Material construction for enhancing optical property and temperature stability of self-organizing quantum point

Abstract

Disclosed is a material structure which is capable of improving optical temperature stability of self-organized quantum dots. The material structure comprises a substrate; a cushioning layer is arranged on the substrate to conceal the defect of the substrate so as to make the growth surface plane; a quantum well layer is arranged on the cushioning layer to generate stress relaxation during the growth and guides the stress relaxation to the quantum dot layer above so as to reduce the thickness of the wetting layer; a barrier layer is arranged on the quantum dot layer and is capable of restricting the current carrier in the quantum dot layer to avoid the weakening of optical temperature stability of the quantum dot material caused by thermally excited transition; a quantum dot layer is arranged on the barrier layer and generates electron hole pairs and radiates composite light when being excited; a cover layer is arranged on the quantum dot layer and is used to change the optical property of the quantum dots and to increase the level spacing between the ground state and the excited state.

Description

technical field [0001] The invention belongs to the technical field of semiconductor materials, in particular to a material structure for improving the temperature stability of the optical properties of self-organized quantum dots. Background technique [0002] Self-organized quantum dots show attractive application prospects in optoelectronic devices, such as lasers, detectors, and optical storage. Theoretical prediction: Compared with semiconductor quantum well lasers, semiconductor lasers using quantum dots as active regions will have extremely low threshold current, high characteristic temperature, high differential gain and extremely narrow spectral linewidth. However, so far, the operating properties of semiconductor quantum dot lasers at room temperature are far from the level expected by theory. The temperature stability of quantum dot optical properties is crucial to realize the room temperature operation of quantum dot lasers. In order to make quantum dot material...

AI Technical Summary

Problems solved by technology

The disadvantage of this structure is that the effect of improving the temperature stability of optical properties by increasing the barrier height is limited. Once the temperature exceeds the critical temperature at which carriers can transition to the barrier, the temperature stability will drop significantly.

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