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Synthesis of several metal selenides and tellurides as semiconductor material

A technology of metal selenides and semiconductors, applied in selenium/tellurium compounds, binary selenium/tellurium compounds, chemical instruments and methods, etc., can solve the problem of low product crystallinity, high initial temperature, highly toxic hydrogen selenide, etc. problems, to achieve the effect of stable product quality, simple equipment, and easy control

Inactive Publication Date: 2004-07-28
TSINGHUA UNIV
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  • Application Information

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Problems solved by technology

For example, Holland "Journal of Materials Science" (Journal of Materials Science) 1990, volume 25, page 1159, reported using hydrogen selenide as a selenium source for solid-phase synthesis of selenides at high temperatures, and this method has a higher initial temperature (> 500 ° C) , the hydrogen selenide used is highly toxic; Holland "Materials Research Bulletin" (Materials Research Bulletin) 1995, volume 30, page 1495, reported that selenium was used as selenium source, and selenide was prepared by high-energy ball milling, and its product crystallinity was not high
Journal of American Chemical Society (Journal of American Chemical Society) 1988 110 volume 3046 pages report adopts organometallic raw material to prepare amorphous cadmium selenide under the isolated air environment; Synthesis of cadmium selenide nanorods from selenium, but expensive surfactants are required

Method used

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  • Synthesis of several metal selenides and tellurides as semiconductor material
  • Synthesis of several metal selenides and tellurides as semiconductor material
  • Synthesis of several metal selenides and tellurides as semiconductor material

Examples

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Effect test

Embodiment 1

[0032] Weigh a certain amount of analytically pure silver nitrate, add an appropriate amount of deionized water to dissolve, transfer the clear solution to a stainless steel pressure-resistant reactor, add 1 / 2 molar amount of sodium selenite and hydrazine hydrate in excess of 1 times Reactor, add deionized water to 70% of the total volume, seal the reactor, and react at 100°C for 2 hours. Then cool to room temperature, open the reaction kettle, filter with Buchner funnel, and wash with deionized water to obtain a black powder. The product is identified as silver selenide through X-ray powder diffraction; under the condition that other conditions remain unchanged, after replacing the hydrazine hydrate in the above-mentioned raw materials with sodium borohydride, potassium borohydride, hydroxylamine and hydrazine sulfate, the sodium selenite is replaced with After becoming selenous acid and ammonium selenite, the product is the same; the selenium source is replaced by the corres...

Embodiment 2

[0034] Weigh a certain amount of analytically pure zinc nitrate, add an appropriate amount of deionized water to dissolve, transfer this clear solution to a stainless steel pressure-resistant reactor, add an equimolar amount of sodium selenite and an excess of 3 times hydrazine hydrate to the reactor, add deionized water to 70% of the total volume, sealed the reactor, and reacted at 180° C. for 1 day. Then cool to room temperature, open the reaction kettle, filter with Buchner funnel, and wash with deionized water to obtain a green powder. The product was identified as zinc selenide by X-ray powder diffraction; under other conditions unchanged, the zinc nitrate in the above raw materials was replaced with zinc chloride and zinc sulfate, and the hydrazine hydrate was replaced with sodium borohydride, potassium borohydride, and hydroxylamine , hydrazine sulfate, after replacing sodium selenite with selenous acid and ammonium selenite, the product is the same; replace the seleniu...

Embodiment 3

[0036] Weigh a certain amount of analytically pure cadmium nitrate, add an appropriate amount of deionized water to dissolve, transfer this clear solution to a stainless steel pressure-resistant reactor, add an equimolar amount of sodium selenite and an excess of 3 times hydrazine hydrate to the reactor, add deionized water to 70% of the total volume, sealed the reactor, and reacted at 100°C for 1 day. Then cool to room temperature, open the reaction kettle, filter with Buchner funnel, and wash with deionized water to obtain a black powder. The product was identified as cadmium selenide by X-ray powder diffraction. Under the condition that other conditions remain unchanged, the reaction temperature is controlled at 100°C, 140°C, and 180°C, which can control the preparation of cadmium selenide semiconductor materials from fractal to rod-shaped (see Figure 1-Figure 3 ). The cadmium nitrate in the above raw materials is replaced by cadmium chloride and cadmium sulfate, the hyd...

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Abstract

By using the soluble salt of transition metalz Zn, Cd, Pb, Mn, Co, Ni, Cu, Ag, Sb and Bi, selenious acid or its solutl salt, or antimonous acid or its soluble salt as raw material, and hydrazine hydrate, sodium borohydride, potassium borohydride, hydroxylamine or hydrazine sulfate as reductant, and through hydrothermal reduction reaction at 100-200 deg.c in a sealed container for 2 hr to 5 days, selenides or tellurides of the said metals as semiconductor material may be synthesized. Unlike available synthesis process, which needs high temperature, toxic feedstock and complex technological course, the present invention has the advantages of low-cost material, simple apparatus, easy control, good technological reproducibility, stable product quality, etc.

Description

technical field [0001] The invention relates to a method for preparing selenide and telluride semiconductor materials by adopting the reduction reaction method of high-valence selenium source and tellurium source. Background technique [0002] Selenides and tellurides are a class of important semiconductor materials. Currently, the methods used to synthesize selenides and tellurides all use low-valence selenium or tellurium sources. For example, Holland "Journal of Materials Science" (Journal of Materials Science) 1990, volume 25, page 1159, reported using hydrogen selenide as a selenium source for solid-phase synthesis of selenides at high temperatures, and this method has a higher initial temperature (> 500 ° C) , used hydrogen selenide is highly toxic; Holland "Materials Research Bulletin" (Materials Research Bulletin) 1995 30 volumes 1495 pages report is selenium source with selenium simple substance, high energy ball milling method prepares selenide, and its product ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B19/00C01B19/04H01L21/02
Inventor 李亚栋彭卿董亚杰
Owner TSINGHUA UNIV