研究目的
To demonstrate the first spectroscopic alpha particle detection using CsPbBr3 detectors with asymmetric contacts and evaluate their transport properties for radiation detection applications.
研究成果
The CsPbBr3 detector with asymmetric contacts successfully resolved alpha particle and gamma ray spectra from 241Am, demonstrating excellent charge transport properties with electron and hole mobilities of 63 and 49 cm2/(V·s) and μτ products of 4.5×10?? and 9.5×10?? cm2/V, respectively. This work confirms the potential of CsPbBr3 for room-temperature radiation detection and suggests future optimizations to reduce trapping centers and improve stability.
研究不足
The detector showed temporal instability in dark current under forward bias, and there was an unexplained hump in the electron transport spectrum at low biases. Edge effects from incomplete electrode coverage caused low-energy tails in spectra. Electron trapping effects in CsPbBr3 are not fully understood and require further investigation.
1：Experimental Design and Method Selection:
The study used a Bridgman method for growing CsPbBr3 single crystals and fabricated detectors with asymmetric electrodes (In and Au) to achieve low dark current and stable performance. The design rationale was to enable spectroscopic detection of alpha particles and gamma rays.
2：Sample Selection and Data Sources:
High-quality CsPbBr3 single crystals were grown from the melt. The alpha particle source was a 1 μCi 241Am isotope, which emits 5.5 MeV alpha particles and 59.5 keV gamma rays.
3：5 MeV alpha particles and 5 keV gamma rays.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included a Keithley 6517B electrometer for I-V measurements, thermal evaporation system for electrode deposition (Au and In, ~70 nm thickness), and front-end electronics for spectrum recording. Materials included CsPbBr3 crystals, metal contacts (In, Au, Ga), carbon paste for connections, and the 241Am radiation source.
4：Experimental Procedures and Operational Workflow:
Crystals were cut, polished, and surface-treated. Electrodes were deposited via thermal evaporation. I-V curves were measured in dark conditions. Detector performance was assessed by irradiating with 241Am and 57Co sources, recording spectra under various biases, and analyzing transient pulses for rise time distributions.
5：Data Analysis Methods:
Energy resolution was calculated as FWHM/peak energy × 100%. Mobility-lifetime products (μτ) were derived using the single-carrier Hecht equation. Mobilities were estimated from rise time distributions using μ = d2/(tr·V), where d is thickness and tr is rise time. Statistical analysis of transient pulses was performed.
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