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Related Experiment Video

Updated: Jun 7, 2026

Low-energy Cathodoluminescence for (Oxy)Nitride Phosphors

Low-energy Cathodoluminescence for (Oxy)Nitride Phosphors

Published on: November 15, 2016

A solid-state amorphous selenium avalanche technology for low photon flux imaging applications.

M M Wronski¹, W Zhao, A Reznik

¹Department of Medical Biophysics, Sunnybrook Health Sciences Centre, University of Toronto, Toronto, Ontario M4N 3M5, Canada. matt.wronski@utoronto.ca

Medical Physics

|October 23, 2010

Summary

This study demonstrates a novel solid-state amorphous selenium photoreceptor, HARP-DRL, capable of high internal avalanche gain for low photon flux imaging. This technology is crucial for advancing photon counting and photon-starved imaging applications.

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Published on: July 17, 2015

Area of Science:

Solid-state physics
Imaging technology
Materials science

Background:

Low photon flux imaging presents challenges for traditional detectors.
Amorphous selenium photoreceptors offer potential for high internal gain.
Developing practical solid-state solutions is key for advanced imaging systems.

Purpose of the Study:

To investigate the feasibility of a novel solid-state technology for low photon flux imaging.
To evaluate an amorphous selenium photoreceptor with voltage-controlled avalanche multiplication gain.
To determine if this photoreceptor can provide sufficient internal gain for diagnostic imaging.

Main Methods:

Investigated a novel avalanche photoreceptor: HARP-DRL (high-gain avalanche rushing photoconductor integrated with a distributed resistance layer).
Measured avalanche gain and leakage current characteristics of the HARP-DRL photoreceptor.
Fabricated the device by sandwiching the HARP-DRL between two electrodes.

Main Results:

The HARP-DRL photoreceptor sustains very high electric field strengths without electrical breakdown.
Achieved avalanche multiplication gains as high as 10^4.
Demonstrated a very low leakage current (< or = 20 pA/mm^2).

Conclusions:

This work presents the first experimental demonstration of a solid-state amorphous photoreceptor with sufficient internal avalanche gain.
The HARP-DRL technology is suitable for photon counting and photon-starved imaging applications.
This advancement has significant implications for diagnostic imaging systems.