ZnO Quantum Well Light Emitter Structure for Defect-Free Emission
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Solution Overview
Problem
Existing light emitting elements face challenges in achieving high emission efficiency due to factors such as cracks and pin-holes formed during the fabrication process, which affect the performance and reliability of the devices.
Innovation Solution
A light emitting element structure comprising an N-type semiconductor layer with zinc oxide, a P-type semiconductor layer with GaN, and an active layer with a quantum well structure using zinc oxide and GaN materials, where the N-type and P-type semiconductor layers share the same material, and the active layer includes mixed layers formed by mixing zinc oxide and GaN to prevent lattice mismatch and strain, thereby enhancing light efficiency and preventing fabrication defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fabrication processes are used to manufacture light emitting elements, then production can be maintained, but cracks and pin-holes are formed in layers reducing emission efficiency
Solution Approach 1:
The patent changes the material parameters by using zinc oxide semiconductor with controlled oxygen vacancies and specific doping concentrations, and adjusts the bandgap parameters through quantum well design to achieve high emission efficiency while preventing defects during fabrication
Solution Approach 2:
The patent employs composite material structures including zinc oxide semiconductor layers combined with dopants, quantum well structures with barrier and well layers, and mixed layers integrating different semiconductor materials to achieve both high emission efficiency and defect prevention
2Reliability
If mixed layers are formed by mixing zinc oxide and GaN materials, then lattice mismatch and strain are prevented, but device complexity increases
Solution Approach 1:
The patent introduces mixed layers as intermediary structures between different semiconductor materials, where zinc oxide and GaN are mixed to create transition layers that gradually bridge the lattice mismatch and reduce strain accumulation across interfaces
Solution Approach 2:
The patent applies local quality by creating mixed layers with specific spatial distributions of zinc oxide and GaN materials at critical interfaces, while maintaining pure material regions in other areas, thereby preventing strain locally without requiring complete structural redesign
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed structure improves light emission efficiency by minimizing strain and preventing defects like cracks and pin-holes, resulting in enhanced performance and reliability of the light emitting elements.
Implementation Method 1
Light may be emitted from the active layer by recombination of electrons and holes
Implementation Method 2
the zinc oxide semiconductor of the N-type semiconductor layer may include an oxygen vacancy
Data Source
AI summary
A light emitting element includes an N-type semiconductor layer including a zinc oxide semiconductor, a P-type semiconductor layer, and an active layer disposed between the N-type semiconductor layer and the P-type semiconductor layer. The active layer has a quantum well including a barrier layer and a well layer including zinc oxide.