Patent ID: 7977222

Claim:
A manufacturing method of a semiconductor device, comprising: performing a first ion doping into a first semiconductor layer in an ion doping apparatus having an electron generating means, with a state in which temperature of the electron generating means is a first temperature and a first material gas is made into plasma; supplying hydrogen or a rare gas as well as stopping supply of the first material gas, after the first ion doping is completed; decreasing the temperature of the electron generating means from the first temperature to a second temperature, after the hydrogen or rare gas is kept to be supplied; supplying a second material gas as well as stopping supply of the hydrogen or rare gas, and increasing the temperature of the electron generating means from the second temperature to a third temperature, after the temperature of the electron generating means reaches the second temperature; and performing a second ion doping into a second semiconductor layer which is different from the first semiconductor layer, with a state in which the temperature of the electron generating means is the third temperature and the second material gas is made into plasma, wherein the third temperature is a temperature between the first temperature and the second temperature.