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Guan-Bo Lin,Xiaoguang Zhang,이수민,George Papasouliotis,김종규,E. Fred Schubert,조제희 한국물리학회 2015 Current Applied Physics Vol.15 No.10
Light-emitting diodes (LEDs) with a Mg-doped p-type Ga1-xInxN (0 ≤ x ≤ 0.07) spacer layer located between an undoped GaN spacer layer and the electron blocking layer are investigated. The LEDs are found to have comparable peak efficiency but less efficiency droop when the crystal quality of the p-type Ga1-xInxN spacer layer is well-controlled by lowering the growth temperature and by using a suitable In composition and Mg doping concentration. All LED samples with the p-type spacer layer show a smaller efficiency droop compared to a reference LED having an undoped GaN spacer. Among the sample sets investigated, an optical power enhancement of 12% at 111 A/cm2 is obtained when inserting a 5 nm-thick p-type Ga0.97In0.03N spacer layer. The results support that carrier transport is the key factor in the efficiency droop observed in GaN-based LEDs.
Lin, G.B.,Zhang, X.,Lee, S.M.,Papasouliotis, G.,Kim, J.K.,Schubert, E.F.,Cho, J. Elsevier 2015 Current Applied Physics Vol.15 No.10
Light-emitting diodes (LEDs) with a Mg-doped p-type Ga<SUB>1-x</SUB>In<SUB>x</SUB>N (0 @? x @? 0.07) spacer layer located between an undoped GaN spacer layer and the electron blocking layer are investigated. The LEDs are found to have comparable peak efficiency but less efficiency droop when the crystal quality of the p-type Ga<SUB>1-x</SUB>In<SUB>x</SUB>N spacer layer is well-controlled by lowering the growth temperature and by using a suitable In composition and Mg doping concentration. All LED samples with the p-type spacer layer show a smaller efficiency droop compared to a reference LED having an undoped GaN spacer. Among the sample sets investigated, an optical power enhancement of 12% at 111 A/cm<SUP>2</SUP> is obtained when inserting a 5 nm-thick p-type Ga<SUB>0.97</SUB>In<SUB>0.03</SUB>N spacer layer. The results support that carrier transport is the key factor in the efficiency droop observed in GaN-based LEDs.