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

6 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

Publisher Copyright:
© 2022 Wiley-VCH GmbH.

Keywords

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

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