| 摘要 |
The invention relates to the manufacture of semiconductor elements (10), in which manufacturing process a part (50) of a semiconductor body (11) having a silicon substrate (32) from which the semiconductor elements (10) are formed is removed by means of powder blasting. For this purpose, the surface of the semiconductor body (11) is provided with a mask pattern (40). In this manner, for example, discrete diodes (10) are manufactured in a simple and inexpensive way. A drawback of the known method resides in that it results in diodes (10) having non-uniform properties which, in addition, cannot be readily reproduced from batch to batch. In a method in accordance with the invention, the (111) crystal orientation is chosen as the crystal orientation of the substrate (32), and the longitudinal direction (M) of the mask pattern (40) is aligned with respect to the (111) crystal orientation (L) of the substrate (32) in such a manner that the removed part (50) of the semiconductor body (11) has a symmetrical profile when viewed in cross-section. As a result of such a non-random alignment of the mask pattern (40) with respect to the crystal orientation of the substrate (40), semiconductor elements (10) are obtained having excellent, uniform properties. In addition, the result obtained is very well reproducible. The above-mentioned results are obtained by placing the longitudinal direction (M) of the mask pattern (40) at an angle (60) with respect to the (100) or (110) axes of symmetry of the silicon substrate (32) which are projected on the (111) plane, which angle ranges between 20 and 40 degrees plus or minus an integral number of times 60 degrees, and is preferably approximately equal to 30 degrees plus or minus an integral number of times 60 degrees. Aligning is very simple because the substrate (32) is provided with a facet which extends in the (110) plane.
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