Optoelectronic Semiconductor Chip with Built-in ESD Bridging Element
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Solution Overview
Problem
Existing optoelectronic semiconductor chips face challenges in providing effective electrostatic discharge (ESD) protection without compromising optical efficiency or increasing manufacturing costs and space, as existing methods either lead to semiconductor layer sequence losses or require separate protective elements.
Innovation Solution
An optoelectronic semiconductor chip with a semiconductor layer sequence and a bridging element that has nonlinear electrical resistance, connected antiparallel or parallel to the semiconductor layer sequence, which discharges overvoltages and protects the chip from ESD pulses, reducing the risk of damage while maintaining optical efficiency by being integrated within the chip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If protective measures such as epitaxial protective layers with crystal defects or microdiodes are integrated into the semiconductor layer sequence, then ESD protection is improved, but optical efficiency of the semiconductor chip deteriorates
Solution Approach 1:
The protective function is extracted from the semiconductor layer sequence itself and implemented as a separate bridging element connected to the semiconductor chip. This separation allows the semiconductor layer sequence to maintain its optical efficiency while the bridging element provides ESD protection through its nonlinear electrical resistance characteristic.
Solution Approach 2:
A bridging element with nonlinear electrical resistance is introduced as an intermediary component between the semiconductor chip and the external environment. This mediator absorbs electrostatic discharge pulses and overvoltages, protecting the semiconductor layer sequence without requiring modifications that would compromise optical efficiency.
2Reliability
If a separate protective element such as a protective diode is used, then ESD protection is improved, but device complexity and manufacturing costs increase
Solution Approach 1:
The bridging element is integrated into the semiconductor chip structure by connecting it to the semiconductor layer sequence through electrical contacts formed during the manufacturing process. This merging approach provides ESD protection without requiring separate assembly steps or additional complex interconnections, thereby maintaining manufacturing simplicity.
Solution Approach 2:
The bridging element serves multiple functions: it provides ESD protection, handles overvoltages in both forward and reverse directions, and can be implemented using standard semiconductor manufacturing processes. This multi-functionality reduces the need for additional specialized components and simplifies the overall device architecture.
3Reliability
If a separate protective element is used, then ESD protection is improved, but manufacturing costs increase
Solution Approach 1:
The bridging element is manufactured using the same semiconductor fabrication processes as the main chip, including epitaxial growth and contact formation. This integration eliminates the need for separate manufacturing steps and assembly operations, thereby reducing manufacturing costs while providing effective ESD protection.
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 protects the semiconductor chip from electrostatic discharges and overvoltages, enhancing its stability and reducing manufacturing costs by eliminating the need for external protective elements, while minimizing optical losses and maintaining efficient radiation generation.
Implementation Method 1
the bridging element comprises a nonlinear electrical resistance, which is higher in the case of an operating voltage of the optoelectronic semiconductor chip in the forward direction than an electrical resistance of the semiconductor layer sequence and is lower in the case of overvoltages in the reverse direction than the electrical resistance of the semiconductor layer sequence, such that electrical charge is discharged via the bridging element in the case of overvoltages
Implementation Method 2
An active zone with a pn junction, which is formed between the first and second semiconductor regions. In particular, the active zone may be provided for generating radiation
Data Source
AI summary
Described is an optoelectronic semiconductor chip (1) with a built-in bridging element (9, 9A) for overvoltage protection.