Light-emitting diode with composite polar face electron blocking layer

Abstract

The invention discloses a light-emitting diode with a composite polar face electron blocking layer. The light-emitting diode comprises a substrate (101), a metal polar face n-type nitride layer (102), a metal polar face multiple quantum well layer (103), a metal polar face p-type nitride layer (104), a composite polar face p-type electron blocking layer (105) composed of a metal polar face p-type electron blocking layer (1051) and a nitrogen polar face p-type electron blocking layer (1052), a nitrogen polar face p-type nitride layer (106), an n electrode (7) arranged on the metal polar face n-type nitride layer and a p electrode (8) arranged on the nitrogen polar face p-type nitride layer, and the layers and the electrodes are arranged sequentially from bottom to top. A high electronic barrier is formed on a conduction band by the composite polar face electron blocking layer and blocks electrons from crossing a multiple quantum well active region to enter a p-type region, leakage currents can be reduced, and the probability of radiative recombination of the electrons and holes is improved.

Description

technical field [0001] The invention provides a light-emitting diode (LED) with a composite polar surface electron blocking layer, which belongs to the field of manufacturing semiconductor optoelectronic materials and devices. Background technique [0002] LED has attracted much attention due to its advantages of high efficiency, energy saving, small size, and long life, and has begun to gradually replace traditional lighting methods such as fluorescent lamps and incandescent lamps. However, the rapid decline of the internal quantum efficiency of LEDs under the condition of high current injection seriously restricts the application and development of LEDs, and the leakage current is considered to be a main factor leading to the decline of LED efficiency under the condition of high current density. Therefore, reducing the leakage current is very important for improving the luminous efficiency of the LED. [0003] Since electrons have a smaller effective mass and higher mobil...

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Problems solved by technology

Although these electron blocking layers have many advantages, they still cannot satisfactorily solve the following technical problems: 1) the more obvious the effect of the p-type electron blocking layer on electron blocking, the greater the drop in hole injection efficiency; The lattice mismatch between the p-type nitride layer and the multi-quantum well active region is relatively large, which is easy to cause defects; 3) the distribution of carriers in the quantum wells is still not uniform, resulting in the generation of carriers in LED devices. Recombination efficiency and luminous efficiency are still low

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