VCSEL Current Leakage Reduction via Doped DBR Confinement
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Solution Overview
Problem
Conventional vertical cavity surface emitting laser devices experience current leakage due to gaps formed when creating confinement members, which can affect the efficiency of electrical energy delivery to the active layer.
Innovation Solution
A consumer semiconductor laser design featuring a first-type and second-type doped distributed Bragg reflectors with varying doping concentrations, where the second-type doped distributed Bragg reflector forms a confinement member with a lower doping concentration region directly contacting the active layer, reducing current leakage by eliminating intermediate layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a gap is left between the active layer and the confinement member to avoid damage during formation, then the active layer is protected from damage, but current leakage occurs through the gap
Solution Approach 1:
An intermediate layer is introduced between the active layer and the confinement member. This intermediate layer serves as a mediator that prevents direct contact (avoiding damage to the active layer during confinement member formation) while simultaneously providing electrical isolation (preventing current leakage through the gap). The intermediate layer thus resolves the contradiction by fulfilling both protective and isolating functions.
2Ease of manufacture
If the confinement member is formed by partial oxidation or proton implantation, then the confinement structure is created, but current leakage occurs due to the necessary gap
Solution Approach 1:
The intermediate layer acts as a mediator that enables the confinement member to be formed through standard processes (partial oxidation or proton implantation) while preventing the harmful effect of current leakage. The intermediate layer provides a reliable electrical barrier that maintains device reliability despite the presence of the manufacturing-induced gap.
3Power
If electrical energy is delivered to the active layer, then laser emission is achieved, but current leakage reduces the efficiency of energy delivery
Solution Approach 1:
The intermediate layer serves as an electrical mediator that isolates the active layer from the confinement member, preventing current leakage pathways. This ensures that electrical energy delivered to the active layer is efficiently converted to laser emission rather than being lost through leakage, thereby improving overall device 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 design effectively minimizes current leakage, enhancing the efficiency of electrical energy delivery and laser beam emission, suitable for applications like proximity sensing, gesture recognition, and 3D sensing.
Implementation Method 1
a bottom distributed Bragg reflector 902 disposed on the substrate 901, an active layer 903 disposed on the bottom distributed Bragg reflector 902, a top distributed Bragg reflector 904 disposed on the active layer 903
Implementation Method 2
The second-type doped distributed Bragg reflector 140 defines a first doping concentration region 141 and a second doping concentration region 142 disposed between the first doping concentration region 141 and the active layer 130
Data Source
AI summary
A vertical cavity surface emitting laser device includes a substrate, a first-type doped distributed Bragg reflector (DBR) disposed on the substrate, a first electrode disposed on the substrate, an active layer disposed on the first-type doped DBR, a second-type DBR disposed on the active layer, and a second electrode disposed on the second-type DBR. The second-type DBR defines a first doping concentration region, and a second doping concentration region disposed between the first doping concentration region and the active layer and that has a doping concentration less than that of the first doping concentration region. The second-type doped DBR has a confinement member formed in the first doping concentration region, and defining an aperture.