Highly efficient photon detection systems for noble liquid detectors based on perovskite quantum dots

Area of Science:

• Physics
• Materials Science
• Detector Technology

Background:

• Photon detection systems (PDS) are crucial for noble liquid detectors in high energy physics (HEP) and dark matter searches.
• Current organic wavelength shifters, like TPB, have limitations in long-term stability and efficiency.
• Vacuum ultraviolet (VUV) light from liquid argon (LAr) and liquid xenon (LXe) needs shifting for detection by photodetectors like SiPMs.

Purpose of the Study:

• To investigate inorganic perovskite cesium lead bromide (CsPbBr3) quantum dots (QDs) as efficient wavelength shifters for PDS.
• To evaluate the performance enhancement of CsPbBr3 QDs compared to traditional materials.
• To demonstrate scalable fabrication methods for large-area PDS using QDs.

Main Methods:

• Fabrication of PDS using CsPbBr3 quantum dots.
• Measurement of absolute photoluminescence quantum yield (PLQY).
• Comparison of SiPM signal enhancement with TPB-based PDS.
• Demonstration of large-area substrate deposition using solution-based techniques.

Main Results:

• CsPbBr3 QD-based PDS achieved an absolute PLQY exceeding 70%.
• SiPM signal enhancement was up to 3 times greater than with TPB-based PDS.
• QD emission spectra were optimized for SiPM quantum efficiency.
• Scalable, low-cost solution-based deposition techniques were demonstrated for large-area PDS.

Conclusions:

• CsPbBr3 quantum dots represent a highly efficient and stable alternative for wavelength shifting in noble liquid detectors.
• QD-based PDS offer significant performance improvements for HEP and dark matter experiments.
• The developed scalable fabrication method enables meter-scale PDS, paving the way for widespread application.