Apparatus and method for manufacturing a light-emitting device using a neutral particle beam
The present invention relates to an apparatus and method for manufacturing a semiconductor light-emitting device using a neutral particle beam. According to the present invention, since the kinetic energy of the neutral particle beam is provided as a portion of the reaction energy for causing a nitride semiconductor single crystal thin film to be formed on a substrate, and the reaction energy is not provided as heat energy by heating a substrate as in the prior art, the substrate may be treated at a relatively low temperature. Furthermore, elements such as Si, Mg, and the like, which are solid elements required for doping are sprayed onto the substrate from a source which generates solid elements for doping together with the neutral particle beam to achieve high doping efficiency at a lower temperature. According to the present invention, since the substrate is treated at a low temperature, the degradation of the substrate and thin film may be prevented, and the undesired diffusion of the doping elements may be prevented to enable the manufacture of the semiconductor light-emitting device having superior light-emitting properties in a relatively easy manner.
1. A method of forming a nitride semiconductor single crystal thin film which comprises
a step in which a neutral particle beam including nitrogen (N) atom and inert element is emitted from the neutral particle beam source equipped with neutralizing reflector and using the electron cyclotron resonance (ECR) plasma generating system; and
a step in which solid element III is emitted just before or after the neutral particle beam reaches the substrate, such that a nitride semiconductor single-crystal thin film is deposited on the substrate by the neutral particle beam and the solid element III
wherein the temperature of the substrate is maintained between 200° C. and 800° C.; and
wherein the kinetic energy of the neutral particle beam is between 10 eV and 30 eV.
2. In claim 1 , the method of forming a nitride semiconductor single crystal thin film further comprising
a step in which a solid element for doping is emitted without precursor gas injection onto the nitride semiconductor single-crystal thin films, simultaneously with the step of the solid element III emission.
3. In claim 1 , the method of forming a nitride semiconductor single-crystal thin film
wherein the inert element can be one of Ar, He, Ne, Kr, and Xe or a mixture of two or more of these elements,
wherein the said solid elements III can be one of Al, Ga or In, or a mixture of two or more of these elements.
4. In claim 1 , the method of forming a nitride semiconductor single-crystal thin film in which the solid element III emitting step comprises a modulation mode that emitting on and off operations are periodically repeated.
5. In claim 4 , the method of forming a nitride semiconductor single-crystal thin film in which a ratio of emission on time τ on and emission off time τ off satisfies
τ
off
τ
on
≥
Γ
III
γΓ
n
-
1.
Here, τ m is a flux of solid element III (atoms/cm 2 s), Γ n is a neutral particle beam flux, γ is a ratio of nitrogen atom in the neutral particle beam, τ on is the emission on time and τ off is emission off time.
6. In claim 4 , the method of forming a nitride semiconductor single-crystal thin film in which each on-and-off cycle of the emission of solid element III and the emission of doping solid elements is synchronized and repeated periodically.
7. In claim 4 , the method of forming a nitride semiconductor single-crystal thin film in which each on-and-off cycle of the emission of solid element III and the emission of doping solid element is alternatively asynchronous and repeated periodically.