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    • 5. 发明申请
    • INTEGRATED NON-VOLATILE MEMORY AND PERIPHERAL CIRCUITRY FABRICATION
    • 集成的非易失性存储器和外围电路制造
    • WO2008122012A3
    • 2008-11-20
    • PCT/US2008059035
    • 2008-04-01
    • SANDISK CORPKAI JAMESPHAM TUANHIGASHITANI MASAAKIMATAMIS GEORGEORIMOTO TAKASHI
    • KAI JAMESPHAM TUANHIGASHITANI MASAAKIMATAMIS GEORGEORIMOTO TAKASHI
    • H01L21/8247H01L27/105H01L27/115
    • H01L27/11529H01L27/105H01L27/115H01L27/11526H01L27/11536H01L27/11539
    • Non-volatile memory and integrated memory (480) and peripheral circuitry (490) fabrication processes are provided. Sets of charge storage regions (406, 408), such as NAND strings including multiple non- volatile storage elements, are formed over a semiconductor substrate (402) using a layer of charge storage material such as a first layer of polysilicon. An intermediate dielectric layer (404) is provided over the charge storage regions. A layer of conductive material such as a second layer of polysilicon is deposited over the substrate and etched to form the control gates (416, 418) for the charge storage regions and the gate regions (434) of the select transistors for the sets of storage elements. The first layer of polysilicon is removed from a portion of the substrate, facilitating fabrication of the select transistor gate regions from only the second layer of polysilicon. Peripheral circuitry formation is also incorporated into the fabrication process to form the gate regions for devices such as high voltage and logic transistors. The gate regions (444, 448) of these devices can be formed from the layer forming the control gates of the memory array.
    • 提供了非易失性存储器和集成存储器(480)和外围电路(490)制造工艺。 使用诸如第一多晶硅层的电荷存储材料层,在半导体衬底(402)上形成电荷存储区(406,408),诸如包括多个非易失性存储元件的NAND串。 中间电介质层(404)设置在电荷存储区域上方。 将诸如第二多晶硅层的导电材料层沉积在衬底上并被蚀刻以形成用于电荷存储区域的控制栅极(416,418)和用于存储器组的选择晶体管的栅极区域(434) 元素。 从衬底的一部分去除第一层多晶硅,便于仅从第二层多晶硅制造选择晶体管栅极区。 外围电路形成也被并入到制造过程中以形成诸如高电压和逻辑晶体管的器件的栅极区域。 这些器件的栅极区域(444,448)可以由形成存储器阵列的控制栅极的层形成。