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    • 61. 发明申请
    • ISOLATION WITH OFFSET DEEP WELL IMPLANTS
    • 隔离深度较深的植入物
    • US20120001268A1
    • 2012-01-05
    • US13228998
    • 2011-09-09
    • James W. AdkissonAndres BryantMark D. JaffeAlain Loiseau
    • James W. AdkissonAndres BryantMark D. JaffeAlain Loiseau
    • H01L27/092
    • H01L29/1083H01L21/26513H01L21/823892
    • A method implants impurities into well regions of transistors. The method prepares a first mask over a substrate and performs a first shallow well implant through the first mask to implant first-type impurities to a first depth of the substrate. The first mask is removed and a second mask is prepared over the substrate. The method performs a second shallow well implant through the second mask to implant second-type impurities to the first depth of the substrate and then removes the second mask. A third mask is prepared over the substrate. The third mask has openings smaller than openings in the first mask and the second mask. A first deep well implant is performed through the third mask to implant the first-type impurities to a second depth of the substrate, the second depth of the substrate being greater than the first depth of the substrate. The third mask is removed and a fourth mask is prepared over the substrate, the fourth mask has openings smaller than the openings in the first mask and the second mask. Then, a second deep well implant is performed through the fourth mask to implant the second-type impurities to the second depth of the substrate.
    • 一种方法是将杂质掺入晶体管的阱区。 该方法在衬底上制备第一掩模,并且通过第一掩模执行第一浅阱注入,以将第一类型的杂质注入衬底的第一深度。 去除第一个掩模,并在衬底上制备第二个掩模。 该方法通过第二掩模执行第二浅井注入,以将第二类型杂质植入衬底的第一深度,然后移除第二掩模。 在衬底上制备第三个掩模。 第三掩模具有比第一掩模和第二掩模中的开口小的开口。 通过第三掩模执行第一深孔注入,以将第一类型的杂质注入衬底的第二深度,衬底的第二深度大于衬底的第一深度。 去除第三掩模并在衬底上制备第四掩模,第四掩模具有小于第一掩模和第二掩模中的开口的开口。 然后,通过第四掩模进行第二深孔注入,以将第二类型的杂质植入到衬底的第二深度。
    • 64. 发明申请
    • CMOS IMAGE SENSOR WITH REDUCED DARK CURRENT
    • CMOS图像传感器具有降低的电流
    • US20110008925A1
    • 2011-01-13
    • US12885648
    • 2010-09-20
    • James W. AdkissonRajendran Krishnasamy
    • James W. AdkissonRajendran Krishnasamy
    • H01L31/18
    • H01L27/14603
    • A carbon-containing semiconductor layer is formed on exposed surfaces of a p− doped semiconductor layer abutting sidewalls of a shallow trench. Following formation of a dielectric layer on the carbon-containing semiconductor layer, a surface pinning layer having a p-type doping is formed underneath the carbon-containing semiconductor layer. A shallow trench isolation structure and a photodiode are subsequently formed. Diffusion of defects directly beneath the shallow trench isolation structure, now contained in the carbon-containing semiconductor layer, is suppressed. Further, boron diffusion into the shallow trench isolation structure and into the photodiode is also suppressed by the carbon-containing semiconductor layer, providing reduction in dark current and enhancement of performance of the photodiode.
    • 在邻接浅沟槽的侧壁的p掺杂半导体层的暴露表面上形成含碳半导体层。 在含碳半导体层上形成电介质层之后,在含碳半导体层的下面形成具有p型掺杂的表面钉扎层。 随后形成浅沟槽隔离结构和光电二极管。 现在包含在含碳半导体层中的浅沟槽隔离结构正下方的缺陷的扩散被抑制。 此外,通过含碳半导体层也抑制了进入浅沟槽隔离结构并进入光电二极管的硼,从而提供了暗电流的降低和光电二极管的性能的提高。