Multi-Active Area Semiconductor Structure for Low Optical Crosstalk
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Solution Overview
Problem
Existing technologies fail to simultaneously improve light-emission efficiency and reduce optical field crosstalk in semiconductor devices.
Innovation Solution
A multi-active area semiconductor structure is designed with a (2k−1)th common confining layer and a 2kth common confining layer in contact with tunnel junctions, and a kth quantum well layer with a narrower forbidden band width than adjacent semiconductor layers, reducing thickness and refractive index differences to minimize crosstalk and resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the thickness of confining layers is reduced to improve light-emission efficiency, then electro-optical conversion efficiency is improved, but optical field crosstalk between adjacent active layers increases
Solution Approach 1:
A quantum well layer is introduced as an intermediary between adjacent active layers. This quantum well layer has a narrower forbidden band width than the surrounding semiconductor layers, creating a refractive index contrast that confines optical fields within each active layer and prevents crosstalk, while allowing the overall structure to maintain thin dimensions for high efficiency
Solution Approach 2:
The quantum well layer is positioned locally at specific interfaces between active layers, providing targeted optical confinement only where needed. The layer's forbidden band width is specifically engineered to be narrower than adjacent layers, creating localized refractive index variations that control optical field distribution without affecting the overall device thickness
2Power
If multiple active layers are stacked to increase output power, then light-emission efficiency is improved, but device complexity increases
Solution Approach 1:
The device is segmented into multiple identical or similar active layers stacked vertically, each contributing to the total output power. This modular segmentation allows systematic scaling of power output by simply adding more layers following the same structural pattern, managing complexity through repetition rather than unique designs
Solution Approach 2:
Multiple active layers are merged into a single integrated structure with shared confining layers and tunnel junctions. The common confining layers serve multiple adjacent active layers simultaneously, reducing the total number of discrete components and simplifying the overall device architecture while maintaining high output power
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 enhances light-emission efficiency while minimizing optical field crosstalk, reducing thickness and resistance, and maintaining consistent laser performance.
Implementation Method 1
a kth quantum well layer, the kth second-semiconductor layer is arranged on a side of the kth first-semiconductor layer away from the kth active layer, the kth quantum well layer is arranged between the kth second-semiconductor layer and the kth first-semiconductor layer, and a forbidden band width of the kth quantum well layer is less than both a forbidden band width of the kth first-semiconductor layer and a forbidden band width of the kth second-semiconductor layer
Implementation Method 2
a kth tunnel junction arranged between a kth active layer and a (k+1)th active layer, where k is greater than or equal to 1 and less than or equal to N−1; and the kth tunnel junction includes a kth first-semiconductor layer and a kth second-semiconductor layer that are of opposite conductivity types
Implementation Method 3
a (2k−1)th common confining layer arranged between the kth active layer and the kth tunnel junction, where the (2k−1)th common confining layer is in contact with the kth tunnel junction; and a 2kth common confining layer arranged between the (k+1)th active layer and the kth tunnel junction, where the 2kth common confining layer is in contact with the kth tunnel junction
Data Source
AI summary
A multi-active area semiconductor structure and a method for manufacturing same. The multi-active area semiconductor structure includes: a (2k−1)th common confining layer arranged between a kth active layer and a kth tunnel junction and in contact with the kth tunnel junction; and a 2kth common confining layer arranged between the kth active layer and a (k+1)th tunnel junction and in contact with the kth tunnel junction, where a forbidden band width of a kth quantum well layer is less than both a forbidden band width of a kth first-semiconductor layer and a forbidden band width of a kth second-semiconductor layer; a total thickness of the (2k−1)th common confining layer and the 2kth common confining layer is greater than a critical optical field coupling thickness and less than or equal to twice the critical optical field coupling thickness; and a thickness of the kth quantum well layer is less than or equal to 1/10 of a thickness of the (2k−1)th common confining layer, and the thickness of the kth quantum well layer is less than or equal to 1/10 of a thickness of the 2kth common confining layer. The multi-active area semiconductor structure has effectively improved light-emission efficiency and reduced optical field crosstalk.