Electric discharge generator and power supply device of electric discharge generator

1. An electric discharge generator and a power supply device of electric discharge generator comprising:

a radical gas generation apparatus that generates a radical gas from a source gas using a dielectric barrier discharge;

a process chamber apparatus that is connected to said radical gas generation apparatus, accommodates a target object, and performs, on said target object, a process in which said radical gas is used; and

a power supply device that applies an alternating current voltage to said radical gas generation apparatus, wherein

said process chamber apparatus includes a table on which said target object is placed, said table causing said target object to rotate,

said radical gas generation apparatus includes:

a plurality of discharge cells that cause said dielectric barrier discharge; and

a source gas supply unit that supplies said radical gas generation apparatus with said source gas,

each of said plurality of discharge cells includes:

a first electrode portion including a first electrode member common to all of the plurality of discharge cells;

a second electrode portion that is opposed to said first electrode portion and includes a second electrode member formed only in its respective discharge cell; and

an opening formed in the first electrode portion and connected to the inside of said process chamber and facing said target object placed on said table, said radical gas generated from said source gas using said dielectric barrier discharge being output through said opening, and

said plurality of discharge cells include first discharge cell that is located at a first distance from a rotation center of said target object in a plan view and second discharge cell that is located at a second distance from said rotation center of said target object in a plan view, said first distance is shorter than said second distance,

said power supply device includes a power supply circuit configuration that receives input of one alternating current voltage and controls output of n-phase alternating current voltages, applies each of said n-phase alternating current voltages to corresponding one of said plurality of discharge cells, and variably controls, according to distances of said plurality of discharge cells from said rotation center of said target object in a plan view, amplitudes of said alternating current voltages to be applied to said plurality of discharge cells, where n represents the number of said plurality of discharge cells.

2. The electric discharge generator and the power supply device of electric discharge generator according to claim 1 , wherein

said power supply circuit configuration includes n-phase inverters and n-phase transformers,

each of said n-phase alternating current voltages is applied to corresponding one of said plurality of discharge cells, and

of said plurality of discharge cells, a discharge cell located farther from said rotation center of said target object in a plan view is subjected to application of a higher value of alternating current voltage,

said second discharge cell is applied a higher value of alternating current voltage than said first discharge cell.

3. The electric discharge generator and the power supply device of electric discharge generator according to claim 2 ,

wherein said power supply device detects a direct current divided into different phases and performs a PID control on a pulse width or a pulse cycle of each of said n-phase inverters based on detection results.

4. The electric discharge generator and the power supply device of electric discharge generator according to claim 1 , wherein

each of said plurality of discharge cells further includes a dielectric that faces a discharge space in which said dielectric barrier discharge occurs, and

said dielectric is made of single sapphire or quartz.

5. The electric discharge generator and the power supply device of electric discharge generator according to claim 1 , wherein

said radical gas generation apparatus has an internal gas pressure of 10 to 30 kPa, and

the distance between said first electrode portion and said second electrode portion is set at 0.3 to 3 mm.

6. The electric discharge generator and the power supply device of electric discharge generator according to claim 1 , wherein

said source gas comprises a nitrogen gas,

said radical gas generation apparatus generates, as said radical gas, a nitrogen radical gas from said nitrogen gas, and

said process chamber apparatus forms a nitride film on said target object using said nitrogen radical gas.

7. The electric discharge generator and the power supply device of electric discharge generator according to claim 1 , wherein

said source gas comprises an ozone gas or an oxygen gas,

said radical gas generation apparatus generates, as said radical gas, an oxygen radical gas from said ozone gas or said oxygen gas, and

said process chamber apparatus forms an oxide film on said target object using said oxygen radical gas.

8. The electric discharge generator and the power supply device of electric discharge generator according to claim 1 , wherein

said source gas comprises a hydrogen gas or water vapor,

said radical gas generation apparatus generates, as said radical gas, a hydrogen radical gas or hydroxyl (OH) radical gas from said hydrogen gas or said water vapor, and

said process chamber apparatus forms a metal film with enhanced hydrogen bonding on said target object using said hydrogen radical gas or said OH radical gas.