Quantum well structures and methods of making the same
First Claim
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1. A method of making a quantum well structure for a light-emitting device comprising the steps of:
- a) in a first phase, depositing a well layer having average composition according to the formula InyGa1-yN from a first phase gas mixture onto a first barrier layer of the formula InxGa1-xN inclusive of x=0, such that y>
x; and
then b) in a second phase, holding said well on said base layer at a temperature of about 550-900°
C. in contact with a second phase gas mixture, said gas mixtures and flow rates of said gas mixtures being selected so as to provide an indium flux during the second phase less than the indium flux during the first phase, said second phase being conducted for a time sufficient to cause said well layer to form indium-rich clusters and indium-poor regions distributed over the horizontal extent of the well layer.
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Abstract
In deposition of a quantum well structure for a light emitting diode, each well layer is formed by a two-phase process. In a first phase, relatively high flux rates of gallium and indium are employed. In the second phase, lower flux rates of gallium and indium are used. The well layer is formed with a composition which varies across the horizontal extent of the layer, and which typically includes clusters of indium-enriched material surrounded by regions of indium-poor material. The resulting structure exhibits enhanced brightness and a narrow, well-defined emission spectrum.
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Citations
18 Claims
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1. A method of making a quantum well structure for a light-emitting device comprising the steps of:
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a) in a first phase, depositing a well layer having average composition according to the formula InyGa1-yN from a first phase gas mixture onto a first barrier layer of the formula InxGa1-xN inclusive of x=0, such that y>
x; and
thenb) in a second phase, holding said well on said base layer at a temperature of about 550-900°
C. in contact with a second phase gas mixture, said gas mixtures and flow rates of said gas mixtures being selected so as to provide an indium flux during the second phase less than the indium flux during the first phase, said second phase being conducted for a time sufficient to cause said well layer to form indium-rich clusters and indium-poor regions distributed over the horizontal extent of the well layer. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of making a quantum well structure for a light emitting device comprising the steps of:
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a) in a first phase, depositing a well layer having average composition according to the formula InyGa1-yN by passing a first phase gas mixture including as components an organogallium compound, an organoindium compound and NH3 over a first barrier layer of the formula InxGa1-xN inclusive of x=0, such that y>
x while maintaining said first barrier layer at about 550-900°
C., whereby each of said components has a first phase flux during said first phase; and
thenb) in a second phase, maintaining said well layer at about 550-900°
C. in said reactor while passing a second phase gas mixture including said components over said surface so as to provide a second-phase flux of said organoindium compound lower than the first phase flux of said organoindium compound and a second phase flux of said organogallium compound lower than the first phase flux of said organogallium compound. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 17, 18)
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16. A method of making a quantum well structure for a light-emitting device comprising the steps of:
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a) in a first phase, depositing a well layer having average composition according to the formula AldIneGafNjAskPl, where d+e+f=1;
0≦
d≦
1;
0<
e<
1;
0≦
f≦
1; and
j+k+l=1, from a first phase gas mixture onto a first barrier layer of the formula AlgInhGaiNmAsnPo, where g+h+i=1;
0≦
g≦
1;
0≦
h≦
1;
0≦
i≦
1; and
m+n+o=1 and e>
h; and
thenb) in a second phase, holding said well on said base layer at a temperature of about 550-900°
C. in contact with a second phase gas mixture, said gas mixtures and flow rates of said gas mixtures being selected so as to provide an indium flux during the second phase less than the indium flux during the first phase, said second phase being conducted for a time sufficient to cause said well layer to form indium-rich clusters and indium-poor regions distributed over the horizontal extent of the well layer.
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Specification