A kind of growth method of large size cui crystal

Abstract

The invention provides a CuI crystal growth method, which belongs to the field of crystal growth in photoelectric functional material technology. The method uses a low-temperature aqueous solution cooling method to grow crystals, using NH4Cl, NH4Br, NH4I, etc. as cosolvents, copper sheets as reducing agents, paraffin oil seals, growth temperature range of 30-60°C, and cooling rate of 0.1-0.5°C / day. The cooling method crystal growth technology adopted in the present invention has the advantages of low growth temperature, low solution viscosity, simple and easy device, and the growth process can be directly observed. The grown CuI crystal has high purity, good uniformity, and large size. The ultrafast scintillation crystal is expected to play an important role in the future measurement of ultra-high count rate electrons, γ-rays and X-rays. It is also used as a semiconductor material for solar cell materials, superconducting materials and photocatalytic materials.

Description

technical field [0001] The invention relates to the field of crystal growth in photoelectric functional material technology, in particular to a growth method of CuI crystal. Background technique [0002] Cuprous iodide (CuI) has three crystal phases of α, β, and γ. Below 350°C, it is a sphalerite structure (γ-CuI). Both ions are tetrahedral coordination. At 350-392°C, it is Wurtzite structure (β-CuI), when the temperature is higher than 392 ℃, it exists as a cubic structure (α-CuI). Among them, the space group of γ-phase CuI is F-43m, which belongs to the cubic crystal system. It is a p-type semiconductor material with a direct energy gap of 3.leV, a large band gap, good diamagnetism and fast ion conductivity. The opposite spin-orbit splitting, transparent in the visible light range, and the resistivity changes with the change of I-concentration can be used as solar cell materials, superconducting materials and photocatalytic materials. In addition, the low-temperature γ-p...

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Problems solved by technology

In 2012, their team proposed a new evaporation method for CuI crystal growth, which is an improvement on the traditional evaporation method, coupled with a temperature-programmed process, and finally obtained CuI crystals with a size of about 1cm, but the growth solvent acetonitrile is toxic and volatile

In 2010, Huang Feng, Lin Zhang and other research groups reported a method of hydrothermally growing CuI crystals. The obtained CuI crystals were light yellow hexagonal crystals with a size of only 15mm×10mm×1mm, but the crystal growth process was also difficult to control.

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