Related Experiment Video
Updated: Jun 1, 2025
Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells
Published on: March 19, 2017
Novel Self-Powered Sensitive X-Ray Detection Crystal Bi2Mo0.36W1.64O9 with Effective Functional Motif Coupling in a
Lishan Liu1, Hanyue Zhou1, Jingquan Liu1
1School of Materials Science and Engineering, Linyi University, West Side of the Northern Section of Industrial Avenue, Linyi, 276000, China.
Abstract:
The demand for medical imaging with reduced patient dosage and higher resolution is growing, driving the need for advanced X-ray detection technologies. This paper proposes a design paradigm for X-ray detection semiconductors by coupling constituent motifs through crystal structure engineering. The study introduces a strongly anisotropic Aurivillius-type quasi-2D perovskite structure, combining [Bi2O2]2+ groups with stereochemically active lone pair electrons (SCALPEs) and [W/Mo2O7]2- anionic groups, enabling enhanced X-ray Compton scattering and self-powered capabilities through local electric field ordering. This results in the first self-powered Bi-based tungstate Bi2Mo0.36W1.64O9 (BMWO) X-ray detector, achieving a record self-powered sensitivity of 381 µC Gy-1 cm-2. Additionally, the study demonstrates the imaging capability of a Bi-based perovskite X-ray detector operating in self-driven mode. The work highlights BMWO as a promising candidate for stable direct detection imaging and validates the material design strategy that leverages the large anisotropy of quasi-2D structures for sensitive and self-powered detection.
Related Concept Videos
02:18X-ray Crystallography
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...