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    • 62. 发明申请
    • Sensor element with trenched cavity
    • 带沟槽的传感器元件
    • US20060057816A1
    • 2006-03-16
    • US11223592
    • 2005-09-08
    • Hubert BenzelStefan FinkbeinerMatthias IllingFrank SchaeferSimon ArmbrusterGerhard LammelChristoph SchellingJoerg Brasas
    • Hubert BenzelStefan FinkbeinerMatthias IllingFrank SchaeferSimon ArmbrusterGerhard LammelChristoph SchellingJoerg Brasas
    • H01L21/76
    • G01L9/0045B81B2203/0315B81C1/00182G01P15/0802
    • A micromechanical sensor element and a method for the production of a micromechanical sensor element that is suitable, for example in a micromechanical component, for detecting a physical quantity. Provision is made for the sensor element to include a substrate, an access hole and a buried cavity, at least one of the access holes and the cavity being produced in the substrate by a trench etching and/or, in particular, an isotropic etching process. The trench etching process includes different trenching (trench etching) steps which may be divided into a first phase and a second phase. Thus, in the first phase, at least one first trenching step is carried out in which, in a predeterminable first time period, material is etched out of the substrate and a depression is produced. In that trenching step, a typical concavity is produced in the wall of the depression. A passivation process is then carried out in that first phase, in which the concavity produced in the walls of the depression by the first trenching step is covered with a passivation material. The first trenching step and the first passivation process may be carried out repeatedly in alternating succession within the first phase, with the result that a typical corrugation is obtained on the walls of the depression so produced. In the second phase of the trench etching process, the cavity is produced through the at least one access hole produced by the depression, by carrying out a second trenching step of a predetermined second time period that is distinctly longer in comparison with the first time period.
    • 微机械传感器元件和用于生产微机械传感器元件的方法,其适用于例如微机械部件中,用于检测物理量。 为传感器元件提供包括基板,进入孔和埋入空腔的设置,通过沟槽蚀刻和/或特别地,各向同性蚀刻工艺在基板中产生至少一个访问孔和空腔 。 沟槽蚀刻工艺包括可分为第一相和第二相的不同的开沟(沟槽蚀刻)步骤。 因此,在第一阶段中,执行至少一个第一开沟步骤,其中在可预定的第一时间段内将材料从衬底中蚀刻出来并产生凹陷。 在挖沟步骤中,在凹陷的壁上产生典型的凹陷。 然后在第一阶段进行钝化处理,其中通过第一开挖步骤在凹陷的壁中产生的凹陷被钝化材料覆盖。 第一开沟步骤和第一钝化工艺可以在第一阶段内连续交替重复进行,结果是在如此制造的凹陷的壁上获得典型的波纹。 在沟槽蚀刻工艺的第二阶段,通过执行与第一时间段相比明显更长的预定第二时间段的第二开沟步骤,通过由凹陷产生的至少一个访问孔产生空腔 。