Method of making doped semiconductor film having uniform impurity concentration on semiconductor substrate and apparatus for making the same

摘要

For providing a doped semiconductor film having a uniform thickness and a uniform impurity concentration on a semiconductor substrate, both a raw gas such as silane and an impurity gas such as phosphine are prepared. Thereafter, the raw gas is introduced into a reaction chamber, while a decomposed impurity gas, that is obtained by means for decomposing the impurity gas, is introduced into the reaction chamber, thereby depositing a doped semiconductor film such as a polysilicon film on the semiconductor substrate. A sub-reaction chamber, a plasma discharge device and a light source are used as the means for decomposing the impurity gas.