Mg-Doped Pit Layer for ESD Resistance in Light-Emitting Elements
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Light-emitting elements using group 3 to 5 compound semiconductors are prone to electrostatic discharge (ESD), which can lead to defective devices and degradation in luminous efficiency and optical power.
Innovation Solution
A light-emitting element structure is developed with a substrate, conductive semiconductor layers, a superlattice layer, an active layer, an electron blocking layer, and a pit layer doped with magnesium (Mg), where the pit layer includes alternating layers of MgN and GaN to effectively block ESD and enhance hole injection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional light-emitting element structure is used, then manufacturing is simpler, but electrostatic discharge occurs causing device defects and performance degradation
Solution Approach 1:
The light-emitting element structure is segmented into multiple functional layers, with the pit layer divided into alternating MgN and GaN sub-layers. This segmentation allows each layer to perform specific functions: the MgN layers provide high resistance to block ESD, while the GaN layers maintain good crystal structure and hole injection capability, thereby resolving the contradiction between ESD resistance and device functionality.
Solution Approach 2:
Different regions of the light-emitting element are given different local properties. The pit layer specifically incorporates Mg-doped regions with high resistance for ESD protection, while other layers maintain their original properties for light emission. This local differentiation allows the device to have both ESD resistance and good luminous performance without requiring complete structural redesign.
2Reliability
If pit layer is doped with Mg to block ESD, then ESD resistance improves, but hole injection efficiency may be affected
Solution Approach 1:
The harmful effect of Mg doping on hole injection is extracted and isolated to specific MgN layers, while pure GaN layers are inserted between them to restore and maintain good hole injection efficiency. This separation allows the Mg-doped regions to provide ESD protection without compromising the overall hole injection capability of the structure.
Solution Approach 2:
The pit layer is constructed as a composite structure combining MgN and GaN materials. The MgN layers contribute high resistance for ESD blocking, while the GaN layers contribute good crystal structure and hole injection properties. This composite approach allows simultaneous achievement of ESD resistance and maintained hole injection efficiency.
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 structure effectively reduces ESD, increases luminous efficiency, and enhances optical power by distributing current and alleviating stress, resulting in fewer defective products and higher optical output.
Implementation Method 1
at least a portion of the pit layer is doped with magnesium (Mg)... effectively blocking or reducing electrostatic discharge (ESD)
Implementation Method 2
the pit layer includes a first layer including MgN and a second layer including GaN, and wherein the first layer and the second layer of the pit layer are provided in a plural number and the plurality of first layers and the plurality of second layers are alternately stacked... enhancing hole injection efficiency
Data Source
AI summary
One embodiment of a light-emitting element comprises: a substrate; a first-conductive type semiconductor layer disposed on the substrate and including at least one pit; a superlattice layer disposed on the first-conductive type semiconductor layer and including at least one pit; an active layer disposed on the superlattice layer and including at least one pit; an electron blocking layer disposed on the active layer and including at least one pit; a pit layer disposed on the electron blocking layer and including at least one pit; and a second-conductive type semiconductor layer disposed on the pit layer, wherein the pit layer can be doped with Mg at at least a portion thereof.