Without UV illumination, the observed dark current
was approximately 1.62 mA and 3.56 mA at bias of 5 V for the Au/ZnO Schottky and the Au/[Zn.sub.0.95][Fe.sub.0.05]O, respectively.
I only needed to look at the first raw images as they downloaded from the Parsec to realize that this camera delivers on its promise of high resolution, low dark current
, and high sensitivity.
At a 5-V bias, the measured photocurrent was 4.74mA/[cm.sup.2] and the dark current
was 4.56 x [10.sup.-2] mA/[cm.sup.2].
It is noted that the pure TNT-arrays photoelectrode produces the highest dark current
, while the double-layered and P25 photoanode produces the lowest dark current
at the same potential of about 0.55 V.
Applications for PocketPico Picoammeter include: photodiode current and dark current
measurement, ion beam monitoring and measurement, SEM and TEM beam current measurement, optical fiber alignment, component, sensor, and device I-V characterization, materials resistance testing, leakage current testing, analog and mixed-signal circuit testing & analysis, teaching labs, product demonstrations, etc.
This may be an acceptable approach for short exposures, which don't require deep cooling since there is little time for dark current
to accumulate in the pixels.
The modules comprise a glass body with the 2-D CCD array, which enables automatic dark current
correction during the measurement because the measuring signal is not imaged onto the entire detector area.
This image sensor uses the company's Pixelux technology, which uses dark current
pinned photodiodes and a four-transistor (4T) shared pixel structure to enable the manufacture of CMOS image sensors that approach the size of today's smallest CCD pixels, while providing improved photosensitivity and lower noise.
From the addition of (3) and (4), the output photocurrent [I.sub.[lambda]] is simply the superposition of the input photocurrent [I.sub.photon] = [I.sub.b] + [I.sub.w] generated by the absorption of the incident sunlight and the dark current
[I.sub.dark] = [I.sub.Rb] + [I.sub.Rw] due to the recombination processes:
Cells parameters like the short-circuit current density ([J.sub.SC]), opencircuit voltage ([V.sub.OC]), and maximum dark current
([J.sub.SC.sup.max]) are shown in Table 2.
Failure to subtract the dark current
from a flat-field frame will make the denominator incorrectly large, resulting in an improper correction to the raw image.