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In recent years, the performance of Scientifc Complementary Metal OxideSemiconductor (sCMOS) sensors has been improved signifcantly. Compared with CCDsensors, sCMOS sensors have various advantages, making them potentially betterdevices for optical and X-ray detection, especially in time-domain astronomy.After a series of tests of sCMOS sensors, we proposed a new dedicatedhigh-speed, large-format X-ray detector in 2016 cooperating with Gpixel Inc.This new sCMOS sensor has a physical size of 6 cm by 6 cm, with an array of4096 by 4096 pixels and a pixel size of 15 um. The frame rate is 20.1 fps undercurrent condition and can be boosted to a maximum value around 100 fps. Theepitaxial thickness is increased to 10 um compared to the previous sCMOSproduct. We show the results of its frst taped-out product in this work. Thedark current of this sCMOS is lower than 10 e/pixel/s at 20C, and lower than0.02 e/pixel/s at -30C. The Fixed Pattern Noise (FPN) and the readout noise arelower than 5 e in high-gain situation and show a small increase at lowtemperature. The energy resolution reaches 180.1 eV (3.1%) at 5.90 keV forsingle-pixel events and 212.3 eV (3.6%) for all split events. The continuousX-ray spectrum measurement shows that this sensor is able to response to X-rayphotons from 500 eV to 37 keV. The excellent performance, as demonstrated fromthese test results, makes sCMOS sensor an ideal detector for X-ray imaging andspectroscopic application.

X-ray performance of a customized large-format scientifc CMOS detector