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    • 2. 发明专利
    • Silicon carbide semiconductor device and manufacturing method of the same
    • 硅碳化硅半导体器件及其制造方法
    • JP2014110362A
    • 2014-06-12
    • JP2012264901
    • 2012-12-04
    • Mitsubishi Electric Corp三菱電機株式会社
    • OKABE HIROAKINAKANISHI YOSUKEYOSHIDA MOTOITOMINAGA TAKAAKI
    • H01L21/28H01L21/3205H01L21/336H01L21/768H01L23/532H01L29/12H01L29/78
    • H01L2924/0002H01L2924/00
    • PROBLEM TO BE SOLVED: To provide an SiC semiconductor device which inhibits film peeling of a Cu electrode and has a high diffusion prevention effect of Cu on an element structure part; and provide a manufacturing method of the SiC semiconductor device.SOLUTION: A silicon carbide semiconductor device manufacturing method of the present embodiment comprises: (a) a process of forming a barrier metal 13 on a silicon carbide semiconductor element; (b) a process of forming on the barrier metal 13, a Cu electrode 12 in which an end of a contact surface with the barrier metal 13 is retracted behind an end of the barrier metal 13; and (c) a process of performing anisotropic etching on the barrier metal 13 in a vertical direction by using a Cu electrode 12 as a mask. The process (b) is a process of forming the Cu electrode 12 in a manner such that a width of at least a part other than a bottom which contacts the barrier metal 13 becomes wider than a width of the bottom.
    • 要解决的问题:提供一种抑制Cu电极的膜剥离并且对元件结构部分具有高扩散防止效果的SiC半导体器件; 并提供SiC半导体器件的制造方法。本实施例的碳化硅半导体器件制造方法包括:(a)在碳化硅半导体元件上形成阻挡金属13的工艺; (b)在阻挡金属13上形成有与阻挡金属13的接触表面的端部缩回阻挡金属13的端部后方的Cu电极12的工序; 以及(c)通过使用Cu电极12作为掩模在垂直方向上对阻挡金属13进行各向异性蚀刻的工序。 方法(b)是以使得与阻挡金属13接触的底部以外的至少一部分的宽度比底部的宽度变宽的方式形成Cu电极12的工序。
    • 3. 发明专利
    • Wafer manufacturing method and semiconductor device manufacturing method
    • WAFER制造方法和半导体器件制造方法
    • JP2013131588A
    • 2013-07-04
    • JP2011279168
    • 2011-12-21
    • Mitsubishi Electric Corp三菱電機株式会社
    • SUEHIRO YOSHIYUKISAWADA TAKAOMIYAKE HIDETAKAKOSHO TOMOAKINAKANISHI YOSUKE
    • H01L21/304B23H7/02B28D5/04
    • PROBLEM TO BE SOLVED: To provide a wafer manufacturing method which does not require a beveling treatment of a wafer after cutting the wafer out of an ingot thereby to prevent edge chipping and cracks of a thinned wafer.SOLUTION: A wafer manufacturing method comprises forming on an outer periphery of a pillar ingot 1, V-shaped grooves 3 each having a flat part 4 on a bottom. The flat part 4 has a center deviating from a deepest part 31 of the V-shaped groove 3. With this configuration, grooves each asymmetric in a thickness direction of the ingot 1 and salients (cap parts 33) each asymmetric in the thickness direction of the ingot 1 are formed on a lateral face of the ingot 1. The wafer manufacturing method further comprises cutting the ingot 1 at positions corresponding to the flat parts 4 to cut out wafers each having the cap part 33 on a lateral face.
    • 要解决的问题:提供一种在从晶锭切割晶片之后不需要对晶片进行斜面处理的晶片制造方法,从而防止晶片的边缘碎裂和薄片晶片的裂纹。解决方案:晶片制造方法包括形成 柱锭1的外周,在底部具有平坦部分4的V形槽3。 平坦部分4具有偏离V形槽3的最深部分31的中心。利用这种构造,在锭1的厚度方向上各自不对称的槽和在厚度方向上不对称的凸起(帽部33) 晶锭1形成在晶锭1的侧面上。晶片制造方法还包括在对应于平坦部分4的位置处切割锭1,以在侧面上切割每个具有盖部33的晶片。
    • 7. 发明专利
    • Silicon carbide semiconductor device manufacturing method and silicon carbide semiconductor device
    • 硅碳化硅半导体器件制造方法和硅碳化硅半导体器件
    • JP2014116365A
    • 2014-06-26
    • JP2012267503
    • 2012-12-06
    • Mitsubishi Electric Corp三菱電機株式会社
    • NAKANISHI YOSUKEOKABE HIROAKIYOSHIDA MOTOISUGAHARA KAZUYUKITOMINAGA TAKAAKI
    • H01L21/28
    • PROBLEM TO BE SOLVED: To provide a silicon carbide semiconductor device manufacturing method which can suppress increase in the number of manufacturing processes and inhibit deterioration in ohmic characteristics of an alloy layer to a semiconductor substrate.SOLUTION: A silicon carbide semiconductor device manufacturing method comprises: a process of forming a metal layer 30 composed of a first metal on a semiconductor substrate 11 composed of a silicon carbide; a process of forming on the metal layer 30, a metal nitride film 40 obtained by nitriding of a second metal; a process of irradiating laser beams to form an alloy layer 31 of the silicon carbide of the semiconductor substrate 11 and the first metal of the metal layer 30 via the metal nitride film 40; and a process of forming an electrode 20 on the metal nitride film 40.
    • 要解决的问题:提供一种碳化硅半导体器件的制造方法,其可以抑制制造工艺数量的增加并且抑制合金层对半导体衬底的欧姆特性的劣化。解决方案:一种碳化硅半导体器件制造方法,包括: 在由碳化硅构成的半导体基板11上形成由第一金属构成的金属层30的工序; 在金属层30上形成通过氮化第二金属获得的金属氮化物膜40的工艺; 照射激光束的方法,通过金属氮化物膜40形成半导体衬底11的碳化硅的合金层31和金属层30的第一金属; 以及在金属氮化物膜40上形成电极20的工序。