3D Microstructured Inorganic Perovskite Materials for Thermal Neutron Detection

Jesus A. Caraveo-Frescas*, Martin G. Reyes-Banda, Leunam Fernandez-Izquierdo, Manuel A. Quevedo-Lopez

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

A combination of novel techniques such as a solvent-free thin-film deposition, perovskite patterning, and 10B back-fill technique enables the high neutron detection efficiency in a perovskite-based microstructured thermal neutron detector. High-efficiency cesium lead bromide (CsPbBr3) perovskite-based microstructured detectors are demonstrated here. Trenches up to 10 µm deep are etched into the CsPbBr3 thin films using a novel dry etching process involving a combination of HBr and Ar plasma. The microstructured diodes are then backfilled with isotopically enriched boron as neutron conversion material via a sedimentation process to preserve the perovskite integrity. The fabricated microstructured CsPbBr3 thermal neutron detectors show an efficiency of 4.3%. This represents >1.2x efficiency improvement over planar silicon (3.5%) and >2x efficiency improvement over planar CsPbBr3 (2.1%) detectors, respectively. More importantly, gamma-ray discrimination of 107 is measured in CsPbBr3-based microstructured neutron detectors.

Original languageEnglish
Article number2100956
JournalAdvanced Materials Technologies
Volume7
Issue number6
DOIs
StatePublished - Jun 2022

Bibliographical note

Funding Information:
The authors would like to thank Dr. Siddartha S. Nandagopala Krishnan for conducting the experiments as well as the sponsor, nanoholdings, for facilitating this research. This work was partially supported by Air Force Office of Scientific Research Grants FA9550-519 18-1-0019 and NSF/PFI:AIR TT 1701192. Dr. Fernandez-Izquierdo thanks CONICYT-ANID for FONDECYT project number 3210399 (LFI).

Funding Information:
The authors would like to thank Dr. Siddartha S. Nandagopala Krishnan for conducting the experiments as well as the sponsor, nanoholdings, for facilitating this research. This work was partially supported by Air Force Office of Scientific Research Grants FA9550‐519 18‐1‐0019 and NSF/PFI:AIR TT 1701192. Dr. Fernandez‐Izquierdo thanks CONICYT‐ANID for FONDECYT project number 3210399 (LFI).

Publisher Copyright:
© 2022 Wiley-VCH GmbH.

Keywords

  • Monte-Carlo simulations
  • etching
  • neutron detection
  • perovskites

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