Semiconductor Device Integrating Zener Diode and Capacitor
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Solution Overview
Problem
Existing semiconductor devices face challenges in integrating zener diodes with desired breakdown voltages and capacitors with reduced capacitance voltage dependence, as the process of forming dedicated impurity diffusion regions for each circuit element increases manufacturing complexity and cost.
Innovation Solution
A semiconductor device configuration that includes a vertical zener diode and a capacitor, where the first impurity diffusion region determines the breakdown voltage and the second impurity diffusion region reduces capacitance voltage dependence, both formed in the same semiconductor device using shared manufacturing processes, with additional diffusion regions for improved insulation and element isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated impurity diffusion regions are formed for each circuit element (zener diode and capacitor), then the desired specifications (breakdown voltage and capacitance voltage dependence) are achieved, but the manufacturing complexity and cost increase due to increased number of masks and processes
Solution Approach 1:
The patent merges the formation of impurity diffusion regions for the zener diode and capacitor into a single simultaneous process. The first and second impurity diffusion regions are formed at the same time using a common ion implantation or diffusion step, eliminating the need for separate masks and process steps for each circuit element, thereby reducing manufacturing complexity while maintaining the ability to achieve desired specifications for both elements
Solution Approach 2:
The patent creates a universal impurity diffusion process that serves multiple functions: forming the first impurity diffusion region for the zener diode's P-type region and the second impurity diffusion region for the capacitor's electrode region simultaneously. This multi-functional approach allows a single process step to fulfill the requirements of different circuit elements with different specifications
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 allows for the simultaneous integration of zener diodes and capacitors with desired specifications without significantly increasing manufacturing processes, enabling the realization of various circuits while maintaining efficient production.
Implementation Method 1
a first conductivity type first impurity diffusion region that is arranged in the first well; a first conductivity type second impurity diffusion region that is arranged in a second region of the semiconductor layer
Implementation Method 2
a reduction in breakdown voltage of the gate insulating film caused by abnormal growth of an oxide film when the gate insulating film is formed by oxidizing a surface of the semiconductor substrate
Data Source
AI summary
A semiconductor device is provided in which a zener diode having a desired breakdown voltage and a capacitor in which voltage dependence of capacitance is reduced are mounted together, and various circuits are realized. The semiconductor device includes: a semiconductor layer; a first conductivity type well that is arranged in a first region of the semiconductor layer; a first conductivity type first impurity diffusion region that is arranged in the well; a first conductivity type second impurity diffusion region that is arranged in a second region of the semiconductor layer; an insulating film that is arranged on the second impurity diffusion region; an electrode that is arranged on the insulating film; and a second conductivity type third impurity diffusion region that is arranged at least on the first impurity diffusion region.