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    • 52. 发明申请
    • REPLACEMENT METAL GATE TRANSISTORS WITH REDUCED GATE OXIDE LEAKAGE
    • 更换具有减少栅极氧化物泄漏的金属栅极晶体管
    • WO2007056093A2
    • 2007-05-18
    • PCT/US2006042870
    • 2006-11-02
    • ADVANCED MICRO DEVICES INCPAN JAMESPELLERIN JOHN
    • PAN JAMESPELLERIN JOHN
    • H01L21/28008H01L21/28088H01L21/28238H01L29/495H01L29/4966H01L29/513H01L29/517H01L29/66545
    • Thin effective gate oxide thickness with reduced leakage for replacement metal gate transistors is achieved by forming a protective layer (70) between the gate oxide layer (12) and metal gate electrode (60), thereby reducing stress. Embodiments include forming a protective layer of amorphous carbon (70) containing metal carbides decreasing in concentration from the metal gate electrode (60) toward the gate oxide layer (12) across the protective layer. Embodiments of methodology include removing the removable gate, depositing a layer of amorphous carbon on the gate oxide layer, forming the metal gate electrode (60) and then heating at an elevated temperature to diffuse metal from the metal gate electrode into the amorphous carbon layer (70), thereby forming the metal carbides. Embodiments also include metal gate transistors with a gate oxide layer (82) having a high dielectric constant and silicon concentrated at the interfaces with the metal gate electrode (100) and substrate (10).
    • 通过在栅极氧化物层(12)和金属栅电极(60)之间形成保护层(70)来实现用于替换金属栅极晶体管的具有减小的泄漏的薄的有效栅极氧化物厚度,从而减小应力。 实施例包括:形成非金属碳(70)的保护层,该保护层含有金属碳化物,金属碳化物的浓度从金属栅电极(60)朝向栅极氧化物层(12)跨越保护层。 方法的实施例包括去除可移除栅极,在栅极氧化物层上沉积无定形碳层,形成金属栅电极(60),然后在高温下加热以使金属从金属栅电极扩散到无定形碳层( 70),从而形成金属碳化物。 实施例还包括具有高介电常数的栅极氧化物层(82)和在与金属栅电极(100)和衬底(10)的界面处集中的硅的金属栅极晶体管。