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.
@article{arxiv.1505.01827,
title = {Crystal growth and detector performance of large size high-purity Ge crystals},
author = {Guojian Wang and Mark Amman and Hao Mei and Dongming Mei and Klaus Irmscher and Yutong Guan and Gang Yang},
journal= {arXiv preprint arXiv:1505.01827},
year = {2015}
}
Comments
22 pages, 11 figures, Accepted for publication in Materials Science in Semiconductor Processing