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    • 5. 发明公开
    • Trench etching using borosilicate glass mask
    • Grabenätzen手套Borosilikatglas-Maske
    • EP0932187A2
    • 1999-07-28
    • EP98309900.3
    • 1998-12-03
    • International Business Machines CorporationSIEMENS AKTIENGESELLSCHAFTKABUSHIKI KAISHA TOSHIBA
    • Ilg, MatthiasKleinhenz, Richard L.Nadahara, SoichiNunez, Ronald W.Penner, KlausRoithner, KlausSrinivasan, RadhikaSugimoto, Shigeki
    • H01L21/308
    • H01L21/3081
    • An improved method for forming semiconductor substrates using BSG avoids the problems associated with conventional TEOS hard mask techniques. The methods comprises providing a semiconductor substrate 1 and applying a conformal layer of borosilicate glass (BSG) 40 on the substrate. A photoresist layer 60 is then formed over the BSG layer and pattern to expose a desired portion of a layer underlying the photoresist layer. Anisotropical etching is then performed through the exposed portion of the underlying layer, through any other layers lying between the photoresist layer and the semiconductor substrate, and into the semiconductor substrate, thereby forming a trench in the semiconductor substrate. Preferably, one or more dielectric layers 10, 20 are present on the substrate surface prior to application of the BSG layer. One or more chemical barrier and/or organic antireflective coating layers 50 may be applied over the BSG layer between the BSG layer and the photoresist layer. The method is especially useful for forming deep trenches in silicon substrates with pad dielectric layers.
    • 使用BSG形成半导体衬底的改进方法避免了与常规TEOS硬掩模技术相关的问题。 所述方法包括提供半导体衬底1并在衬底上施加硼硅酸盐玻璃(BSG)40的共形层。 然后在BSG层和图案上形成光致抗蚀剂层60以暴露光致抗蚀剂层下面的层的期望部分。 然后通过底层的暴露部分,通过位于光致抗蚀剂层和半导体衬底之间的任何其它层,并进入半导体衬底,从而在半导体衬底中形成沟槽,进行非热蚀刻蚀刻。 优选地,在施加BSG层之前,在衬底表面上存在一个或多个电介质层10,20。 可以在BSG层和光致抗蚀剂层之间的BSG层上施加一个或多个化学屏障和/或有机抗反射涂层50。 该方法对于在具有焊盘介电层的硅衬底中形成深沟槽特别有用。