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    • 96. 发明专利
    • Semiconductor memory device and manufacture thereof
    • 半导体存储器件及其制造
    • JPS6126253A
    • 1986-02-05
    • JP14603884
    • 1984-07-16
    • Nippon Telegr & Teleph Corp
    • NAKAJIMA BANMINEGISHI KAZUSHIGEMIURA KENJIMORIE TAKASHISOMATANI SATOFUMI
    • H01L27/10H01L21/822H01L21/8242H01L27/04H01L27/108H01L29/78
    • H01L27/10864H01L27/10876
    • PURPOSE:To enable the reduction in memory cell area by a method wherein a groove-type capacitor is formed over the periphery of a memory cell, and a transfer gate is constructed inside thereof by means of a vertical MOSFET. CONSTITUTION:A laminated film consisting of an N type substrate 5, an Si oxide film 6, an Si nitride film 7, and a pad oxide film 8 is formed in the cell region of a P type Si substrate, and the groove 9 is formed. Next, a boron ion implanted layer 10 is formed at the bottom of the groove 9. Thereafter, the film 6 is removed and a capacitor oxide film 13 is formed on the side surface of the groove 9. In this state, poly Si 14 of low resistivity is deposited only in the groove 9, and a selective oxide film 111 is formed on its surface. Then, an Si oxide film 61 is deposited over the whole surface, and a groove 91 is formed at the center of the island A. An N type semiconductor layer 51 is formed at the bottom of the groove 91, and a gate oxide film 16, a poly Si 142, and an Si oxide film 17 are formed on the side surface of the groove 91; besides, poly Si 143 of low resistance is deposited in the groove 91. The transfer gate part composed of a vertical MOSFET is formed by patterning.
    • 目的:为了通过在存储单元的周围形成槽型电容器的方法来实现存储单元面积的减小,并且通过垂直MOSFET在其内部构成传输栅极。 构成:在P型Si衬底的单元区域中形成由N型衬底5,Si氧化膜6,氮化硅膜7和衬垫氧化膜8组成的层叠膜,并形成沟槽9 。 接下来,在槽9的底部形成硼离子注入层10.之后,除去膜6,在槽9的侧面形成电容器氧化膜13.在这种状态下, 低电阻率仅沉积在槽9中,并且在其表面上形成选择性氧化物膜111。 然后,在整个表面上沉积Si氧化物膜61,并且在岛A的中心形成有槽91.在槽91的底部形成N型半导体层51,并且形成栅极氧化膜16 ,多晶Si 142和Si氧化物膜17形成在槽91的侧表面上; 此外,低电阻的多晶硅143沉积在凹槽91中。由垂直MOSFET构成的传输栅极部分通过图案化形成。