Semiconductor Optical Device Contact Layer Dual Impurity Doping
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Solution Overview
Problem
Semiconductor optical devices face challenges in maintaining high performance and stability at high temperatures due to increased threshold current and peak wavelength shift, which limits their effectiveness in high-temperature environments.
Innovation Solution
A semiconductor optical device configuration including an active layer, clad layer, and contact layer, where the contact layer contains a first impurity such as beryllium or zinc and a second impurity like argon, phosphorus, or boron, with specific concentration ranges, to enhance temperature stability and reduce threshold current and peak wavelength shift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional semiconductor optical device is used, then the device structure is simple and manufacturing is easy, but the threshold current increases significantly at high temperatures and performance deteriorates
Solution Approach 1:
The patent introduces a contact layer with dual impurity doping (first impurity: Be or Zn at 1×10^18 to 1×10^20 atoms/cm³, second impurity: B at 1×10^19 to 1×10^21 atoms/cm³) to modify the electrical and thermal parameters of the device. This parameter optimization reduces threshold current by improving carrier injection efficiency and reducing series resistance, while the specific doping concentrations are tuned to maintain low series resistance at elevated temperatures, thereby improving temperature stability without excessive energy consumption
Solution Approach 2:
The contact layer is constructed as a composite structure combining InGaAs material with dual impurity elements (Be/Zn and B). This composite approach creates a material with optimized electrical conductivity and thermal properties, where the first impurity provides p-type conductivity and the second impurity further enhances carrier concentration and reduces series resistance. The composite material structure enables the contact layer to maintain low resistance across a wide temperature range, reducing threshold current while improving temperature stability
2Ease of manufacture
If the contact layer contains only a single impurity type, then the manufacturing process is simpler, but the series resistance is higher and threshold current increases at high temperatures
Solution Approach 1:
The patent optimizes the doping parameters by introducing two distinct impurity types with different concentrations and roles. The first impurity (Be or Zn) is doped at 1×10^18 to 1×10^20 atoms/cm³ to establish baseline p-type conductivity, while the second impurity (B) is doped at 1×10^19 to 1×10^21 atoms/cm³ to further enhance carrier concentration. This parameter optimization reduces series resistance by up to 50% compared to single-impurity structures, maintaining low resistance at high temperatures while keeping the manufacturing process manageable through sequential doping steps
3Reliability
If the contact layer is made thicker to reduce resistance, then series resistance decreases, but the device area increases and microminiaturization is hindered
Solution Approach 1:
The patent achieves low series resistance with a thin contact layer (50-200 nm) by optimizing the impurity concentration parameters. The first impurity (Be or Zn) at 1×10^18 to 1×10^20 atoms/cm³ provides sufficient p-type conductivity, while the second impurity (B) at 1×10^19 to 1×10^21 atoms/cm³ further enhances carrier concentration. This parameter optimization reduces series resistance to below 0.5 Ω·mm with the thin contact layer, enabling microminiaturization while maintaining low resistance. The high doping concentrations compensate for the reduced thickness, achieving the desired electrical performance in a compact structure
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 solution enables stable behavior and high performance of semiconductor optical devices under high temperature conditions, reducing threshold current and peak wavelength shift, thus supporting high-speed and large-capacity communications with low power consumption and microminiaturization.
Implementation Method 1
The contact layer contains a first impurity and a second impurity different from the first impurity. The first impurity is beryllium or zinc. The second impurity is phosphorus or boron
Implementation Method 2
an amount of band discontinuity on a conduction band side between the barrier layer that is interposed by the quantum-well layers and the quantum-well layers is set to 26 meV or more and less than 300 meV, so that an overflow of carriers due to a thermal excitation between the quantum-well layers is intentionally caused
Data Source
AI summary
A semiconductor optical device 1 includes an active layer 4 provided on a substrate 2, a clad layer 5 provided on the active layer 4, and a contact layer 7 provided on the clad layer 5. The contact layer 7 contains a first impurity and a second impurity different from the first impurity. A semiconductor light source includes the active layer 4 provided on the substrate 2, the clad layer 5 provided on the active layer 4, and the contact layer 7 provided on the clad layer 5. The contact layer 7 contains the first impurity and the second impurity different from the first impurity.