Memory device and method of manufacturing the same, and method of manufacturing semiconductor device

• Main Author: GOSAIN DHARAM PAL,USUI SETSUO,MORI YOSHIFUMI,NAKAGOE MIYAKO,NOGUCHI TAKASHI,NOMOTO KAZUMASA,WESTWATER JONATHAN
• Format: Patent
• Language: Chinese; English
• Published: 03.11.2004
• Edition: 7
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; MANUFACTURE OR TREATMENT THEREOF; NANOSTRUCTURES FORMED BY MANIPULATION OF INDIVIDUAL ATOMS,MOLECULES, OR LIMITED COLLECTIONS OF ATOMS OR MOLECULES ASDISCRETE UNITS; NANOTECHNOLOGY; PERFORMING OPERATIONS; SEMICONDUCTOR DEVICES; TRANSPORTING

用分散的多个微粒子(点)(15a)构成存储区15的同时，使微粒子(15a)的面密度比在隧道绝缘膜(14a)上产生的构造性的孔(针孔)的面密度大。或者使存储区中的微粒子(15a)的个数为5个以上。或者用表面粗糙度大于等于0.1nm小于等于100nm的多晶硅层(13)形成传导区(13c)的同时，使存储区(15)的微粒子(15a)的个数变得比传导区中的晶粒个数多。即便是在隧道绝缘膜(14a)中发生了针孔等的缺陷，存储在一部分的微粒子上的电荷漏泄，存储在不存在缺陷的区域内形成的微粒子上的电荷也不会漏泄。因此，可以长时间地保持信息。 While a storage region 15 is comprised of many dispersed particulates (dots) (15a), the surface density of the particulates (15a) is set to be higher than that of structural holes (pin holes) produced in a tunnel insulating film (14a), or the number of the particulates (15a) in the storage region (15) is set to five or more. While a conduction region (13c) is formed by a polysilicon layer (13) having a surface roughness of 0.1 nm to 100 nm, the number of the particulates (15a) in the storage region (15) is set to be larger than the number of crystal grains in the conduction region (13c). Even when a defect such as a pin hole occurs in the tunnel insulating film (14a) and charges stored in a part of the particulates are leaked, the charges stored in the particulates formed in a region where no defect occurs are not leaked. Thus, information can be held for a long time.