On the mechanisms of InGaN electron cooler in InGaN/GaN light-emitting diodes
Demir, H. V.
Optical Society of America
Please cite this item using this persistent URLhttp://hdl.handle.net/11693/26497
Electron overflow limits the quantum efficiency of InGaN/GaN light-emitting diodes. InGaN electron cooler (EC) can be inserted before growing InGaN/GaN multiple quantum wells (MQWs) to reduce electron overflow. However, detailed mechanisms of how the InGaN EC contributes to the efficiency improvement have remained unclear so far. In this work, we theoretically propose and experimentally demonstrate an electron meanfree- path model, which reveals the InGaN EC reduces the electron mean free path in MQWs, increases the electron capture rate and also reduces the valence band barrier heights of the MQWs, in turn promoting the hole transport into MQWs. © 2014 Optical Society of America.
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