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    • 2. 发明公开
    • Silicon photosensitive element
    • Lichtempfindliches Bauelement aus Silicium
    • EP0709901A1
    • 1996-05-01
    • EP95115547.2
    • 1995-10-02
    • NEC CORPORATION
    • Tatsumi, Toru
    • H01L31/0352H01L31/107H01L31/105
    • H01L31/035254B82Y20/00H01L31/105H01L31/107
    • A groove (4) is formed on the surface of a silicon substrate (1) by way of etching. A silicon device (3) for a driver of a photosensitive element is formed on the surface of the substrate (1) where the groove (4) is not formed. With the groove, a super lattice structure (6) of Si and Si 1-x Ge x is buried to form a photosensing portion (2). The photosensing portion is formed with an avalanche photodiode or a PIN diode. The photosensing portion is formed to have no step with the surface of the substrate. On the other hand, SOI silicon oxide layer is provided on the back side of the substrate to form the structure of SOI substrate. By this, a photo reflection layer (7) of SiO₂ layer is provided below the photosensing portion (2). Thus, a silicon type photosensing element and the silicon device for driver can be formed on a common chip simultaneously for reducing production cost and for improving sensitivity and photo converting efficiency of the photosensing element.
    • 通过蚀刻在硅衬底(1)的表面上形成凹槽(4)。 在没有形成槽(4)的基板(1)的表面上形成用于感光元件的驱动器的硅器件(3)。 利用凹槽,Si和Si1-xGex的超晶格结构(6)被掩埋以形成感光部分(2)。 光敏部分由雪崩光电二极管或PIN二极管形成。 感光部形成为与基板的表面不具有台阶。 另一方面,在衬底的背面设置SOI氧化硅层,形成SOI衬底的结构。 由此,在感光部(2)的下方设置有SiO 2层的光反射层(7)。 因此,可以在公共芯片上同时形成硅型光敏元件和驱动器用硅器件,以降低生产成本并提高光敏元件的灵敏度和光转换效率。