| 摘要 |
Provided is a technology of embedding a recessed section formed on the surface of a subject to be processed, such as a semiconductor wafer (W), especially a fine hole or a trench having a diameter or a width of 100nm or less, only by plasma sputtering, with a metal, especially copper. A film forming step of depositing a small quantity metal film in the recessed section and a diffusion step of moving the deposited metal film toward the bottom section of the recessed section are alternately performed plurality of times. In the film forming step, bias power to be applied to a placing table for supporting the wafer (W) is set so that on the surface of the wafer (W), the deposition rate of the metal deposition generated due to metal particle drawing is substantially balanced with the etching rate of sputter etching generated by plasma. In the diffusion step, the wafer (W) is maintained at a temperature which permits surface diffusion of the metal film deposited in the recessed section to be generated.
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