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Cadmium Zinc Telluride and Cadmium Telluride are the detector materials ofchoice for the detection of X-rays in the X-ray energy band E >= 5keV withexcellent spatial and spectral resolution and without cryogenic cooling. Owingto recent breakthroughs in grazing incidence mirror technology, next-generationhard X-ray telescopes will achieve angular resolution between 5 and 10 arcseconds - about an order of magnitude better than that of the NuSTAR hard X-raytelescope. As a consequence, the next generation of X-ray telescopes willrequire pixelated X-ray detectors with pixels on a grid with a lattice constantof <= 250um. Additional detector requirements include a low energy threshold ofless than 5keV and an energy resolution of less than one keV. The sciencedrivers for a high angular-resolution X-ray mission include studies andmeasurements of black hole spins, the cosmic evolution of super-massive blackholes, active galactic nuclei feedback, and the behaviour of matter at veryhigh densities. In this contribution, we report on our R&D studies with thegoal to optimise small-pixel Cadmium Zinc Telluride and Cadmium Telluridedetectors.

Optimization of <= 200 um pitch CZT detectors for future high-resolution X-ray instrumentation in astrophysics