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    • 47. 发明授权
    • Method for forming a semiconductor structure having a strained silicon layer
    • 用于形成具有应变硅层的半导体结构的方法
    • US07811382B2
    • 2010-10-12
    • US11421009
    • 2006-05-30
    • Mariam G. SadakaAlexander L. BarrBich-Yen NguyenVoon-Yew TheanTed R. White
    • Mariam G. SadakaAlexander L. BarrBich-Yen NguyenVoon-Yew TheanTed R. White
    • C30B21/02
    • C30B29/52C30B25/02H01L21/0245H01L21/0251H01L21/02532H01L21/0262H01L21/76254
    • A wafer having a silicon layer that is strained is used to form transistors. The silicon layer is formed by first forming a silicon germanium (SiGe) layer of at least 30 percent germanium that has relaxed strain on a donor wafer. A thin silicon layer is epitaxially grown to have tensile strain on the relaxed SiGe layer. The amount tensile strain is related to the germanium concentration. A high temperature oxide (HTO) layer is formed on the thin silicon layer by reacting dichlorosilane and nitrous oxide at a temperature of preferably between 800 and 850 degrees Celsius. A handle wafer is provided with a supporting substrate and an oxide layer that is then bonded to the HTO layer. The HTO layer, being high density, is able to hold the tensile strain of the thin silicon layer. The relaxed SiGe layer is cleaved then etched away to expose the thin silicon layer. A low temperature silicon layer is then epitaxially grown with tensile strain, correlated to the tensile strain of the thin silicon layer, on the thin silicon layer using trisilane at a temperature preferably not in excess of 500 degrees Celsius. The resulting tensile strain, correlated to the strain of the thin silicon layer, is thus also correlated to the germanium concentration of the relaxed SiGe layer. The thickness of the low temperature silicon layer, using the trisilane at low temperature, is significantly greater than what would normally be expected for a silicon layer of that tensile strain.
    • 具有应变的硅层的晶片用于形成晶体管。 通过首先在施主晶片上形成具有松弛应变的至少30%的锗的锗锗(SiGe)层来形成硅层。 外延生长薄硅层以在松弛的SiGe层上具有拉伸应变。 拉伸应变量与锗浓度有关。 优选在800至850摄氏度之间的温度下,通过使二氯硅烷和一氧化二氮反应,在薄硅层上形成高温氧化物(HTO)层。 手柄晶片设置有支撑基板和氧化物层,然后将其结合到HTO层。 高密度的HTO层能够保持薄硅层的拉伸应变。 松弛的SiGe层被切割,然后蚀刻掉以露出薄的硅层。 然后在优选不超过500摄氏度的温度下使用丙硅烷在薄硅层上外延生长与低硅薄层的拉伸应变相关的低温硅层。 因此,与薄硅层的应变相关的所得拉伸应变也与弛豫SiGe层的锗浓度相关。 在低温下使用丙硅烷的低温硅层的厚度明显大于该拉伸应变的硅层通常预期的厚度。
    • 49. 发明申请
    • PLANAR DOUBLE GATE TRANSISTOR STORAGE CELL
    • 平面双门晶体管存储单元
    • US20100027355A1
    • 2010-02-04
    • US11831801
    • 2007-07-31
    • Thuy B. DaoVoon-Yew TheanBruce E. White
    • Thuy B. DaoVoon-Yew TheanBruce E. White
    • G11C7/00H01L29/78H01L21/336
    • H01L29/66833B82Y10/00H01L29/66825H01L29/7881H01L29/792
    • A semiconductor device suitable for use as a storage cell includes a semiconductor body having a top surface and a bottom surface, a top gate dielectric overlying the semiconductor body top surface, an electrically conductive top gate electrode overlying the top gate dielectric, a bottom gate dielectric underlying the semiconductor body bottom surface, an electrically conductive bottom gate electrode underlying the bottom gate dielectric, and a charge trapping layer. The charge trapping layer includes a plurality of shallow charge traps, adjacent the top or bottom surface of the semiconductor body. The charge trapping layer may be of aluminum oxide, silicon nitride, or silicon nanoclusters. The charge trapping layer may located positioned between the bottom gate dielectric and the bottom surface of the semiconductor body.
    • 适合用作存储单元的半导体器件包括具有顶表面和底表面的半导体本体,覆盖半导体本体顶表面的顶栅电介质,覆盖顶栅电介质的导电顶栅电极,底栅电介质 在半导体本体底表面下方,位于底栅电介质底部的导电底栅电极和电荷捕获层。 电荷捕获层包括与半导体本体的顶表面或底表面相邻的多个浅电荷陷阱。 电荷捕获层可以是氧化铝,氮化硅或硅纳米团簇。 电荷捕获层可以位于底栅电介质和半导体本体的底表面之间。