纳米掺杂聚合物基x射线图像探测器的灵敏度

2016 9th International Conference on Electrical and Computer Engineering (ICECE) Pub Date : 2016-12-01 DOI:10.1109/ICECE.2016.7853879

Naimul Hassan, S. A. Mahmood

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引用次数: 0

摘要

研究了掺杂氧化铋(Bi2O3)纳米粒子的聚三芳胺(PTAA)直接转换x射线图像探测器的x射线灵敏度。利用COMSOL Multiphysics 5.0软件，求解了深阱存在时考虑载流子漂移的连续性方程。文中还考虑了漂移载流子与光导体层上非均匀电场之间的复合。考虑了电场依赖载流子迁移率的Poole-Frenkel机制。在10V/µm的外加电场下，x射线的灵敏度为1.3295µC/cm2R。计算出的灵敏度与市售的非晶硒(a-Se)基直接转换x射线图像探测器的灵敏度进行了比较。

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Sensitivity of a nanodoped polymer based X-ray image detector

The X-ray sensitivity of direct conversion X-ray image detectors based on poly(triarylamine) (PTAA) doped with bismuth oxide (Bi2O3) nanoparticle is determined for mammography. Using COMSOL Multiphysics 5.0, the continuity equations are solved considering drift of charge carriers in the presence of deep traps. The recombination between drifting charge carriers and nonuniform electric field across the photoconductor layer is also considered. Poole-Frenkel mechanism has been considered for electric field dependent mobility of charge carriers. A very promising X-ray sensitivity of 1.3295µC/cm2R has been found at an applied electric field of 10V/µm. The calculated sensitivity has been compared with that of the commercially available amorphous selenium (a-Se) based direct conversion X-ray image detector.

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2016 9th International Conference on Electrical and Computer Engineering (ICECE)

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