Nitride Semiconductor V-Pits for Electrostatic Discharge Protection
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Solution Overview
Problem
Nitride semiconductor devices face poor electrostatic discharge characteristics due to high threading dislocation density, leading to damage from electrostatic discharge, and existing solutions like Zener diodes increase costs and process time, while lattice-matched GaN substrates are expensive and limited in application.
Innovation Solution
A semiconductor device with V-pits of larger size and higher density, filled with a high-resistance filling layer, which enhances electrostatic discharge characteristics without using Zener diodes, by employing a low-temperature growth layer and a high-concentration barrier layer to increase internal capacitance and prevent current leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Zener diodes are used to protect nitride semiconductor devices from electrostatic discharge, then electrostatic discharge characteristics are improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts and eliminates the need for external Zener diode protection by integrating electrostatic discharge prevention functionality directly into the semiconductor device structure through V-pit formation and p-type semiconductor layer optimization, thereby reducing device complexity while maintaining reliability
Solution Approach 2:
The nitride semiconductor device becomes self-protecting against electrostatic discharge through internally formed V-pits and optimized p-type layers that create natural current blocking mechanisms, eliminating the need for separate protection components
2Reliability
If Zener diodes are used to protect nitride semiconductor devices from electrostatic discharge, then electrostatic discharge characteristics are improved, but manufacturing cost increases
Solution Approach 1:
The patent merges the electrostatic discharge protection function with the existing semiconductor device structure by forming V-pits and optimizing p-type semiconductor layers during the same manufacturing process, eliminating the need for separate Zener diode components and reducing overall manufacturing cost
3Reliability
If a p-type semiconductor layer is grown at high temperature to fill V-pits and enhance electrostatic discharge characteristics, then electrostatic discharge characteristics are improved, but current leakage increases due to narrow process margin
Solution Approach 1:
The patent optimizes the growth temperature parameter within a specific range (950°C to 1050°C) to achieve the optimal balance between V-pit filling and current leakage prevention, demonstrating precise parameter control to resolve the contradiction between electrostatic discharge characteristics and current leakage
Solution Approach 2:
The patent creates local quality variations by forming V-pits with specific depth and width characteristics, and by controlling the p-type semiconductor layer doping distribution, thereby achieving different functional properties in different regions to simultaneously improve electrostatic discharge characteristics and reduce current leakage
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 effectively prevents damage from electrostatic discharge, improves electrostatic discharge characteristics, and maintains luminous intensity and electric properties of nitride semiconductor devices, achieving compactness and high efficiency without the need for additional components like Zener diodes.
Implementation Method 1
the first upper conductive type semiconductor layer has a higher defect density than the first lower conductive type semiconductor layer and includes a V-pit generation layer including starting points of the V-pits
Implementation Method 2
a second conductive type semiconductor layer placed over the first conductive type semiconductor and filling the V-pits
Data Source
AI summary
Disclosed are semiconductor devices and methods of manufacturing the same. The semiconductor device includes: a first conductive type semiconductor layer including a first lower conductive type semiconductor layer and a first upper conductive type semiconductor layer; a V-pit passing through at least one portion of the first upper conductive type semiconductor layer; a second conductive type semiconductor layer placed over the first conductive type semiconductor and filling the V-pit; and an active layer interposed between the first and second conductive type semiconductor layers with the V-pit passing through the active layer. The first upper conductive type semiconductor layer has a higher defect density than the first lower conductive type semiconductor layer and includes a V-pit generation layer comprising a starting point of the V-pit. The semiconductor device includes the V-pits having a large size and a high density to efficiently preventing damage to the semiconductor device due to electrostatic discharge.