METHOD FOR PRODUCING MICROMECHANICAL STRUCTURES HAVING A PROTRUDING LATERAL WALL PROGRESSION OR AN ADJUSTABLE ANGLE OF INCLINATION

摘要

The invention relates to a method for producing micromechanical structures having a raised lateral wall progression or an adjustable angle of inclination. The micromechanical structures are etched out of an SiGe-mixed semiconductor layer (3a, 3b, 30, 30a, 30b, 50) provided on, or deposited on, a silicon semiconductor layer (1, 10), by dry-chemical etching of the SiGe-mixed semiconductor layer (3a, 3b, 30, 30a, 30b, 50). The lateral wall progression of the micromechanical structure is formed by varying the germanium part in the SiGe-mixed semiconductor layer (3a, 3b, 30, 30a, 30b, 50) to be etched. There is a higher germanium part in regions that are to etched more aggressively. The variation of the germanium part in the SiGe-mixed semiconductor layer (3a, 3b, 30, 30a, 30b, 50) is adjusted by a method selected from a group wherein an SiGe-mixed semiconductor layer (3a, 3b, 30, 30a, 30b, 50) having a varying germanium content is deposited, wherein germanium is introduced into a silicon semiconductor layer or an SiGe-mixed semiconductor layer (3a, 3b, 30, 30a, 30b, 50), wherein silicon is introduced into a germanium layer or an SiGe-mixed semiconductor layer (3a, 3b, 30, 30a, 30b, 50), and/or wherein a SiGe-mixed semiconductor layer (3a, 3b, 30, 30a, 30b, 50) is subjected to thermal oxidation.