Vapor deposition apparatus

A vapor deposition apparatus, comprising:

• a reaction device having a reaction chamber;
• a first gas duct connected to the reaction chamber and configured to direct a process gas for deposition into the reaction chamber;
• a gas ionization device connected to the reaction device and configured to ionize a cleaning gas;
• a second gas duct connected to the gas ionization device and configured to direct the cleaning gas for cleaning the reaction chamber into the gas ionization device;
• a common gas duct;
• and
• a three-way control mechanism, wherein,
• an end of the common gas duct is connected to the reaction chamber and the other end of the common gas duct is connected to a first gas port of the three-way control mechanism;
• the first gas duct and the gas ionization device are connected to a second gas port and a third gas port of the three-way control mechanism, respectively;
• the three-way control mechanism is configured to control the common gas duct to communicate with the first gas duct or the gas ionization device, or to stop the common gas duct communicating with both the first gas duct and the gas ionization device;
• and
• the three-way control mechanism comprises:
• a first vacuum chamber communicated with the first gas duct;
• a second vacuum chamber communicated with the gas ionization device;
• and
• a switch mechanism switchable between a first state wherein the common gas duct is communicated with the first vacuum chamber or the second vacuum chamber, and a second state wherein the common gas duct is prevented from communicating with both the first vacuum chamber and the second vacuum chamber so that a vacuum isolation is provided between the reaction chamber and the gas ionization device.