Importance

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Abstract

A method of manufacturing a semiconductor device includes forming an etching mask over a semiconductor body, forming a plurality of trenches in the semiconductor body to define a plurality of protruding semiconductor portions between adjacent trenches, and forming a protection layer in contact with a semiconductor material of the protruding semiconductor portions. The method further includes performing a wet etching step to remove portions of the etching mask and, thereafter, treating the semiconductor body with a mixture of hydrofluoric acid and ethylene glycol and bringing the semiconductor material of sidewalls of the plurality of protruding semiconductor portions into contact with the mixture of hydrofluoric acid and ethylene glycol.

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First Claim