Oxygen-Doped GaAs Buffer Structure for Dislocation Kinking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
GaAs growth substrates have a high dislocation density, which can lead to spontaneous failures and increased aging in radiation-emitting semiconductor components, as dislocations migrate into overlying layers, and existing buffer layers or ELOG masking layers are either ineffective or require significant effort to prevent this issue.
Innovation Solution
A growth structure for radiation-emitting semiconductor components is developed, comprising a semiconductor substrate made of GaAs and a buffer structure with an n-doped oxygen-containing layer, which incorporates oxygen to kink dislocation lines, preventing them from reaching the luminescent diode structure and thereby improving crystal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional buffer layers or ELOG masking layers are used, then dislocation density reduction is attempted, but the dislocation density remains high and manufacturing complexity increases
Solution Approach 1:
The invention changes the chemical composition parameter of the buffer layer by incorporating oxygen into the GaAs buffer layer. This parameter change fundamentally alters the interaction between dislocations and the buffer layer, causing dislocations to kink and stop at the oxygen-containing buffer layer rather than propagating through it, thereby reducing dislocation density in the active region without requiring complex ELOG masking structures
Solution Approach 2:
The oxygen-containing buffer layer acts as an intermediary between the GaAs substrate and the luminescent diode structure. The oxygen atoms in the buffer layer serve as a mediating element that interacts with dislocation lines, causing them to kink and terminate, thus preventing direct transmission of dislocations from the substrate to the active region while maintaining a relatively simple layered structure
2Ease of manufacture
If GaAs substrate is used, then manufacturing cost is reduced, but dislocation density increases leading to component failures
Solution Approach 1:
The invention converts the harmful effect of using GaAs substrate (high dislocation density) into a beneficial outcome by introducing an oxygen-containing buffer layer that actively captures and terminates dislocations. The GaAs substrate's inherent dislocation generation is transformed from a direct threat to the active region into a controlled phenomenon where dislocations are intentionally stopped at the buffer layer, maintaining cost-effectiveness while improving reliability
Solution Approach 2:
The oxygen-containing buffer layer serves as a protective intermediary between the GaAs substrate and the luminescent diode structure. This intermediary layer accepts the dislocation burden from the GaAs substrate, preventing dislocations from reaching the active region, thereby enabling the use of cost-effective GaAs substrates without sacrificing component reliability
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 use of an oxygen-containing buffer layer effectively kinks dislocation lines, significantly reducing their presence in the luminescent diode structure, thereby enhancing the crystal quality and reliability of radiation-emitting semiconductor components while maintaining acceptable manufacturing costs.
Implementation Method 1
the oxygen in the n-doped layer contributes to the compensation of the dislocation density of the semiconductor substrate... a large part of the dislocation lines will be kinked so that they do not reach a surface of the growth substrate
Data Source
AI summary
In an embodiment a growth structure for a radiation-emitting semiconductor component includes a semiconductor substrate containing a material based on arsenide compound semiconductors and a buffer structure arranged on the semiconductor substrate, wherein the buffer structure includes a buffer layer having at least one n-doped layer and wherein the n-doped layer contains oxygen, and a molar fraction of oxygen in the n-doped layer is between 1015 cm−3 and 1019 cm−3, inclusive.