  We report on the characterization of four Teledyne Imaging Systems HAWAII
Hybrid Si CMOS detectors designed for X-ray detection. Three H1RG detectors
were studied along with a specially configured H2RG. Read noise measurements
were performed, with the lowest result being 7.1 e- RMS. Interpixel capacitive
crosstalk (IPC) was measured for the three H1RGs and for the H2RG. The H1RGs
had IPC upper limits of 4.0 - 5.5 % (up & down pixels) and 8.7 - 9.7 % (left &
right pixels), indicating a clear asymmetry. Energy resolution is reported for
two X-ray lines, 1.5 & 5.9 keV, at multiple temperatures between 150 - 210 K.
The best resolution measured at 5.9 keV was 250 eV (4.2 %) at 150 K, with IPC
contributing significantly to this measured energy distribution. The H2RG, with
a unique configuration designed to decrease the capacitive coupling between
ROIC pixels, had an IPC of 1.8 +/- 1.0 % indicating a dramatic improvement in
IPC with no measurable asymmetry. We also measured dark current as a function
of temperature for each detector. For the detector with the lowest dark
current, at 150 K, we measured a dark current of 0.020 +/- 0.001 (e- sec-1
pix-1). There is also a consistent break in the fit to the dark current data
for each detector. Above 180 K, all the data can be fit by the product of a
power law in temperature and an exponential. Below 180 K the dark current
decreases more slowly; a shallow power law or constant must be added to each
fit, indicating a different form of dark current is dominant in this
temperature regime. Dark current figures of merit at 293 K are estimated from
the fit for each detector.
