A5062412154- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- Copper-based nanomaterials and applications
- Semiconductor materials and interfaces
- Phase-change materials and chalcogenides
- Advanced Thermoelectric Materials and Devices
- Advanced Semiconductor Detectors and Materials
- Crystal Structures and Properties
- solar cell performance optimization
- Silicon and Solar Cell Technologies
- ZnO doping and properties
- nanoparticles nucleation surface interactions
- Metal Extraction and Bioleaching
- Perovskite Materials and Applications
- Molecular Junctions and Nanostructures
- Solid-state spectroscopy and crystallography
Tallinn University of Technology
2015-2024
Abstract Cu 2 Zn 1– x Cd Sn(Se y S ) 4 monograin powders with different ‐ and ‐values were prepared from binary compounds in the liquid phase of flux material (KI) evacuated quartz ampoules. All materials had uniform composition p‐type conductivity. PL spectra (10 K) as grown Sn(Se) showed one band peak position around 0.85 eV which shifted linearly to lower energy side increasing content. ZnSnS asymmetrical at 1.31 attributed band‐to‐tail recombination. RT Raman ZnSnSe revealed two main...
Abstract This paper provides an overview of the physical vapor technologies used to synthesize Cu 2 ZnSn(S,Se) 4 thin films as absorber layers for photovoltaic applications. Through years, CZT(S,Se) have been fabricated using sequential stacking or co-sputtering precursors well co-evaporation elemental sources, leading high-efficient solar cells. In addition, pulsed laser deposition composite targets and monograin growth by molten salt method were developed alternative methods kesterite...
In this work, the impact of Li and K co-doping on properties Cu2ZnSnS4 (CZTS) monograin powders used as absorber materials in layer (MGL) solar cells was investigated. CZTS were grown liquid phase flux with different LiI-KI ratios by synthesis-growth method. According to Atomic Absorption Spectroscopy, amount host material did not depend molar ratio LiI KI mixtures remined constant at 0.01 at%. However, concentration depended initial mixture increased from at% 1.22 synthesized CZTS. X-ray...
Abstract The power conversion efficiency of Cu 2 ZnSnS 4 (CZTS) solar cells is still limited by deep defects, low minority carrier lifetime and high recombination rates at the CZTS/CdS interface. objective this study was to find an effective method reduce interface CZTS monograin layer cells. A two-step heterojunction formation process applied controlling intermixing Cd in interface, which resulted improved device up 11.7%. Surface analysis x-ray photoelectron spectroscopy confirmed...
The reported results confirm that the positive effect of Ag in (Cu<sub>1−x</sub>Ag<sub>x</sub>)<sub>1.85</sub>(Zn<sub>0.8</sub>Cd<sub>0.2</sub>)<sub>1.1</sub>SnS<sub>4</sub> MGL solar cells appears only at very low concentrations (<italic>x</italic> ≤ 1%).
Relatively fast achievements in the kesterite solar cell technology have been made over last decade, but experimental efficiency is still ∼13%. One proposed reason an inappropriate band alignment with Cu2ZnSnS4 (CZTS) and CdS that results strong interface recombination losses. Results of this work show temperature duration air annealing CZTS/CdS heterojunction are essential for device performance. Soft slightly improved due to elemental intermixing at interface. On other hand, extended...
The aim of this study was to find a heat-treatment procedure for monograin powders using controllable reactive gas phase improve the CZTS(Se) crystal surface effectively working p-n junctions. influence an isothermal treatment in S and SnS2 vapour on parameters layer solar cells is depending initial composition. efficiencies continuously with increasing temperatures absorber materials' post-annealing from 823 973K under constant sulphur pressure 100 Torr. highest values Jsc= 18.4 mA/cm2 Voc=...
Abstract In the present study, recrystallization of polycrystalline SnS in different molten salts CdI 2 , SnCl and KI as flux materials are presented. The growth material produces unique monograin powders usable layer solar cells. XRD Raman analysis revealed that single phase powder can be obtained at 740 °C 500 °C. Long time heating was accompanied by chemical interaction between resulted a mixture CdS Sn S 3 crystals. SEM images showed morphology crystals controlled nature materials:...