Patent ID: 7871940

Claim:
An apparatus for providing a silicon nitride layer, comprising: a deposition chamber which can be evacuated via a pumping system, the pumping system being arranged to provide a gas pressure in the deposition chamber during film formation, the pressure being in a range of 0.05 mbar and 0.5 mbar; a number of filaments which are arranged in the deposition chamber, which filaments are coupleable to an exterior electrical power source, and the filaments can be heated to reach a temperature prior to film formation between 1800° C. and 2500° C., by passing a current through the filaments from said exterior electrical power source; and a gas dosage system arranged at a predetermined distance of the filaments for introducing a gas mixture of silane (SiH 4 ) and ammonia (NH 3 ) in the deposition chamber with a flow ratio between 1:50 and 1:9, a distance between the filaments and a substrate being between 2 cm and 5 cm, and a distance between the gas dosage system and the filaments being between 1 cm and 6 cm.