Substrate processing apparatus and substrate processing method using the same

Abstract

Substrate processing apparatuses and methods are provided. A substrate processing apparatus includes placing a first substrate on a first stage in a process chamber, placing a second substrate on a second stage in the process chamber, performing a first deposition process on the first substrate, and performing a second deposition process on the second substrate. The performing the first deposition process includes supplying the first substrate with a first gas. The performing the second deposition process includes supplying the second substrate with a second gas. The supplying the first substrate with the first gas includes alternately and repeatedly performing steps of filling a first gas supply unit with the first gas for a first time length, and supplying the first substrate with the first gas for a second time length. The second time length is greater than the first time length.