May 24 – 28, 2021
America/Vancouver timezone

Quantum Dot Based Scintillators: A New Type of Sensor for Particle Physics

May 25, 2021, 5:00 AM
30m
Poster Sensors: Solid-state position sensors Sensor Posters: SS Position

Speaker

Allan Minns (SUNY Polytechnic Institute)

Description

Development of semiconductor technology has enabled engineering of ultrafast, high-yield, and radiation-tolerant quantum dot (QD) based scintillation materials with sub-nanosecond emission time and light yield > 2x10^5 photons/MeV. Such materials could be very attractive for various HEP applications, particularly for fast timing and low-mass tracking detectors. We present results on a scintillation detector based on self-assembled InAs QDs grown with molecular beam epitaxy and embedded into GaAs bulk. The detector consists of a 25 µm thick scintillator with an InGaAs photodiode grown directly on the scintillator. Signals measured using 5 MeV α-particles correspond to a light collection efficiency of ~13% with a measured scintillation time of ~500 ps, making this system the fastest high-yield scintillating material reported so far. Furthermore, strong carrier localization results in a radiation hardness that significantly exceeds that of bulk GaAs.

Funding information National Science Foundation under award DMR-1511708637 and the U.S. Department of Energy, Office of Science under Award Number DE-SC0019031

Primary author

Allan Minns (SUNY Polytechnic Institute)

Co-authors

Mr Tushar Mahajan (SUNY Polytechnic Institute) Dr Vadim Tokranov (SUNY Polytechnic Institute) Dr Michael Yakimov (SUNY Polytechnic Institute) Dr Pavel Murat (Fermi National Accelerator Laboratory) Dr Michael Hedges (Purdue University) Prof. Serge Oktyabrsky (SUNY Polytechnic Institute)

Presentation materials