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    • 5. 发明申请
    • Process for fabrication of a ferrocapacitor with a large effective area
    • 具有大面积有效面积的铁电体的制造方法
    • US20050239219A1
    • 2005-10-27
    • US10831957
    • 2004-04-26
    • Bum-Ki Moon
    • Bum-Ki Moon
    • H01L21/00H01L21/02H01L21/8242H01L29/76
    • H01L28/84H01L27/10852H01L28/55H01L28/90
    • In a ferroelectic capacitor including a dielectric ferroelectric element sandwiched between a bottom electrode and top electrode, the bottom electrode is formed with a ridged structure, and the ferroelectric layer is formed over it and on its sides. Thus the dielectric between the top and bottom electrodes includes not just horizontal sections but also non-horizontal sections. The inventive structure thus has a higher effective capacitor area compared to the overall area of the device. This has two advantages. Firstly, it means that the total charge which can be stored in the device is higher. Secondly, it means that damage to the electrodes and the ferroelectric element at their edges regions occupies a lower proportion of the effective area of the device. The ridged structure of the bottom electrode may be due to it being formed over a ridged substructure, or because it is itself selectively etched.
    • 在包含夹在底部电极和顶部电极之间的介质铁电元件的铁电电容器中,底部电极形成为脊状结构,并且铁电层形成在其上并在其侧面。 因此,顶部和底部电极之间的电介质不仅包括水平部分,而且包括非水平部分。 因此,与本装置的总体面积相比,本发明的结构具有更高的有效电容器面积。 这有两个优点。 首先,这意味着可以存储在设备中的总电荷较高。 其次,这意味着电极和铁电元件在其边缘区域的损坏占设备有效面积的较低比例。 底部电极的脊状结构可能是由于其形成在隆起的子结构之上,或者由于其本身被选择性地蚀刻。
    • 7. 发明授权
    • Ferroelectric capacitor devices and a method for compensating for damage to a capacitor caused by etching
    • 铁电电容器装置和用于补偿由蚀刻引起的电容器损坏的方法
    • US07119021B2
    • 2006-10-10
    • US10703870
    • 2003-11-07
    • Bum-Ki Moon
    • Bum-Ki Moon
    • H01L21/302
    • H01L28/56H01L28/75
    • A ferroelectric capacitor in which damage caused by etching exposed faces of a ferroelectric layer of the capacitor is compensated by depositing a seeding layer of ferroelectric material such as PZT on one or more exposed faces of the ferroelectric layer and depositing an electrode layer made of conductive material such as platinum on the seeding layer. An oxygen annealing recovery process is applied to the device. The seeding layer can transform the phase of the damaged surfaces from amorphous to crystalline during the recovery annealing process and, at the same time, provide the damaged surfaces of the ferroelectric layer with missing element(s), for example lead. The oxygen necessary for recovery of the damage may be obtained through the platinum layer from the oxygen atmosphere.
    • 通过在铁电层的一个或多个暴露面上沉积诸如PZT的铁电材料的接种层来补偿由腐蚀电容器的铁电层的暴露面引起的损伤的铁电电容器,并且沉积由导电材料制成的电极层 如接种层上的铂。 将氧退火恢复过程应用于该装置。 接种层可以在恢复退火过程中将受损表面的相位从无定形转变为结晶,并且同时提供具有缺失元件(例如铅)的铁电层的受损表面。 可以通过来自氧气氛的铂层获得回收损伤所必需的氧。