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Hard Radiation Detection from the Selenophosphate Pb2P2Se6

机译：硒代磷酸硒Pb2P2Se6的硬辐射检测

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摘要

The heavy metal selenophosphate, Pb2P2Se6, is a promising new material for cost-effective X-ray/-ray detection. Crystal boules of Pb2P2Se6 up to 25 mm in length and 15 mm in diameter are grown by a vertical Bridgman method. They are cut and processed into size-appropriate wafers for physical, photo-transport property studies, as well as -ray detector testing. The material is a semiconductor with an indirect bandgap of 1.88 eV and has electrical resistivity in the range of 1 x 10(10) cm. Pb2P2Se6 single crystal samples display a significant photoconductivity response to optical, X-ray, and -ray radiation. When tested with a Co-57 -ray source, Pb2P2Se6 crystals show spectroscopic response and several generated pulse height spectra resolving the 122.1 and 136.5 keV Co-57 radiation. The mobility-lifetime product of Pb2P2Se6 is estimated to be approximate to 3.5 x 10(-5) cm(2) V-1 for electron carriers. The Pb2P2Se6 compound melts congruently at 812 degrees C and has robust chemical/physical properties that promise low cost bulk production and detector development.
机译：重金属硒磷酸盐Pb2P2Se6是一种有前景的新型材料，可用于具有成本效益的X射线/射线检测。通过垂直布里奇曼法生长长度为25 mm，直径为15 mm的Pb2P2Se6晶体块。将它们切割并加工成尺寸合适的晶圆，以进行物理，光传输特性研究以及射线探测器测试。该材料是一种半导体，其间接带隙为1.88 eV，电阻率在1 x 10（10）cm范围内。 Pb2P2Se6单晶样品对光，X射线和X射线辐射显示出显着的光电导响应。当使用Co-57射线源进行测试时，Pb2P2Se6晶体显示出光谱响应，并生成了多个脉冲高度光谱，可分辨122.1和136.5 keV的Co-57辐射。对于电子载流子，Pb2P2Se6的迁移寿命终产物估计约为3.5 x 10（-5）cm（2）V-1。 Pb2P2Se6化合物在812摄氏度时会完全熔化，并具有强大的化学/物理性质，有望实现低成本的批量生产和检测器开发。

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