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Next-generation X-ray observatories, such as the Lynx X-ray ObservatoryMission Concept or other similar concepts in the coming decade, will requiredetectors with high quantum efficiency (QE) across the soft X-ray band toobserve the faint objects that drive their mission science objectives. HybridCMOS Detectors (HCDs), a form of active-pixel sensor, are promising candidatesfor use on these missions because of their fast read-out, low powerconsumption, and intrinsic radiation hardness. In this work, we present QEmeasurements of a Teledyne H2RG HCD, performed using a gas-flow proportionalcounter as a reference detector. We find that this detector achieves high QEacross the soft X-ray band, with an effective QE of $94.6 \pm 1.1 \%$ at the MnK$\alpha$/K$\beta$ energies (5.90/6.49 keV), $98.3 \pm 1.9 \%$ at the AlK$\alpha$ energy (1.49 keV), $85.6 \pm 2.8 \%$ at the O K$\alpha$ energy (0.52keV), and $61.3 \pm 1.1 \%$ at the C K$\alpha$ energy (0.28 keV). These valuesare in good agreement with our model, based on the absorption of detectorlayers. We find similar results in a more restrictive analysis considering onlyhigh-quality events, with only somewhat reduced QE at lower energies.

Measuring the Soft X-Ray Quantum Efficiency of a Hybrid CMOS Detector