Avalanche Photodiode With Segmented Regions
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Solution Overview
Problem
Current avalanche photodiodes face trade-offs between dark current and breakdown voltage, where reducing one parameter often increases the other, limiting their performance in applications such as long-range fiber-optic telecommunication and quantum sensing.
Innovation Solution
The design incorporates a variable width charge and multiplication region with a separate absorption region, allowing for independent adjustment of dark current and breakdown voltage through varying the pitch and dimensions of these regions, reducing avalanche noise and breakdown voltage without increasing dark current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If separate absorption, charge and multiplication regions are used, then dark current is reduced, but breakdown voltage increases
Solution Approach 1:
The photodiode structure is divided into separate absorption, charge, and multiplication regions, each optimized for its specific function. The absorption region captures photons, the charge region collects carriers, and the multiplication region amplifies signals, allowing independent optimization of dark current and breakdown voltage characteristics
Solution Approach 2:
Each region is doped with specific concentrations and materials tailored to its local function. The absorption region uses one doping profile, the charge region uses another, and the multiplication region uses a third, allowing each zone to perform its function optimally without compromising the other parameters
2Reliability
If multiplication region is placed inside the absorption region, then breakdown voltage is reduced, but dark current increases
Solution Approach 1:
The multiplication region is spatially separated from the absorption region and placed in a distinct zone with appropriate doping. This segmentation allows the multiplication function to be performed at a location that reduces breakdown voltage without causing dark current generation in the absorption region
Solution Approach 2:
A charge region is introduced as an intermediary between the absorption region and the multiplication region. This charge region collects carriers from the absorption region and transports them to the multiplication region, preventing direct interaction that would cause dark current while maintaining low breakdown voltage
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
This approach enables reduced breakdown voltage without increasing dark current, while also minimizing avalanche noise, thereby enhancing the performance of avalanche photodiodes in sensitive applications.
Implementation Method 1
An avalanche photodiode (APD) is a highly sensitive semiconductor photodiode that exploits the photoelectric effect to convert light into electricity
Implementation Method 2
An avalanche photodiode (APD) is a highly sensitive semiconductor photodiode
Data Source
AI summary
The present disclosure relates to semiconductor structures and, more particularly, to photodiode structures and methods of manufacture. The structure includes: a charge region having a first doping concentration and a variable width; a multiplication region adjacent to the charge region; and an absorption region adjacent to the variable width charge region.