INDUSTRY COMPONENT

Charge Transfer Structure

Charge Transfer Structure is a critical component in CCD detector arrays that enables sequential transfer of photogenerated electrons through potential wells for signal readout.

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Component Specifications

Definition
The Charge Transfer Structure is an integrated semiconductor component within CCD (Charge-Coupled Device) detector arrays that facilitates the controlled movement of photogenerated charge packets through a series of potential wells created by clocked electrode gates. This structure consists of polysilicon electrodes deposited on an insulating oxide layer above a silicon substrate, arranged in overlapping patterns to create transfer channels. During operation, precisely timed voltage sequences applied to these electrodes create moving potential minima that transport electrons from pixel to pixel toward the output amplifier, enabling the sequential readout of image information with minimal charge loss or distortion.
Working Principle
The Charge Transfer Structure operates on the principle of charge-coupled device technology, where photogenerated electrons are temporarily stored in potential wells beneath electrodes. By applying phased voltage pulses to adjacent electrodes in a precise sequence, the potential wells are modulated to create a directional gradient that pushes charge packets along the semiconductor surface. This bucket-brigade transfer mechanism moves electrons through the array with high efficiency (typically >99.99% per transfer) while maintaining spatial and charge integrity through careful control of electrode geometry, doping profiles, and clocking waveforms.
Materials
Primary materials include: P-type silicon substrate (resistivity 10-100 Ω·cm), thermally grown silicon dioxide gate insulator (thickness 100-150 nm), doped polysilicon electrodes (phosphorus or arsenic doped, thickness 300-500 nm), silicon nitride passivation layer, aluminum or copper interconnects. Advanced versions may incorporate buried channel designs with additional n-type epitaxial layers.
Technical Parameters
  • Dark Current <1 nA/cm² at 25°C
  • Charge Capacity 100,000-1,000,000 electrons per pixel
  • Clock Frequency 1-50 MHz
  • Electrode Pitch 5-20 μm
  • Number of Phases 2, 3, or 4 phase designs
  • Operating Voltage 5-15 V clock pulses
  • Transfer Efficiency >99.99% per transfer
  • Operating Temperature -50°C to +80°C
Standards
ISO 12232, ISO 15739, DIN 19040, DIN 58141

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Charge Transfer Structure.

CCD charge transfer semiconductor imaging component electron transfer structure photodetector array image sensor technology potential well transfer clocked electrode gates Charge Transfer Structure Charge Transfer Structure in Computer, Electronic and Optical Product Manufacturing

Parent Products

This component is used in the following industrial products

CCD Detector Array

A photosensitive electronic component that converts light signals into electrical signals for detection and measurement in optical spectrometers.

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Engineering Analysis

Risks & Mitigation
  • Charge transfer inefficiency accumulation
  • Clock feedthrough interference
  • Electromigration in electrodes
  • Radiation-induced damage
  • Thermal stress cracking
FMEA Triads
Trigger: Interface state trapping at Si-SiO₂ boundary
Failure: Progressive charge transfer inefficiency leading to image smearing
Mitigation: Optimized thermal oxidation processes, hydrogen annealing, and buried channel designs
Trigger: Electromigration in polysilicon electrodes under high current density
Failure: Increased electrode resistance and eventual open circuit
Mitigation: Current density limits in design, barrier layers, and redundant electrode structures
Trigger: Clock feedthrough from rapid voltage transitions
Failure:
Mitigation: Balanced clock drivers, shielded routing, and correlated double sampling circuits

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Electrode alignment ±0.25 μm, oxide thickness ±5%, doping concentration ±10%
Test Method
Electro-optical testing with calibrated light sources, charge transfer efficiency measurement using fat-zero technique, dark current characterization, modulation transfer function analysis

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 main function of the Charge Transfer Structure in CCD arrays?

The primary function is to transport photogenerated electrons from individual pixels to the output amplifier with minimal loss or distortion, enabling the sequential readout of image information while maintaining spatial and charge integrity.

How does the Charge Transfer Structure achieve high transfer efficiency?

High transfer efficiency (>99.99%) is achieved through optimized electrode geometry, precise doping profiles, carefully controlled oxide thickness, and sophisticated clocking waveforms that minimize charge trapping at interfaces and ensure complete charge packet movement between potential wells.

What are the common failure modes of Charge Transfer Structures?

Common failures include charge transfer inefficiency due to interface states, dark current increase from contamination, electrode breakdown from voltage spikes, and clock feedthrough interference. These are mitigated through cleanroom manufacturing, proper passivation, and robust drive circuitry design.

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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