Schottky Diode P-Type Segmentation Antistatic Capability
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Solution Overview
Problem
Schottky diodes face challenges in achieving high antistatic capability and managing forward voltage drop, which affects their performance and application in electronic products.
Innovation Solution
The Schottky diode structure is modified by incorporating a P-type doped area with a low-concentration lower layer and a high-concentration upper layer within a protection ring on the N− type doped drift layer, enhancing surface ion concentration and carrier injection, thereby increasing antistatic capability and reducing forward voltage drop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional Schottky diode structure with a single-layer P-type doped area is used, then the manufacturing process is simple, but the antistatic capability is insufficient and the forward voltage drop is high
Solution Approach 1:
The P-type doped area is segmented into two distinct layers: a first P-type doped area with lower ion concentration and a second P-type doped area with higher ion concentration. This segmentation allows each layer to perform different functions - the lower concentration layer provides baseline protection while the higher concentration layer enhances antistatic capability, resolving the contradiction between simplicity and performance.
Solution Approach 2:
Different regions of the P-type doped area are assigned different ion concentrations to optimize local performance. The first P-type doped area (lower concentration) and second P-type doped area (higher concentration) create local quality variations that improve overall antistatic capability while managing forward voltage drop characteristics.
2Reliability
If the P-type doped area has high ion concentration throughout, then the antistatic capability increases, but the forward voltage drop increases and manufacturing complexity increases
Solution Approach 1:
By dividing the P-type doped area into two concentration zones, the patent achieves high antistatic capability through the second layer's high ion concentration while the first layer's lower concentration helps manage the forward voltage drop, preventing it from becoming excessively high.
Solution Approach 2:
The patent changes the ion concentration parameter across different regions of the P-type doped area. The first P-type doped area has a lower ion concentration parameter while the second P-type doped area has a higher ion concentration parameter, allowing optimization of both antistatic capability and forward voltage drop through parameter variation.
3Reliability
If a protection ring with P-type doped area is added to the Schottky diode, then the antistatic capability improves, but the device structure becomes more complex
Solution Approach 1:
The protection ring's P-type doped area is segmented into two layers with different ion concentrations. This segmentation provides a balanced solution that improves antistatic capability through the dual-layer structure while maintaining relative manufacturing simplicity by using standard doping techniques applied in two stages.
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 configuration enhances the Schottky diode's antistatic capability and increases the reverse breakdown voltage, while lowering the forward voltage drop, improving its overall performance and reliability in electronic applications.
Implementation Method 1
The P-type doped area has a low-concentration lower layer and a high-concentration upper layer. Since the P-type doped area is composed of the low-concentration lower layer and the high-concentration upper layer, the surface ion concentration of the P-type doped area is increased, good for injection of a large amount of ions.
Implementation Method 2
A metal-semiconductor junction is used as a Schottky barrier for current rectification, different from the P-N junction of normal diodes that are purely formed between semiconductors. The contact region between the metal layer and the N− type doped drift layer and the P-type doped area forms a Schottky contact.
Implementation Method 3
When a forward bias is imposed, the free electrons in the N− type doped drift layer 81 have sufficient energy to move to the metal layer 84, thereby producing an electric current.
Data Source
AI summary
A Schottky diode with high antistatic capability has an N− type doped drift layer formed on an N+ type doped layer. The N− type doped drift layer has a surface formed with a protection ring. Inside the protection ring is a P-type doped area. The N− type doped drift layer surface is further formed with an oxide layer and a metal layer. The contact region between the metal layer and the N− type doped drift layer and the P-type doped area forms a Schottky contact. The P-type doped area has a low-concentration lower layer and a high-concentration upper layer, so that the surface ion concentration is high in the P-type doped area. The Schottky diode thus has such advantages of lowered forward voltage drop and high antistatic capability.