摘要:
The present invention provides a wafer heating device which can improve uniformity of a temperature distribution within a surface area of a wafer, with a relatively simple structure. A wafer is supported on a susceptor of annular shape. A first heater of disc shape is disposed below the wafer, and a second heater of annular shape is disposed to surround the first heater. Radiation thermometers are arranged at a ceiling portion of a reaction chamber. The first radiation thermometer measures a temperature of a central area of the wafer, the second radiation thermometer measures a temperature of a peripheral area of the wafer, and the third radiation thermometer measures a temperature of the susceptor. The first heater and the second heater are controlled by independent closed loops. When a wafer is set on the susceptor, a power of the second heater is controlled by using a value measured by the second radiation thermometer as a feedback signal. When no wafer is set on the susceptor, the power of the second heater is controlled by using a value measured by the third radiation thermometer as a feedback signal.
摘要:
A method of chemically growing a thin film in a gas phase using a rotary gaseous phase thin film growth apparatus which feeds a material gas by flowing down the gas from above to a surface of a rotating silicon semiconductor substrate to grow a thin film on a surface of said silicon semiconductor substrate in a method of chemically growing a thin film that a thin film-growing reaction is done wherein: monosilane gas is used as an effective component of the material gas to grow the thin film under a reduced pressure of from 2.7×102 to 6.7×103 Pa with the number of rotations of said silicon semiconductor substrate being from 500 to 2000 min−1 and at a reaction temperature of from 600° C. to 800° C.
摘要:
The object of the present invention is to provide a process for manufacturing a product of glassy carbon, having endurance strength to fatigue at elevated temperature, and to thermal fatigue. After curing the material resin in a mold, the cured resin is baked to obtain a glassy carbon piece. The piece is then machined into a predetermined shape. Subsequently, the surface of the piece resulted after machining, is impregnated with the resin. Further, the resin-impregnated piece is baked so as to transform the impregnated resin into glassy carbon.
摘要:
A silicon wafer is mirror-polished until obtaining surface roughness Ra of 0.70-1.00 nm, Rq of 0.80-1.10 nm, or Rt of 4.50-7.00 nm. The resulting wafer is heat-treated at a temperature not lower than 1,200.degree. C. for 30 minutes to 4 hours in a hydrogen gas atmosphere. According to another aspect, a silicon wafer is mirror-polished until obtaining surface roughness values Ra' of 0.08-0.70 nm, rms of 0.10-0.90 nm, and P-V of 0.80-5.80 nm in a square area of 90 .mu.m by 90 .mu.m, and surface roughness values Ra' of 0.13-0.40 nm, rms of 0.18-0.50 nm, and P-V of 1.30-2.50 nm in a square area of 500 nm by 500 nm. The resulting wafer is heat-treated at 1,100.degree.-1,300.degree. C. for 30 minutes to 4 hours in a hydrogen gas atmosphere.
摘要:
A substrate manufacturing method includes steps of preparing a bonded substrate stack formed by bonding a second substrate to a first substrate having an insulator at least on a surface, forming a gettering layer to capture a metal contamination on the surface of the bonded substrate stack to form a composite substrate stack, annealing the composite substrate stack, and removing the gettering layer from the composite substrate stack.