Quantum efficiency overestimation and deterministic cross talk resulting from interpixel capacitance
Abstract
Pixels in both hybridized and monolithic complementary
metal-oxide semiconductor (CMOS) detector arrays may couple capacitively
to their neighboring pixels. This “interpixel capacitance” can signifi-
cantly distort the characterization of conversion efficiency and modulation
transfer function (MTF) in MOS devices. These effects have been
largely unaccounted for in measurements to date. In this work, the effects
of this coupling are investigated. Compensation methods for these
errors are described and applied to silicon P-I-N array measurements.
The measurement of Poisson noise, traditionally done by finding the
mean square difference in a pair of images, needs to be modified to
include the mean square correlation of differences with neighboring
pixels.