Patent ID: 7378304

Claim:
A method of manufacturing a thin film transistor using a chemical vapor deposition (CVD) apparatus having a first and second frequency power supply, a susceptor electrode, a high frequency electrode, a first matching box coupled to the high frequency electrode having a first matching circuit includes a tuning condenser having at least two electrodes, wherein one of the two electrodes is the high frequency electrode, a second matching box coupled to the susceptor electrode having a second matching circuit, and a gas inlet, the method comprising: placing a substrate on the susceptor electrode of the CVD apparatus; and applying electric power having a frequency from the first and second frequency power supply to the susceptor electrode and the high frequency electrode, while providing a flow of reaction gas to the substrate via the gas inlet to form an interspacing insulator layer on a semiconductor layer for a thin film transistor on the substrate that maintains insulation between a gate electrode and one of a drain electrode and a source electrode of the thin film transistor, the reaction gas having a mixture gas of monosilane and nitrous oxide, wherein a fraction of the mixture gas of monosilane and nitrous oxide in the flow of reaction gas is between 10% and 50%.