semiconductor-based radiation detector

If you want to plot some nice X-ray spectra, download and unzip http://linux.fjfi.cvut.cz/~madlenka/medphys/CDROM.ZIP

위의 두 그래프는 PL(Photoluminescene)과 PR (Photoreflectance)을 이용해 측정한 에너지 간격이고, 아래 두 그래프는 NIR (near IR) transmittance를 이용해 측정한 데이터 들이다. 실제로 PL과 PR을 이용해 측정한 데이터가 나머지 두 데이터에 비해 보다 정확한 결과로 간주되고 있다. NIR투과도의 경우, 대략 0.006~0.007 eV의 낮은 에너지 값을 보여주는데 이는 cut-on wavelength을 결정하는 차이에서 발생된다고 사려된다.

Resistivity map of CdZnTe slab taken by contact-less resistivity measurement (CoReMa). Large differences in resistivity along grain boundaries, and vertical and horizontal direction are clearly seen.

Phase diagram of CdMnTe, published by R. Triboulet. CdMnTe has slightly low synthesis temperature than CdZnTe. But, peritectic reaction at 1155 C results in crystals of poor quality, containing cavities, grain boundaries and precipitates of cubic MnTe2. Peritectic reaction is a reaction where a solid phase and liquid phase will together form a second solid phase at a particular temperature and c..

Capacitance-Voltage measurement gives the information on the depletion width of pn or Schottky detector.

Scattering by lattice waves: Scattering by lattice waves includes the absorption or emission of either acoustical or optical phonons. Since the density of phonons in a solid increases with temperature, the scattering time due to this mechanism will decrease with temperature as will the mobility. Theoretical calculations reveal that the mobility in non-polar semiconductors, such as silicon and ge..

Optimization of CdMnTe growth condition provides nearly single grain ingot. This ingot was grown by vertical Bridgman method. Every part is single crystal except the tip region.

40-mm diameter CZT single crystal wafer grown by THM. Mobility-lifetime products is .

Choice of the dimensions of the Te zone and control of its interface shape are considered essential in determining the crystallinity. For example, for the growth of rods 10 mm in diameter and ~60 mm long, Schoenholtz demonstrate that a 3 mm wide Te zone generates polycrystalline boules, the grain size being 0.5 of the diameter of the rod. Using of a 4 or 6 mm wide zone generated sing crystals ro..

Herbert B. Michaelson J. Appl. Phys. 48, 4729 (1977); doi:10.1063/1.323539 (5 pages)

Indium iodide is new emerging X- and gamma-ray detector material. It have basic requirements such as high bandgap, high average atomic number, and high mobility-lifetime product. Commercially availbe InI material is just 4-5N purity. Notable improvement in gamma-response observed in InI detector grown with 50 times zone-refined InI source. The photo clearly indicates the effectiveness of zone-re..