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    • 4. 发明授权
    • Radical oxidation for bitline oxide of SONOS
    • SONOS的位线氧化物的自由基氧化
    • US07232724B1
    • 2007-06-19
    • US11113507
    • 2005-04-25
    • Hidehiko ShiraiwaJoong JeonWeidong Qian
    • Hidehiko ShiraiwaJoong JeonWeidong Qian
    • H01L21/336
    • H01L27/11521H01L27/115
    • Methods are disclosed for fabricating multi-bit SONOS flash memory cells, comprising forming a first dielectric layer and a charge trapping layer over a substrate of a wafer and selectively etching the dielectric and charge trapping layers down to a substrate region to form a bitline opening, then implanting a dopant ion species into the substrate associated with the bitline opening in a bitline region. A radical oxidation process is then used to form a second dielectric layer of a triple layer dielectric-charge trapping-dielectric stack over the charge trapping layer and to fill the bitline opening in the bitline regions of the wafer. Finally, a wordline structure is then formed over the triple layer dielectric-charge trapping-dielectric stack and the bitline regions of the wafer. A multi-bit flash memory array is also disclosed, comprising a bitline region in a substrate, a first dielectric layer overlying the substrate substantially adjacent to and substantially exposing the bitline region, a charge trapping layer overlying the first dielectric layer substantially adjacent to and substantially exposing the bitline region, a bitline oxide isolation structure or layer extending continuously over the bitline region and charge trapping layer, the isolation structure comprising a single dielectric material layer formed by the radical oxidation process, and a conductive wordline overlying the bitline oxide isolation structure or layer.
    • 公开了用于制造多位SONOS闪速存储器单元的方法,包括在晶片的衬底上形成第一介电层和电荷俘获层,并选择性地蚀刻电介质并将陷阱层电荷捕获到衬底区域以形成位线开口, 然后将掺杂剂离子物质注入与位线区域中的位线开口相关联的衬底中。 然后使用自由基氧化工艺在电荷俘获层上形成三层介电电荷俘获 - 电介质堆叠的第二介电层,并填充晶片的位线区域中的位线开口。 最后,在三层介电 - 电荷俘获 - 电介质堆叠和晶片的位线区域之后形成字线结构。 还公开了一种多位闪存阵列,其包括衬底中的位线区域,覆盖衬底的基本上邻近并基本上暴露位线区域的第一电介质层,覆盖第一电介质层的电荷俘获层,其基本上邻近于并且基本上 暴露位线区域,位线氧化物隔离结构或层,其在位线区域和电荷捕获层上连续延伸,所述隔离结构包括通过自由基氧化过程形成的单个电介质材料层,以及覆盖位线氧化物隔离结构的导电字线, 层。