Synthesis and Characterization of CuIn1−xGaxSe2 Semiconductor Nanocrystals

In this paper, the synthesis and characterization of CuIn1−xGaxSe2 (0 ≤ x ≤ 1) nanocrystals are reported with the influences of x value on the structural, morphological, and optical properties of the nanocrystals. The X-ray diffraction (XRD) results showed that the nanocrystals were of chalcopyrite...

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Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2020-10, Vol.10 (10), p.2066
Main Authors: Shih, Yu-Tai, Tsai, Yu-Ching, Lin, Der-Yu
Format: Article
Language:English
Subjects:
Absorption spectra
Alternative energy sources
band gap energy
Chalcopyrite
Crystals
CuIn1−xGaxSe2
Energy gap
Lattice parameters
Manufacturing
Morphology
Nanocrystals
Optical properties
Particle size
Photovoltaic cells
Production costs
Quantum dots
R&D
Radiation
Raman spectra
Raman spectroscopy
Research & development
Sensors
Synthesis
Transmission electron microscopy
Vegard’s law
Wavelengths
X-ray diffraction
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description In this paper, the synthesis and characterization of CuIn1−xGaxSe2 (0 ≤ x ≤ 1) nanocrystals are reported with the influences of x value on the structural, morphological, and optical properties of the nanocrystals. The X-ray diffraction (XRD) results showed that the nanocrystals were of chalcopyrite structure with particle size in the range of 11.5–17.4 nm. Their lattice constants decreased with increasing Ga content. Thus, the x value of the CuIn1−xGaxSe2 nanocrystals was estimated by Vegard’s law. Transmission electron microscopy (TEM) analysis revealed that the average particle size of the nanocrystals agreed with the results of XRD. Well-defined lattice fringes were shown in the TEM images. An analysis of the absorption spectra indicated that the band gap energy of these CuIn1−xGaxSe2 nanocrystals was tuned from 1.11 to 1.72 eV by varying the x value from 0 to 1. The Raman spectra indicated that the A1 optical vibrational mode of the nanocrystals gradually shifted to higher wavenumber with increasing x value. A simple theoretical equation for the A1 mode frequency was proposed. The plot of this equation showed the same trend as the experimental data.
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subjects Absorption spectra
Alternative energy sources
band gap energy
Chalcopyrite
Crystals
CuIn1−xGaxSe2
Energy gap
Lattice parameters
Manufacturing
Morphology
Nanocrystals
Optical properties
Particle size
Photovoltaic cells
Production costs
Quantum dots
R&D
Radiation
Raman spectra
Raman spectroscopy
Research & development
Sensors
Synthesis
Transmission electron microscopy
Vegard’s law
Wavelengths
X-ray diffraction
title Synthesis and Characterization of CuIn1−xGaxSe2 Semiconductor Nanocrystals
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