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    • 85. 发明授权
    • Thermal processing method and apparatus therefor
    • 热处理方法及其设备
    • US5484484A
    • 1996-01-16
    • US269039
    • 1994-06-30
    • Kenichi YamagaYuichi MikataAkihito Yamamoto
    • Kenichi YamagaYuichi MikataAkihito Yamamoto
    • C23C16/34C23C16/44C23C16/455C23C16/54C23C16/56C23C16/00
    • C23C16/4409C23C16/345C23C16/455C23C16/54C23C16/56
    • An Si.sub.3 N.sub.4 layer is formed on a surface of a wafer, which is an object to be processed, at a high temperature of, for example, 780.degree. C., using a vertical thermal processing apparatus having a reaction tube of a double-wall structure comprising an inner tube and an outer tube in which a predetermined reduced-pressure status is maintained within the reaction tube while a reaction gas comprising, for example, SiH.sub.2 Cl.sub.2 and NH.sub.3 is made to flow from an inner side to an outer side of the inner tube by the action of a first gas supply pipe and first exhaust pipe provided in the thermal processing apparatus. Next, the temperature in the interior of the reaction tube is raised to, for example, 1000.degree. C., a reaction gas comprising, for example, H.sub.2 O vapor and HCl is made to flow from the outer side to the inner side of the inner tube by the action of a second gas supply pipe and second exhaust pipe, and an SiO.sub.2 layer is formed by the oxidation of the surface of the Si.sub.3 N.sub.4 layer formed on the surface of the wafer, under normal-pressure conditions. The use of a combined chamber enables the implementation of film formation and either oxidation or diffusion processing without having to remove the object to be processed from the reaction tube, and thus prevents the intrusion of a natural oxide layer or the incorporation of particles into a thin film structure of, for example, SiO.sub.2 and Si.sub.3 N.sub.4 layers used as a multi-layer insulating film for devices such as DRAMs.
    • 使用具有双壁结构的反应管的垂直热处理装置,在作为被处理物的晶片的表面上,例如在780℃的高温下形成Si 3 N 4层 包括内管和外管,其中在反应管内保持预定的减压状态,同时使包括例如SiH 2 Cl 2和NH 3的反应气体从内管的内侧流到外管 通过设置在热处理装置中的第一气体供给管和第一排气管的作用。 接下来,将反应管内部的温度升高至例如1000℃,由例如H 2 O蒸气和HCl构成的反应气体从内侧的内侧流向内侧 通过第二气体供给管和第二排气管的作用,通过在常压条件下氧化形成在晶片表面上的Si 3 N 4层的表面形成SiO 2层。 使用组合室能够实现成膜和氧化或扩散处理,而不必从反应管中除去待处理的物体,从而防止天然氧化物层的侵入或将颗粒引入薄的 例如用作用于诸如DRAM的器件的多层绝缘膜的SiO 2和Si 3 N 4层的膜结构。