Abstract:
Embodiments of a method for forming a suspended membrane include depositing a first electrically conductive material above a sacrificial layer and within a boundary trench. The first electrically conductive material forms a corner transition portion above the boundary trench. The method further includes removing a portion of the first electrically conductive material that removes at least a portion of uneven topography of the first electrically conductive material. The method further includes depositing a second electrically conductive material. The second electrically conductive material extends beyond the boundary trench. The method further includes removing the sacrificial layer through etch openings and forming a cavity below the second electrically conductive material. The first electrically conductive material defines a portion of a sidewall boundary of the cavity.
Abstract:
L'Invention se rapporte à un procédé de réalisation d'un composant à partir d'un substrat hétérogène comportant une première et une deuxième parties en au moins un matériau monocristallin, et une couche sacrificielle constituée par au moins un empilement d'au moins une couche de Si monocristallin située entre deux couches de SiGe monocristallin, cet empilement étant disposé entre lesdites première et deuxième partie en matériau monocristallin, caractérisé en ce qu'il consiste à graver ledit empilement en réalisant : e) au moins une ouverture (20) dans la première et/ou la deuxième parties et la première et/ou la deuxième couche de SiGe de façon à déboucher sur la couche de Si, f) une élimination de toute ou partie de la couche de Si.
Abstract:
The invention relates to a method for producing a micromechanical component comprising at least one self-supporting structure. According to said method a conductor track plane (11) and a sacrificial layer (4) consisting of an electrically non-conductive material are applied to a substrate (2) in such a way that the conductor track plane (11) lies between the substrate (2) and the sacrificial layer (4) or inside the sacrificial layer (4), and a layer (3) that forms the self-supporting structure is deposited on the sacrificial layer (4), the latter (4) being partially removed by etching in order to complete the self-supporting structure. An electrically conductive protective layer (15) is embedded in the sacrificial layer (4) above a region on the conductor plane (11) that is to be protected, said protective layer acting as an etching barrier during the etching process for the removal of the sacrificial layer (4). The protective layer (15) is removed again in a subsequent process, leaving a thin sacrificial layer (17) as a passivation layer lying below on the conductor tracks. The method permits sensitive areas of the conductor track plane to be protected and can be simply achieved with existing surface micromechanical processes.