Effect of Hydrogen and Nitrogen Carrier Gas Ratio on the Structural and Optical Properties of AlInGaN Alloy

【摘要】 Undoped AlInGaN epilayers on GaN templates with different hydrogen（H2） and nitrogen（N2） carrier gas ratios（1:8,2:8,and 3:8 as samples 1,2 and 3,respectively） were grown.When the flow ratio of H₂ and N₂ rises from 1:8 to 3:8,an indium composition decrease from 3%to 1.2%is observed while the aluminum content stays constant at any Bow ratio.Due to the quantum-dot-like effect,photoluminescence intensity is enhanced in the sample with the low carrier gas flow ratio of H₂/N₂.However,the potential well caused by indium uneven distribution is nonuniform,which is more severe in the sample with carrier gas flow ratio 1:8.The process of carrier transfer from shallow to deep potential wells would be more difficult to accomplish,resulting in the reduction of the photoluminescence intensity.This is found to be consistent with the carriers’ lifetime with the help of time-resolved photoluminescence.更多还原

【Abstract】 Undoped AlInGaN epilayers on GaN templates with different hydrogen（H2） and nitrogen（N2） carrier gas ratios（1:8,2:8,and 3:8 as samples 1,2 and 3,respectively） were grown.When the flow ratio of H₂ and N₂ rises from 1:8 to 3:8,an indium composition decrease from 3%to 1.2%is observed while the aluminum content stays constant at any Bow ratio.Due to the quantum-dot-like effect,photoluminescence intensity is enhanced in the sample with the low carrier gas flow ratio of H₂/N₂.However,the potential well caused by indium uneven distribution is nonuniform,which is more severe in the sample with carrier gas flow ratio 1:8.The process of carrier transfer from shallow to deep potential wells would be more difficult to accomplish,resulting in the reduction of the photoluminescence intensity.This is found to be consistent with the carriers’ lifetime with the help of time-resolved photoluminescence.更多还原