Source: http://www.google.com/patents/US5951774?dq=5920316
Timestamp: 2013-12-12 04:55:34
Document Index: 71019494

Matched Legal Cases: ['art 103', 'art 103', 'art 103', 'art 103', 'art 103', 'art 103', 'art 103', 'art 103', 'art 103', 'art 103', 'art 103', 'art 203', 'art 303', 'art 203']

Patent US5951774 - Cold-wall operated vapor-phase growth system - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Advanced Patent Search | Sign inAdvanced Patent SearchPatentsA vapor-phase growth system able to avoid fluctuation of the heating performance of a heater during repeated growth processes is provided. This system includes a reactor, a substrate holder for holding a substrate, and a heater for heating the substrate held by the holder. The holder and the heater are...http://www.google.com/patents/US5951774?utm_source=gb-gplus-sharePatent US5951774 - Cold-wall operated vapor-phase growth systemPublication numberUS5951774 APublication typeGrantApplication numberUS 08/967,058Publication dateSep 14, 1999Filing dateNov 10, 1997Priority dateJan 27, 1995Fee statusLapsedPublication number08967058, 967058, US 5951774 A, US 5951774A, US-A-5951774, US5951774 A, US5951774AInventorsTohru Aoyama, Seiichi Shishiguchi, Tatsuya SuzukiOriginal AssigneeNec CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (30), Referenced by (12), Classifications (14), Legal Events (5) External Links: USPTO, USPTO Assignment, EspacenetCold-wall operated vapor-phase growth systemUS 5951774 AAbstract A vapor-phase growth system able to avoid fluctuation of the heating performance of a heater during repeated growth processes is provided. This system includes a reactor, a substrate holder for holding a substrate, and a heater for heating the substrate held by the holder. The holder and the heater are placed in an inner space of the reactor. The holder and the substrate held by the holder divide an inner space of the reactor to thereby form a growth chamber in which a thin film is grown during a growth process and a heater chamber in which the heater is placed. The holder has a supporting member on which the substrate is placed. At least a part of the member is made of the same material as that of the thin film. The supporting member is made of a SOI substrate.
The turbo molecular pumps 108 and 109 are connected to the growth chamber 102 and the heater chamber 107, respectively. As a result, the pressures in the chambers 102 and 107 can be reduced to have different vacuum conditions, independently. In this embodiment, the lowest pressures of the both chambers 102 and 107 that can be attained are 10.sup.-10 Torr or less. Since the chambers 102 and 107 are separated, the pressure in the heater chamber 107 can be set lower than that in the growth chamber 102 by two 5 figures or more.
Unlike the conventional vapor-phase growth system of FIG. 1, although the outer part 103a is made of quartz, the inner part 103b is made of single-crystal silicon. The inner part 103b has an approximately circular window at its center to facilitate the transmission of the radiated heat from the underlying heater unit 105 to the wafer 101. The inner diameter D.sub.2 of the inner part 103b is slightly smaller than the diameter D.sub.W of the wafer 101. The wafer 101 is placed onto the inner part 103b to be approximately concentric therewith. When the wafer 101 is placed onto the inner part 103b, the outer, lower peripheral area of the wafer 101 is contacted with the inner, upper peripheral area of the inner part 103b, as clearly shown in FIG. 6. The contact areas of the wafer 101 and the inner part 103b are very narrow.
The outer diameter D.sub.1 of the inner part 103b is considerably larger than the diameter D.sub.W of the wafer 101. Therefore, almost all the upper surface of the inner part 103b is exposed to the growth chamber 102.
For example, for a silicon wafer with a diameter D.sub.W of 150 mm and an orientation flat, the inner part 103b of the susceptor 103 has an outer diameter D.sub.1 of 200 mm, an inner diameter D.sub.2 of 135 mm, and a thickness T of 4 mm.
A single-crystal silicon wafer was introduced into the growth chamber 102. Then, the temperature of this wafer was raised to 650 Si.sub.2 H.sub.6 gas as the reaction gas was supplied to the chamber 102 at ten (10) Standard Cubic Centimeters per Minutes (SCCM) for fifteen (15) minutes to epitaxially grow a single-crystal silicon film on the wafer.
This SOI substrate is horizontally placed in the reactor 112 so that the quartz plate 203bb is exposed to the heater chamber 107 and the silicon layer 203ba is exposed to the growth chamber 102. The inner and outer diameters D.sub.1 and D.sub.2 are the same as those in the first embodiment. The thickness T.sub.1 of the silicon layer 203ba is 10 am, the thickness T.sub.2 of the quartz plate 203bb is 4 mm, and the total thickness T.sub.0 of the part 203b is 4.01 mm.
The inner part 303b is the same in configuration as the inner part 203b of the second embodiment except that a plurality of penetrating holes 113 are formed around the inner edge. The outer diameter D.sub.1 is 200 mm and the inner diameter D.sub.2 is 130 mm. The holes 113, each having a diameter of 4 mm, are arranged at regular intervals on a circle whose diameter D.sub.3 is 140 mm. The central angle Θ of the adjacent two holes 113 is 11.25.degree.. The distance L between the holes 113 and the inner edge of the flat 203c is 5 mm.
In the above first to third embodiments, the wafer has a diameter D.sub.W is 150 mm. However, the invention may have any other diameters such as 200 mm or 300 nm. Also, although the susceptor is made of the outer and inner parts, it may be made of the inner part alone.
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