3D Microstructured Inorganic Perovskite Materials for Thermal Neutron Detection
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jan 07, 2022
- Source ID
- 10.1002/admt.202100956
Entities
People
- J. A. Caraveo-Frescas
- Leunam Fernandez‐izquierdo
- Manuel A. Quevedo‐lopez
- Martin Gregorio Reyes‐Banda
Organizations
- Air Force Office of Scientific Research
- University of Texas at Dallas