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Efficient Eco-Friendly Flexible X-ray Detectors Based on Molecular Perovskite
Qingyue Cui1,2,3, Nuo Bu2, Xinmei Liu2
1Department of Chemical Physics; Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), University of Science and Technology of China (USTC), Hefei 230026, People's Republic of China.
Nano Letters
|July 12, 2022
Summary
A novel molecular perovskite, DABCO-CsBr3, enables flexible X-ray detectors. This material offers eco-friendliness and mechanical robustness for advanced wearable electronics and ionizing radiation detection.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Device Engineering
Background:
- Next-generation wearable electronics demand mechanically robust materials.
- Molecular perovskites offer eco-friendliness, low cost, and light weight, but flexibility is crucial for practical applications.
- Existing molecular perovskites (A(NH4)X3) and metal halide perovskites (ABX3) have limitations.
Purpose of the Study:
- To design a flexible X-ray detector utilizing a novel molecular perovskite.
- To bridge the gap between metal-free molecular perovskites and conventional metal halide perovskites.
- To explore the potential of DABCO-CsBr3 for high-performance ionizing radiation detection.
Main Methods:
- Synthesis and characterization of the novel molecular perovskite, DABCO-CsBr3 (N-N'-diazabicyclo[2.2.2]octonium cesium tribromide).
- Fabrication of a flexible X-ray detector using a DABCO-CsBr3/poly(vinylidene fluoride) composite.
- Evaluation of detector performance, including dark current, ion migration, and sensitivity.
Main Results:
- DABCO-CsBr3 exhibits a unique band structure, inheriting properties from A(NH4)X3 while possessing stronger stopping power.
- The material demonstrates low dark current, minimal ion migration, and an efficient mobility-lifetime (μτ) product, crucial for detector performance.
- A flexible X-ray detector achieved a sensitivity of 106.7 μC Gyair-1 cm-2.
Conclusions:
- DABCO-CsBr3 represents a significant addition to the molecular perovskite family.
- This novel material shows great promise for developing eco-friendly and flexible ionizing radiation detectors.
- The findings highlight the potential of molecular perovskites for next-generation wearable optoelectronic devices.
