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Published on: September 8, 2017
Low Dimensional, Metal-Free, Hydrazinium Halide Perovskite-Related Single Crystals and Their Use as X-Ray Detectors
Xin Song1,2, Hagai Cohen3, Jun Yin4
1Key Laboratory of Applied Surface and Colloid Chemistry, National Ministry of Education, Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology, Institute for Advanced Energy Materials, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710119, P. R. China.
New metal-free halide perovskites (MFHaPs) using hydrazinium cations show promise as X-ray detectors. These materials exhibit high sensitivity and stability, offering a low-toxicity alternative for optoelectronics and radiation detection.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Optoelectronics
Background:
- Metal-free halide perovskites (MFHaPs) are attractive for optoelectronics due to low toxicity and versatility.
- Research has primarily focused on ammonium-based MFHaPs, with limited exploration of alternative cations at the B-site.
- The A2+B+X-3 structure is common, but variations are being investigated for novel properties.
Purpose of the Study:
- To synthesize and characterize novel MFHaP-related single crystals incorporating hydrazinium (N2H5+) at the B-site.
- To investigate the structural, optical, and electronic properties of these new materials.
- To evaluate their performance as X-ray detectors.
Main Methods:
- Synthesis of single crystals: DABCO-N2H5-X3 (X=Br, I) and (DABCO)3-N2H5(NH4)2Cl9.
- Structural analysis and characterization of the perovskite-like, one-dimensional, edge-connected framework.
- Optical and band structure measurements.
- Fabrication and testing of X-ray detector devices.
Main Results:
- Successful synthesis of three novel MFHaP-related single crystals with hydrazinium cations.
- Crystals exhibit a perovskite-like, one-dimensional, edge-connected structure.
- X-ray detectors demonstrated excellent photoresponsivity, stability, and low background noise.
- High sensitivity (1143 ± 10 µC Gyair-1 cm-2) and a low detection limit (2.68 µGy s-1 at 10 V) were achieved.
- Long carrier lifetimes attributed to a large semi-gap.
Conclusions:
- Hydrazinium-based MFHaPs offer a promising alternative to ammonium-based counterparts for X-ray detection.
- Enhanced stability may stem from stronger hydrogen bonding in N2H5+ compounds.
- These materials hold potential for advanced, low-toxicity optoelectronic and radiation detection applications.
