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High order silane composition, and method of forming silicon film using the composition

a technology of composition and silane, which is applied in the direction of silicon compounds, coatings, chemistry apparatus and processes, etc., can solve the problems of poor utilization efficiency of raw materials, large apparatus required, and difficult handling of raw materials, and achieve the effect of easy formation

Inactive Publication Date: 2007-08-16
AOKI TAKASHI +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a high order silane composition that contains a polysilane with higher molecular weight than conventionally available. This composition has improved wettability, boiling point, and safety, and can easily form a high-quality silicon film. The invention also provides a method of forming a silicon film by applying the composition onto a substrate and carrying out heat treatment and / or light treatment. The composition contains a photopolymerizable silane with specific properties, and a solvent with lower boiling point than the silane. The ultraviolet light used for photopolymerization has a specific wavelength and irradiation time. The addition of a substance containing a group 3B or 5B element of the periodic table can further enhance the properties of the silicon film.

Problems solved by technology

However, with this method, there are problems such as a large apparatus being required, the efficiency of usage of the raw material being poor, the raw material being difficult to handle due to being a gas, and a large amount of waste being generated.
However, there is a problem in that the raw material silane is continuously vaporized and cooled, and hence a complicated apparatus is required, and moreover it is difficult to control the film thickness.
However, with these methods, a low-molecular-weight material is used, and hence the system is unstable and handling is problematic.
Moreover, with these methods, the wettability to the substrate of the solution used is poor, and hence the application onto the substrate is intrinsically difficult, and moreover the boiling point is low due to the molecular weight being low, and hence during the heating evaporation occurs more quickly than formation of the silicon film, and thus it is extremely difficult to obtain the desired film.
With this method, it is necessary to mix a catalyst such as nickel into the solution, and hence there is a drawback that the properties of the silicon film are markedly degraded.
Regarding methods of directly synthesizing silane having a high molecular weight, synthesis procedures and refinement methods are both extremely problematic in general; there have been attempts at a method of directly synthesizing polysilane through thermal polymerization as disclosed in Japanese Patent Application Laid-open No. 11-260729, but at best Si9H20 is obtained and at a low yield, and at such a molecular size, the above-mentioned properties such as wettability are still insufficient.
However, with this method as well, there is the fundamental problem for the case of using a low-molecular-weight material that the polysilane solution evaporates during the heating process and hence the amount thereof drops, and accompanying this the dopant source also evaporates, and hence it is difficult to add the dopant effectively.

Method used

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  • High order silane composition, and method of forming silicon film using the composition

Examples

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examples

[0072] Following is a more detailed description of the present invention through examples; however, the present invention is not limited to these examples.

[0073] All of the following examples were carried out under a nitrogen atmosphere with an oxygen concentration of not more than 1 ppm.

examples 1 to 5

[0074] 3 g of cyclohexasilane was dissolved in 10 ml of benzene, thus preparing a solution. The solution was put into a 20 ml glass beaker, was irradiated for 5 minutes with UV light of wavelength 308 nm at 20 mW / cm2 while being stirred, and was then filtered using a 0.5 μm filter, thus obtaining a high order silane composition. The high order silane composition was taken as a coating solution and was applied onto quartz substrates using a spin coating method at 1000 rpm. The substrates onto which the high order silane composition had been applied were then baked under various conditions as shown in Table 1, thus forming a brown amorphous silicon film on the quartz substrates. The results of ESCA measurements (surface composition) and the results of Raman spectroscopy measurements (crystallization rate) on the amorphous silicon films obtained are also shown in Table 1.

TABLE 1Crystalli-BakingSiliconOxygenCarbonzationconditions(%)(%)(%)rate (%)Example 130 min at 100° C.,871205then 1...

examples 6 to 11

[0080] 5 g of cyclopentasilane was dissolved in 20 ml of xylene, thus preparing a solution. The solution was put into a 50 ml glass beaker, and was irradiated with UV light under any of various irradiation conditions as shown in Table 2 while being stirred. Each of the solutions was then filtered using a 0. 5 μm filter to remove insoluble components, whereby high order silane compositions were obtained. Each of the high order silane compositions was taken as a coating solution and was applied onto a quartz substrate using a spin coating method at 1500 rpm. Each of the substrates onto which a high order silane composition had been applied was then heated for 30 minutes at 120° C. while reducing the pressure to 5 Torr to remove the xylene solvent, and was then baked for 10 minutes at 500° C., thus forming a brown amorphous silicon film on the quartz substrate.

[0081] The UV wavelength used, the irradiation time, the irradiation dose, the results of ESCA measurements (surface compositi...

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Abstract

It is an object of the present invention to provide a high order silane composition that contains a polysilane having a higher molecular weight than conventionally, this being from the viewpoints of wettability when applying onto a substrate, boiling point and safety, and hence in particular enables a high-quality silicon film to be formed easily, and also a method of forming an excellent silicon film using the composition. The present invention attains this object by providing a high order silane composition containing a polysilane obtained through photopolymerization by irradiating a solution of a photopolymerizable silane or a photopolymerizable like-liquid silane with ultraviolet light. Moreover, the present invention provides a method of forming a silicon film comprising the step of applying such a high order silane composition onto a substrate.

Description

[0001] This application is a divisional patent application of U.S. Ser. No. 10 / 420,521, filed Apr. 22, 2003 and claims priority to Japanese Application No. 2002-119961 filed Apr. 22, 2002, all of which are incorporated by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to a high order silane composition and a method of forming a silicon film that can be used in particular with integrated circuits, thin film transistors, photoelectric converters, photoreceptors, and soon. Specifically, the present invention relates to a high order silane composition that in particular enables a high-quality silicon film to be formed easily, and a method of forming an excellent silicon film using the composition. [0004] 2. Description of the Related Art [0005] Patterning of silicon thin films (amorphous silicon films, polysilicon films, etc.) used with integrated circuits, thin film transistors, and so on is generally carried out through a p...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08J3/28C01B33/029C01B33/04C08G77/60C09D183/16H01L21/208H01L21/368
CPCC01B33/04C08G77/60H01L21/02628H01L21/02422H01L21/02532C09D183/16C08G77/06
Inventor AOKI, TAKASHIFURUSAWA, MASAHIROMATSUKI, YASUOIWASAWA, HARUOTAKEUCHI, YASUMASA
Owner AOKI TAKASHI
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