Analyses of crystal growth, optical, electrical, thermal and mechanical properties of an excellent detector-grade Cd0.9Mn0.1Te: V crystal

Abstract

A high-quality cadmium manganese tellurium (cd 0.9 Mn 0.1 te: V or VcMt) crystal was successfully grown via modified Te solution vertical Bridgman method with vanadium doping. The crystal structure and quality were evaluated by powder X-ray diffraction analysis. An infrared transmission spectroscope measured the transmittance of the crystal at 64%, which would suggest that the grown crystal possessed high purity and crystallinity. Ultraviolet-visible-near-infrared spectroscopy analysis obtained the forbidden band width of approximately 1.577 eV. The current-voltage test indicated that the VCMT crystal had a high resistivity of 2.07 × 10 10 Ω·cm. Mechanical properties were measured by a Vickers microhardness tester. Crack surface morphology around the indentation was recorded. Furthermore, mechanical properties, such as microhardness, fracture toughness, brittleness index and yield strength were investigated and discussed. The thermal stability of the VCMT single crystal was determined by thermogravimetric analysis. A VCMT detector was fabricated with planar configuration structure, which showed a resolution of 11.62% of the 241 Am at 59.5 keV peak.

Halide Perovskites and Their Derivatives for Efficient, High‐Resolution Direct Radiation Detection: Design Strategies and Applications

“…[ 35 ] The attenuation of radiation is proportional to $$Z_{{{\rm av}}}^n\ {A}^{ - 1}{E}^{ - 3}$$, where $$Z_{{{\rm av}}}$$ is the average atomic number of the elements present in the material, 4 ≤ n ≤ 5 for photoelectric absorption, [ 36 ] A the atomic mass and E the photon energy. [ 28 ] As such, imaging with ionizing radiation allows for contrast of matter based on $$Z_{{{\rm av}}}$$ and A , and is therefore widely used in non‐invasive medical diagnostics ( e.g ., to image tissues and bones, see Figure 1c for an example image), [ 37,38 ] non‐destructive inspection of industrial goods (such as microprocessors), [ 39 ] homeland security, oil exploration, and space exploration, among many other possibilities. [ 31,33,40 ] Furthermore, ionizing radiation is widely used in materials research ( e.g ., crystallography, X‐ray photoemission spectroscopy, X‐ray absorption spectroscopy), astronomy, [ 41 ] and the detection of radioactive waste through γ‐ray spectrometry.…”