Kesterites
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Recent papers in Kesterites
We fabricated Cu2ZnSnS4 (CZTS) thin films by electrochemically depositing precursor stacks on Mo-coated glass in a variety of orders: Cu/Sn/Cu/Zn, Cu/Zn/Cu/Sn, Zn/Cu/Sn/Cu, and Sn/Cu/Zn/Cu. Using Raman spectroscopy and X-ray diffraction,... more
Low open circuit voltage (Voc) has been recognized as the number one problem in the current generation of Cu2 ZnSn(Se,S)4 (CZTSSe) solar cells. We report high light intensity and low temperature Suns-Voc measurement in high performance... more
Despite Cu 2 ZnSnS 4 (CZTS) is a potential candidate for solar cell applications, so far, low efficiency values have been reported. In particular, for spray-deposited CZTS, efficiencies lower than 2% are commonly achieved. It is well... more
Single-step electrodeposition synthesis of a Cu2ZnSnSe4 (CZTSe) film on a Mo-coated glass substrate from an acidic electrolyte containing Cu(II), Zn(II), Sn(IV), and Se(IV) species was investigated. The desired CZTSe film as the main... more
In this work, a review about the influence of the growth parameters on the chemical and physical properties of Cu2ZnSnS4 (CZTS) deposited by pneumatic spray pyrolysis technique and its impact on the thin film solar cells is presented and... more
Using vacuum process, we fabricated Cu 2 ZnSnS 4 solar cells with 8.4% efficiency, a number independently certified by an external, accredited laboratory. This is the highest efficiency reported for pure sulfide Cu 2 ZnSnS 4 prepared by... more
Cu2ZnSnS4 (CZTS)is a p type semiconductor, candidate to replace Cu(In,Ga)Se2 as absorber layer in thin film solar cells. The best solar cells based on CZTS present efficiencies up to 6.8%. These results were improved when metallic Zn was... more
Zn-rich Cu2ZnSnSe4 (CZTSe) films were prepared by a two step process. We have varied the Zn/Sn ratio from 1.24 to 1.73 and analyzed the effects of precursor composition and annealing temperature (between 425o C and 550o C) on the... more
We prepared Cu2ZnSnS4 (CZTS) films on Mocoated glass substrates by using electrodeposition in an acidic electrolyte containing Cu, Zn, and Sn species. We examined how the substrate temperature influenced the compositional, structural,... more
The remarkable potential for inexpensive upscale of solution processing technologies is expected to enable chalcogenide-based photovoltaic systems to become more widely adopted to meet worldwide energy needs. Here, we report a thin-film... more
A co-solvent, dimethylsulfoxide (DMSO), is added to the aqueous chemical ‘‘bath’’ deposition (CBD) process used to grow ZnOS buffer layers for thin film Cu2ZnSnSe4 (CZTSe) solar cells. Device performance improves markedly as fill factors... more
A power conversion efficiency record of 10.1% was achieved for kesterite absorbers, using a Cu 2 ZnSn(Se,S) 4 thin-film solar cell made by hydrazine-based solution processing. Key device characteristics were compiled, including light/dark... more
In this work we report the relation between different secondary phases formation and the values of Cu/(Zn+Sn) and Zn/Sn ratios of Cu2ZnSnS4 (CZTS) thin films deposited by pneumatic spray pyrolysis using air as carrier gas. The films were... more
In this study, a novel sequential electrodeposition of Cu-Zn-Sn-Se and Cu-Sn-Se layers was applied for fabrication of a Cu2ZnSnSe4 (CZTSe) thin film. The desired Cu-Zn-Sn-Se/Cu-Sn-Se bilayer was obtained at a selected applied potential... more
In this work, we have studied the geometric structure and electronic and optical properties of Cu2ZnSn(S1-xSex)4 nanocrystals where x = 0, 0.25, 0.50, 0.75, 1.00 by the quantum-chemical calculations within the framework of DFT. For the... more
Admittance spectra and drive-level-capacitance profiles of several high performance Cu2ZnSn(Se,S)4 (CZTSSe) solar cells with bandgap 1.0–1.5 eV are reported. In contrast to the case for Cu(In,Ga)(S,Se)2, the CZTSSe capacitance spectra... more
We report on the device results of thermally evaporated high efficiency Cu2ZnSn(SxSe1-x)4 (CZTSSe) thin film solar cells with power conversion efficiencies of 7.1% (x=1.0) and 7.5% (x=0.34). We have carried out extensive electrical and... more
The solar cell market is dominated by cells based on silicon wafers. However, due to the high materials costs and new concepts such as building-integrated architecture, other technologies have been implemented, some of these being the... more
Cu2ZnSnS4 is a promising semiconductor to be used as absorber in thin film solar cells. In this work, we investigated optical and structural properties of Cu2ZnSnS4 thin films grown by sulphurization of metallic precursors deposited on... more
We present a device characterization study for hydrazine-processed kesterite Cu 2 ZnSnSe, S 4 CZTSSe solar cells with a focus on pinpointing the main loss mechanisms limiting device efficiency. Temperature-dependent study and... more
The structure of the electronic energy levels of a single phase Cu2ZnSnS4 film, as confirmed by Raman Scattering and x-ray diffraction, is investigated through a dependence on the excitation power of the photoluminescence (PL). The... more
Thermally stimulated current has been studied in polycrystalline Cu2ZnSnS4 thin films deposited by pneumatic spray pyrolysis method using various heating rates, in order to gain information about the trapping centers and/or deep levels... more
ABSTRACT In this work, a device model for Cu2ZnSnS4 (CZTS) solar cell with certified world record efficiency is presented. A study of the most important loss mechanisms and its effect on solar cell performance was carried out. The... more
In this work, we present the Raman peak positions of the quaternary pure selenide compound Cu2ZnSnSe4 (CZTSe) and related secondary phases that were grown and studied under the same conditions. A vast discussion about the position of... more