Ga In As P layers and Ga As P/（Al） Ga In P laser diodes（LDs） have been grown on Ga As substrates by metalorganic chemical vapor deposition. The Ga In As P layer, which is lattice matched to Ga As, has an intermedi...Ga In As P layers and Ga As P/（Al） Ga In P laser diodes（LDs） have been grown on Ga As substrates by metalorganic chemical vapor deposition. The Ga In As P layer, which is lattice matched to Ga As, has an intermediate band gap between Ga0.5In0.5P and Ga As. The Ga In P/Ga As heterojunction spikes, especially in the valence band,can be suppressed by introducing this thin Ga In As P layer into the heterostructure interface. The 808 nm Ga As P/（Al）Ga In P LDs with Ga In As P intermediate layer show a reduced operating voltage compared to the conventional LDs with abrupt Ga In P/Ga As interface due to the enhanced hole injection. As a result, the power conversion efficiency is improved from 52% to 60% at 350 m W output power. At high current injection, the LD with Ga In As P intermediate layer has higher light power owing to the decreased joule heating.展开更多
基金Project supported by the National Key Basic Research Program of China(No.2013CB632801)
文摘Ga In As P layers and Ga As P/（Al） Ga In P laser diodes（LDs） have been grown on Ga As substrates by metalorganic chemical vapor deposition. The Ga In As P layer, which is lattice matched to Ga As, has an intermediate band gap between Ga0.5In0.5P and Ga As. The Ga In P/Ga As heterojunction spikes, especially in the valence band,can be suppressed by introducing this thin Ga In As P layer into the heterostructure interface. The 808 nm Ga As P/（Al）Ga In P LDs with Ga In As P intermediate layer show a reduced operating voltage compared to the conventional LDs with abrupt Ga In P/Ga As interface due to the enhanced hole injection. As a result, the power conversion efficiency is improved from 52% to 60% at 350 m W output power. At high current injection, the LD with Ga In As P intermediate layer has higher light power owing to the decreased joule heating.
