INDUSTRY COMPONENT

Semiconductor Junction

A semiconductor junction is the interface between p-type and n-type semiconductor materials within a photodiode, enabling light-to-current conversion.

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Component Specifications

Definition
A semiconductor junction, specifically a p-n junction, is a critical component in photodiodes where two differently doped semiconductor regions (p-type and n-type) meet. This junction creates a depletion region with an internal electric field that separates electron-hole pairs generated by incident photons, producing a photocurrent proportional to light intensity.
Working Principle
When photons with sufficient energy strike the semiconductor junction, they generate electron-hole pairs. The internal electric field in the depletion region separates these charge carriers, causing electrons to move toward the n-region and holes toward the p-region, creating a measurable photocurrent or voltage across the junction.
Materials
Typically silicon (Si), germanium (Ge), or III-V compounds like gallium arsenide (GaAs) and indium gallium arsenide (InGaAs), doped with elements such as boron (p-type) and phosphorus (n-type).
Technical Parameters
  • Rise Time 1-100 ns
  • Dark Current 1 nA to 10 μA
  • Responsivity 0.5-1.0 A/W
  • Wavelength Range 400-1100 nm (Si), 800-1700 nm (InGaAs)
  • Breakdown Voltage 20-100 V
  • Junction Capacitance 1-100 pF
Standards
ISO 10110, DIN 5031

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Semiconductor Junction.

semiconductor junction p-n junction photodiode light detection silicon photodiode depletion region electron-hole pairs photocurrent Semiconductor Junction in Computer, Electronic and Optical Product Manufacturing

Parent Products

This component is used in the following industrial products

Photodiode Receiver

A semiconductor device that converts infrared light signals into electrical current within an optical port system.

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Engineering Analysis

Risks & Mitigation
  • Thermal runaway at high temperatures
  • Degradation from excessive reverse bias
  • Contamination during manufacturing affecting junction properties
FMEA Triads
Trigger: High reverse bias voltage
Failure: Junction breakdown leading to permanent damage
Mitigation: Implement voltage clamping circuits and adhere to maximum ratings
Trigger: Exposure to high-intensity light
Failure: Saturation or burnout of the junction
Mitigation: Use optical filters and limit operating light levels
Trigger: Manufacturing defects like doping irregularities
Failure: Reduced responsivity or increased dark current
Mitigation: Strict quality control and testing during fabrication

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±5% for responsivity, ±10% for dark current under standard test conditions
Test Method
IEC 60747-5 for photoelectric characteristics, including spectral response and linearity measurements

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the role of a semiconductor junction in a photodiode?

It converts incident light into electrical current by separating electron-hole pairs generated in the depletion region.

How does doping affect the semiconductor junction?

Doping creates p-type and n-type regions with excess holes or electrons, forming the junction and establishing the internal electric field essential for charge separation.

What materials are commonly used for semiconductor junctions in photodiodes?

Silicon for visible to near-infrared, germanium for infrared, and III-V compounds like GaAs and InGaAs for specific wavelength optimizations.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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