The working principle of hybrid perovskite gamma-ray photon counter
| Autor: | Hsinhan Tsai, Kasun Fernando, Wanyi Nie, Jon K. Baldwin, Aditya D. Mohite, Sergei Tretiak, Fangze Liu, Duc Vo, Michael Yoho, Jeremy Tisdale, Shreetu Shrestha |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Photon business.industry Astrophysics::High Energy Astrophysical Phenomena Mechanical Engineering Detector Gamma ray 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Mechanics of Materials Optoelectronics General Materials Science Work function 0210 nano-technology business Spectroscopy Single crystal Dark current Perovskite (structure) |
| Zdroj: | Materials Today. 37:27-34 |
| ISSN: | 1369-7021 |
| DOI: | 10.1016/j.mattod.2020.02.022 |
| Popis: | Gamma-ray spectroscopy that quantifies the gamma-ray energies is a critical technology widely needed in astrophysics, nuclear material detection and medical treatment. The key is to precisely count gamma-ray photons using sensitive detectors. In this paper, we investigate the operational principles of chlorine-doped methylammonium lead tribromide (MAPbBr3−xClx) perovskite single crystal detectors that can efficiently count gamma-ray photon events with electrical pulses. Specifically, we find the main dark current originates from the thermally activated electron injection from the impurities, and using high work function contacts can block out the dark noise thus allows for efficient pulse collection at higher electrical fields ∼500 V/cm. As a result, we observe strong electrical pulses when exposing the detector under radioactive sources emitting gamma-ray photons at various energies. Our results also reveal the fundamental issues that prevent the reliable observation of photo-electric peak. This work suggest pathway towards energy resolved gamma-ray spectroscopy using perovskite crystal detectors. |
| Databáze: | OpenAIRE |
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