Lens structures suitable for use in image sensors and method for making the same
    9.
    发明授权
    Lens structures suitable for use in image sensors and method for making the same 有权
    适用于图像传感器的镜头结构及其制作方法

    公开(公告)号:US07443005B2

    公开(公告)日:2008-10-28

    申请号:US10982978

    申请日:2004-11-05

    IPC分类号: H01L29/78

    摘要: An image sensor includes a double-microlens structure with an outer microlens aligned over an inner microlens, both microlenses aligned over a corresponding photosensor. The inner or outer microlens may be formed by a silylation process in which a reactive portion of a photoresist material reacts with a silicon-containing agent. The inner or outer microlens may be formed by step etching of a dielectric material, the step etching process including a series of alternating etch steps including an anisotropic etching step and an etching step that causes patterned photoresist to laterally recede. Subsequent isotropic etching processes may be used to smooth the etched step structure and form a smooth lens. A thermally stable and photosensitive polymeric/organic material may also be used to form permanent inner or outer lenses. The photosensitive material is coated then patterned using photolithography, reflowed, then cured to form a permanent lens structure.

    摘要翻译: 图像传感器包括双微透镜结构,其外部微透镜在内部微透镜上对准,两个微透镜在相应的光电传感器上对准。 内部或外部微透镜可以通过甲硅烷基化方法形成,其中光致抗蚀剂材料的反应性部分与含硅试剂反应。 内部或外部微透镜可以通过介电材料的步骤蚀刻形成,该步骤蚀刻工艺包括一系列交替蚀刻步骤,其包括各向异性蚀刻步骤和使图案化光致抗蚀剂横向后退的蚀刻步骤。 可以使用随后的各向同性蚀刻工艺来平滑蚀刻的台阶结构并形成光滑的透镜。 热稳定和感光的聚合物/有机材料也可用于形成永久的内镜片或外镜片。 感光材料被涂覆,然后使用光刻图案化,回流,然后固化以形成永久性透镜结构。