Patent ID: 6645885
Filing Date: 2003-11-11
Classification: B82Y,H01L,H01S

Abstract:
A method for fabricating a device that emits light in blue or green wavelengths:i) providing a substrate comprising a surface layer of a group III-nitride, maintaining the substrate at a temperature ranging from 700Â° C. to 850Â° C., and forming a layer of InxGa1âˆ’xN, wherein x ranges from 0 to 0.10, over the substrate; ii) maintaining the substrate at about the temperature of step i), and flowing indium-precursor at a flow rate of less than 100 &mgr;mol/min between 2 and 5 seconds, and N-precursor over the layer of InxGa1âˆ’xN to form quantum dots of InwGa1âˆ’wN, wherein w>0.20; iii) maintaining the substrate at about the temperature of step i), and forming a well layer of InyGa1âˆ’yN, wherein y is greater than x, over the quantum dots; iv) maintaining the substrate at about the temperature of step i), and forming a first cap layer of InzGa1âˆ’zN, wherein z ranges from 0 to 0.10, over the well layer; v) forming a second cap layer of GaN or AlGaN over the first cap layer; thereby obtaining a device that emits light in blue or green wavelengths.