Crystal growth and detector performance of large size High-purity Ge crystals

 High-purity germanium crystals approximately 12 cm in diameter were grown in a hydrogen atmosphere using the Czochralski method. The dislocation density of the crystals was determined to be in the range of 2000–4200 cm⁻², which meets a requirement for use as a radiation detector. The axial and radial distributions of impurities in the crystals were measured and are discussed. A planar detector was also fabricated from one of the crystals and then evaluated for electrical and spectral performance. Measurements of gamma-ray spectra from Cs-137 and Am-241 sources demonstrate that the detector has excellent energy resolution.

Keywords

• Czochralski method; 
• Semiconducting germanium; 
• Gamma-ray detector
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• Source: PAM-XIAMEN
  
  
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