Methods and system for cooling a reaction effluent gas

A method for cooling a reaction effluent gas, comprising:

• a) feeding a sufficient amount of a cooling gas into a stream of the reaction effluent gas,
• i) wherein the reaction effluent gas is produced by a thermal decomposition of at least one silicon source gas in a reactor,
• ii) wherein the stream of the reaction effluent is traveling in a confined area;
• iii) wherein the cooling gas comprises at least one chemical species that is present in the reaction effluent gas, and
• iv) wherein sufficient amount of the cooling gas is defined based a concentration of the at least one chemical species in the reaction effluent gas;
• b) cooling the reaction effluent gas to a sufficient temperature so that:
• i) the rate of the thermal decomposition of the at least one silicon source gas in the stream of the cooled reaction effluent gas is less than 5 percent, and
• ii) the cooled reaction effluent gas is capable of being handled by a material that is not suitable for handling the reaction effluent gas;
• and
• c) wherein the sufficient temperature is temperature range between about 450 degrees Celsius and about 700 degrees Celsius.