Patent ID: 9593434
Date: 2017-03-14
CPC Classifications: C23C,C30B

Claim:
1. A reactor for treating a substrate comprising: a chamber having a top wall defining an upper boundary of said chamber; a substrate carrier mounted for movement within said chamber, said substrate carrier being adapted to hold one or more substrates; and a gas stream generator arranged to deliver a gas stream having substantially uniform velocity but different concentrations of a reactant gas at different locations within said gas stream, said gas stream generator being arranged to direct said gas stream within said chamber toward said substrate carrier; wherein said substrate carrier is mounted for rotational movement about an axis and said gas stream generator is adapted to supply said gas stream with different concentrations of said reactant gas at different radial distances from said axis; wherein said gas stream generator includes a plurality of gas stream inlets spaced apart from one another and different gas sources connected to said gas stream inlets, said gas sources being arranged so that gases supplied through different gas stream inlets have different concentrations of said reactant gas while maintaining substantially constant total gas velocity; wherein at least one of said gas stream inlets includes a reactant gas port and an adjacent carrier gas port each opening into said chamber through said top wall, a carrier gas source of a carrier gas communicating with an interior of said chamber through said carrier gas port, and a reactant gas source of said reactant gas communicating with said interior of said chamber through said reactant gas port, such that, after being introduced into said chamber from the respective port, said reactant gas introduced through said reactant gas port and said carrier gas introduced through said carrier gas port mix within said chamber while flowing towards said substrate carrier; and wherein said gas stream generator includes a structure defining a carrier gas passage and a reactant gas passage, a source of carrier gas communicating with an interior of said chamber through said carrier gas passage so that a carrier gas entering said chamber will pass in a downstream direction through said carrier gas passage, and a source of reactant gas communicating with said interior of said chamber through said reactant gas passage so that said reactant gas entering said chamber will pass in said downstream direction through said reactant gas passage, said carrier gas passage and said reactant gas passage each having a resistance to gas flow in said downstream direction, said resistance of said carrier gas passage increasing progressively in a radially outward direction away from said axis, and said resistance of said reactant gas passage decreasing progressively in said radially outward direction; further including a choke structure comprising a plate, wherein said carrier gas passage is in the form of a carrier gas slot extending through said plate, and said reactant gas passage is in the form of a reactant gas slot extending through said plate, said carrier gas slot and said reactant gas slot each having a width transverse to said radially outward direction, said width of said carrier gas slot decreasing progressively in said radially outward direction, and said width of said reactant gas slot increasing progressively in said radially outward direction.