown by the three‐stage coevaporation without added alkali elements is reported. ratios affect amount to be uniformly incorporated into chalcopyrite absorber open‐circuit voltage ( V OC ) ACIGSe solar cell devices. Ag‐containing deposited at 530 °C achieve a best photoconversion efficiency 18.2%. Due an increased , perform better than their Ag‐free...
Abstract Polycrystalline Cu(In,Ga)Se 2 (CIGSe) thin‐film solar cells exhibit gradual onset in their external quantum efficiency ( EQE ) spectra whose shape can be affected by various CIGSe material properties. Apart from influences on the charge‐carrier collection, a broadening of leads to enhanced radiative losses open‐circuit voltage V oc ). In present work, Gaussian parameters describing cells, represented standard deviation, 𝜎 total , was evaluated study impacts effective band‐gap...
This work presents the validation of a heuristic model, which predicts electrical characteristics CIGSSe thin film solar modules. model is based on four-coefficient equations, used to determine parameters from photovoltaic devices such as open circuit voltage, short current, current at maximum power point and point. The coefficients are obtained numerically by fitting these equations measured datasets related various irradiances module temperatures. These four or predictors per parameter can...
Chalcopyrite Culn(1-x)Ga(x)Se2 (CIGS) nanoparticles were synthesized by mixing copper (I) chloride (CuCl), Indium (III) (InCl3), gallium (GaCl3) and selenium (Se) in oleylamine (OLA) at 260 degrees C for 4 h under nitrogen atmosphere. The Ga/(In+ Ga) ratio was tuned across the entire stoichiometric range from 0 to 1. X-ray diffraction analysis (XRD) revealed chalcopyrite crystal structure samples prepared with x = 0, 0.3, 0.5, 0.7 lattice parameters a c decreased linearly increasing Ga...
Cu2ZnGe(S,Se)4 (CZGSSe) thin films were fabricated by sulfurization of co-evaporated Cu2ZnGeSe4 (CZGSe) films. The goal this work is to investigate the effect composition CZGSe layers on structural, vibrational and morphological properties CZGSSe compounds. Different with different cation's ratios (Cu-poor, Zn-rich; Cu-poor, Zn-stoichiometric Ge-rich) investigated before after process. Break-off cooling experiments during also carried out. revealed that 440 °C key temperature incorporate S...
Cu(In,Ga)Se <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> (CIGSe) particles were synthesised by thermal decomposition method using CuCl, InCl xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> , GaCl and elemental selenium in oleylamine under nitrogen atmosphere. In this work, influence of reaction time on CIGSe particle synthesis was investigated XRD, Raman, FESEM EDAX analysis. Structural analysis showed more Ga incorporation at 4h....
The oxygen reduction reaction (ORR) is of crucial importance in fuel cells and metal-air batteries. However, ORR remains sluggish easily poisoned due to anolyte crossover alkaline using fuels such as methanol, urea, ammonia 1, 2 . Spinels AB x O 4 (A, B - metals) are interesting replacements for platinum/carbon because their relatively high activity tolerance 2, 3 In this work, we investigated mixed transition metal catalysts Ni, Co, Fe, Mn) the ORR. were electrodeposited on carbon cloth...
In order to control the bandgap profile of CIGSe absorbers, several key parameters absorber formation process have been investigated using semi-industrial 30×30 cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> chalcogenization equipment. It was found that degree gallium-indium interdiffusion depends on thermal budget and selenium vapor pressure at utilized high temperature. Additionally, it copper sodium content precursor. As a result,...
The present work deals with the air-annealing effects on In <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Se xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> precursor layers and related CISe based heterojunction solar cell devices. films were grown a modified 3-stage co-evaporation process that enabled oxidation of layer at end first stage. To study role grain boundaries oxidation, prepared high low temperatures. thin film...
Cu <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ZnSnS xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> (CZTS) nanocrystals were synthesized by employing facile one pot thermal decomposition method. In this study, the influence of reaction time (30 min, 1,2,4 and 8 h) on structural, morphological compositional properties CZTS nanocrystal was investigated. Structural analysis showed presence...
An intriguing area in the field of alkali fluoride post-deposition treatment (PDT) on Cu(In,Ga)(S,Se) 2 (CIGSSe) absorbers is effect chalcogen atmosphere absorber’s surface during PDT process. In this work, we focus RbF-PDTs and study i) Se S ii) impact RbF co-evaporation under vibrational chemical properties surface. Using micro-Raman X-ray photoelectron spectroscopy, examine three different processes: (RbF(S)-PDT), (In+RbF(S)-PDT) (In+RbF(Se)-PDT). Our results show that formation a Cu-poor...