Zn-Diffusion Barrier in AlGaInAs Light-Emitting Devices
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Solution Overview
Problem
Semiconductor light-emitting devices with Zn-doped p-type layers suffer from inter-diffusion issues, leading to reduced reliability and performance degradation due to Zn atoms migrating into the active layer, particularly when the p-type layer contains Zn atoms.
Innovation Solution
Incorporating a silicon-doped protection layer between the active layer and the p-type cladding layer or within recessed portions of the burying layer to prevent Zn inter-diffusion, using a process involving phosphine, disilane, and arsine in a high-temperature atmosphere to form the protection layer, which effectively confines Zn atoms and maintains the integrity of the active layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Zn atoms are used as p-type dopant material in cladding layers, then electrical performance is improved, but Zn atoms inter-diffuse into the active layer causing reliability degradation
Solution Approach 1:
An Al-containing layer is introduced as an intermediary barrier between the Zn-doped p-type cladding layer and the active layer. This intermediate layer prevents Zn atoms from diffusing into the active layer while maintaining the electrical performance benefits of Zn doping in the cladding structure.
Solution Approach 2:
The device structure is segmented into distinct functional layers: an Al-containing barrier layer is created between the Zn-doped cladding and the active region. This segmentation isolates the harmful Zn diffusion path while preserving the beneficial electrical properties of each layer.
2Ease of manufacture
If high temperature processing is used to form the device structure, then manufacturing capability is improved, but Zn inter-diffusion is accelerated
Solution Approach 1:
The Al-containing protection layer is formed preliminarily before subsequent high-temperature processing steps. This pre-formed barrier layer is designed to withstand the high-temperature manufacturing processes that follow, preventing Zn diffusion even when elevated temperatures are used for ease of manufacture.
Solution Approach 2:
The device structure incorporates an Al-containing layer with specific compositional parameters that provide thermal stability. This layer maintains its barrier properties during high-temperature processing, enabling manufacturing at elevated temperatures without accelerating Zn inter-diffusion.
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 silicon-doped protection layer significantly reduces Zn inter-diffusion, enhancing the reliability and extending the lifetime of the semiconductor light-emitting device by suppressing non-radiative centers and maintaining optimal performance even under high-temperature conditions.
Implementation Method 1
the Zn atoms may inter-diffuse into the active layer and may cause the less reliability of the device and the degradation of the performance of the device
Implementation Method 2
at least one protection layer doped with silicon (Si) that prevents the inter-diffusion of zinc (Zn) atoms
Data Source
AI summary
A light-emitting device with a protection layer for Zn inter-diffusion and a process to form the device are described. The device of the invention provides an active layer containing aluminum (Al) as a group III element, typically AlGaInAs, and protection layers containing silicon (Si) to prevent the inter-diffusion of zing (Zn) atoms contained in p-type layers surrounding the active layer. One of protection layers is put between the active layer and the p-type cladding layer, while, the other of protection layers is disposed between the active layer and the p-type burying layer.