CCD Primer

Bracket Pulsing
CCD Grading
Cosmic Rays
Dark Current
Deep Depletion CCD
Detection Modes
Dual Capacity Mode
Dual Readout Mode
Dynamic Range
Etaloning in CCDs
UV Extension
Fiber Optics
Flat Fielding
Full Well Capacity
Image Calibration
Imager Architectures
Image Intensifiers
Kinetics Mode
Matching Resolution
MPP Mode
Noise Sources
On-chip Multiplication Gain
Open Poly CCD
Optical Window
Quantum Efficiency
Readout vs Frame Rate
Reducing Dark Current
Saturation/ Blooming
Signal to Noise Ratio
Spurious Charge
XP Cooling


Open Poly or Open Eelctrode CCD

The Open Poly or open-electrode CCD is a front illuminated CCD with a modified electrode structure to enhance the UV sensitivity. Some of the polysilicon gate structure, which absorbs UV radiation is removed, leaving a large part (40%) of the pixel area uncovered.

See Figure 1.
QE for the Open Poly front illuminated CCDTo control the surface potential in the open area, a shallow p+ implant is located in the buried channel. This pins the local surface potential to that of the substrate. Thus the device operates in a similar manner to a conventional front illuminated CCD at a 40% reduced full well capacity. The QE of the device is increased through the spectral range and is roughly a factor of 2 times better in the UV vs. Lumogen coated devices, while exhibiting none of the etaloning behavior of back illuminated CCD’s beyond 800 nm. We offer the Spec-10 : 256E 1024 x 256 pixel spectroscopy CCD in open-electrode technologie .


p+ implant located in the buried channel
Figure 1