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    • 5. 发明申请
    • Zener Diode Within a Diode Structure Providing Shunt Protection
    • 二极管内的齐纳二极管提供并联保护
    • US20120167969A1
    • 2012-07-05
    • US13020849
    • 2011-02-04
    • Christopher J. Petti
    • Christopher J. Petti
    • H01L31/02
    • H01L27/1421H01L31/0747H01L31/1892Y02E10/50
    • A structure to provide a Zener diode to avoid shunt formation is disclosed. An undoped or lightly doped monocrystalline thin semiconductor lamina is cleaved from a donor body which is not permanently affixed to a support element. The lamina may be annealed at high temperature to remove damage from a prior implant. At least one aperture is formed through the lamina, either due to flaws in the cleaving process, or intentionally following cleaving. Heavily doped amorphous silicon layers having opposite conductivity types are deposited on opposite faces of the lamina, one forming the emitter and one a base contact to a photovoltaic cell, while the lamina forms the base of the cell. The heavily doped layers contact in the aperture, forming a Zener diode. This Zener diode prevents formation of shunts, and may behave as a bypass diode if the cell is placed under heavy reverse bias, as when one cell in a series string is shaded while the rest of the string is exposed to sun.
    • 公开了提供齐纳二极管以避免分流形成的结构。 未掺杂或轻掺杂的单晶薄半导体层从不永久地固定到支撑元件的施主体断开。 层可以在高温下退火以去除以前的植入物的损伤。 由于切割过程中的缺陷,或者故意在切割之后,至少一个孔通过层形成。 具有相反导电类型的重掺杂非晶硅层沉积在层的相对表面上,一个形成发射极,另一个与光伏电池的基极接触,而薄层形成电池的基极。 重掺杂层在孔中接触,形成齐纳二极管。 该齐纳二极管防止分流器的形成,并且如果电池放置在较强的反向偏压下,则可能表现为旁路二极管,如串联串中的一个电池阴影而串的其余部分暴露在阳光下时。
    • 9. 发明授权
    • Method for reducing dielectric overetch when making contact to conductive features
    • 在与导电特征接触时减小介质过蚀刻的方法
    • US07928007B2
    • 2011-04-19
    • US12363588
    • 2009-01-30
    • Christopher J. Petti
    • Christopher J. Petti
    • H01L21/4763
    • H01L21/768H01L21/76801H01L21/76802H01L21/76829H01L23/5252H01L2924/0002H01L2924/00
    • In a first preferred embodiment of the present invention, conductive features are formed on a first dielectric etch stop layer, and a second dielectric material is deposited over and between the conductive features. A via etch to the conductive features which is selective between the first and second dielectrics will stop on the dielectric etch stop layer, limiting overetch. In a second embodiment, a plurality of conductive features is formed in a subtractive pattern and etch process, filled with a dielectric fill, and then a surface formed coexposing the conductive features and dielectric fill. A dielectric etch stop layer is deposited on the surface, then a third dielectric covers the dielectric etch stop layer. When a contact is etched through the third dielectric, this selective etch stops on the dielectric etch stop layer. A second etch makes contact to the conductive features.
    • 在本发明的第一优选实施例中,导电特征形成在第一电介质蚀刻停止层上,并且第二电介质材料沉积在导电特征之上和之间。 在第一和第二电介质之间选择性的导电特征的通孔蚀刻将停止在电介质蚀刻停止层上,限制过蚀刻。 在第二实施例中,多个导电特征以消减图案和蚀刻工艺形成,填充有电介质填充物,然后形成为与导电特征和电介质填充物共同构成的表面。 电介质蚀刻停止层沉积在表面上,然后第三电介质覆盖电介质蚀刻停止层。 当通过第三电介质蚀刻接触时,该选择性蚀刻停止在电介质蚀刻停止层上。 第二蚀刻与导电特征接触。