.png){kind=icon}
.png){kind=icon}
Return
Improved Energy Resolution in Amorphous Selenium X-Ray Detectors via Unipolar Charge Sensing
.png){kind=icon}
PRE
AI
A
Y
P
D
K
DOI：10.1109/led.2026.3707424.png)
.png){kind=icon}
Original request for help.png){kind=icon}
Share.png){kind=icon}
Save
Abstract
En 中文
This letter presents a unipolar charge-sensing amorphous selenium (a-Se) detector architecture addressing spectral limitations of conventional planar designs, where incomplete, depth-dependent electron collection leads to photopeak broadening and low-energy tailing. Detectors with <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$20~\upmu \text {m}$ </tex-math></inline-formula> pixel pitch were fabricated and characterized using pulse-height spectroscopy. Transient measurements indicate that unipolar sensing effectively suppresses the influence of slow electron transport on the detector response, reducing rise time from 0.6–<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$22.4~\upmu \text {s}$ </tex-math></inline-formula> to <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$150~\pm ~11$ </tex-math></inline-formula> ns. The proposed architecture achieves an energy resolution of 8.3 keV FWHM at 59.5 keV with suppressed spectral tailing, demonstrating a scalable pathway toward high-performance a-Se photon-counting detectors for applications such as spectral mammography.
Keywords:
Amorphous selenium
unipolar charge sensing structure
pulse height spectrum
rise-time
spectral imaging
Journal
IF:
4.5
Papers:
614
Citations:
2.3W
Organization
Cited Papers