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Preparation and Study of Cuins2 Nanoparticles

Author: ChenXing
Tutor: WuSiXin
School: Henan University
Course: Organic Chemistry
Keywords: Solar Solvothermal CIS CuInS2
CLC: TB383.1
Type: Master's thesis
Year: 2010
Downloads: 322
Quote: 1
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Abstract


CuIn（S/Se）2 （CIS） is one of the most promising solar cells and become significant on each country for its high performances, such as direct and tunable energy band gap, extraordinarily high absorption coefficient, long-term stability, high conversion efficiency, fine anti-interference and good radiation resistance. Generally, grain boundaries （GBs） are known to have high concentrations of defects and impurities that normally enhance recombination and thus adversely affect cell performance.As for the CIS semiconductor material, experiments show that the photoelectric conversion efficiency of polycrystalline thin films is significantly higher than that the system of single-crystal films. The theoretical results also confirmed this point: the interface between the grain interior （GI） and the grain boundary （GB） would lower the valence band maximum at the GB by 400 meV, which makes the holes difficult to move to the grain boundary without affecting the movement of electronic. As a result, electron-hole recombination must be diminished. This is achieved without the mobility-reducing charge defects at the GB. Generally, such behavior has a wide significance for polycrystalline materials and show us a broad application prospect of applications for polycrystalline films.This thesis includes the following sections:1. The compounds acetylacetone copper, acetylacetone indium and thioacetamide served as raw materials. With the influence of surfactant cetyltrimethylammonium bromide （CTAB）, CuInS2 nanoparticles were prepared. The products were detected by transmission electron microscopy （TEM） and X-ray diffraction （XRD）. The results demonstrated that, when we chose dioctylphthalate （DOP） for solvent, the CuInS2 was composed of 2050 nm monodispersed hexagonal nanocrystals. And when we chose o-dichlorobenzene for solvent, the crystal structure of CuInS2 is tetragonal chalcopyrite. The effects of reaction conditions on the synthesis of CIS powder structures and morphology had been studied. The results showed that in the DOP system, temperature and feeding methods had a significant impact on the structure and morphology of the CuInS2, The I-V curves of the samples show their typical semiconductor rectifying behavior.2. With the compounds Copper （Ⅱ） acetate monohydrate （Cu（CH3COO）2?H2O）, indium trichloride （InCl3）, and carbon disulfide （CS2） serving as raw materials, CuInS2 nanoparticles were prepared. The products were detected by XRD and TEM. The results demonstrated that, with the existence of ODA, CuInS2 nanoparticles were prepared in the anisole. At 200℃for 4h, the average size of the CuInS2 particles with irregular shapes was about 20nm. When the temperature dropped to 180℃or lower, the size of the particles turned to be more uniform, and their X-ray diffraction peaks became weaker. At 120℃, a large number of small nanoparticles with uniform size and irregular morphology were obtained. Hexagonal flake nanocrystals which size ranging from 15nm to 50nm were also observed. If extended to 48 hours, the average size of the sample turned to be 30nm. Compared with the 24h-reaction sample, the dispersion of the product became worse. Analysis of the room-temperature UV-vis absorption spectrum of the CuInS2 colloids revealed that the colloids absorb in the visible wavelength range, indicating a potential application as a solar absorber.

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