Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Publication date: 6th February 2020
Radiation detectors are currently in use in monitoring and safety applications in healthcare, industrial applications, nuclear power plants, homeland security and defence, in environmental monitoring and academic research. Availability of semiconductors materials with distinctive characteristics required for an efficient high-energy-photon detection, especially with high atomic numbers (high-Z), in sufficiently large, single-crystalline forms, which would also be both chemically and mechanically robust, is still very limited. Recently metal halide perovskite (MHP) were found to meet all key requirements for high-energy radiation detection. In particular, the emerging technologies of growing large metal halide MHP single crystals (SCs) weighing more than 100 g from solutions, concomitant with fast mobilities (m) and long lifetimes (t) of photo-excited charges, opens new avenues for applications of MHP SCs in designing ultrasensitive, low cost detectors of high-energy radiation.
Here, we report fabrication and characterization of sensitive and operationally stable γ-radiation detectors based on a combination of large SCs of an archetypal MHP, methylammonium lead tribromide (MAPbBr3), with carbon electrodes. The herein fabricated devices detect γ-radiation dose rates in the range of 0.05 to 1.22 Gy h-1 from a 60Co source and exhibit photocurrents up to 100 nA. Fast responses of these detectors were recorded for different distances from the source and are in a very good agreement with the commercially available and calibrated devices for gamma dose-rate measurements. Finally, the devices were exposed to γ-radiation with the dose-rate of 1.22 Gy h-1 under ambient and operational conditions at room temperature for over 100 hours. No marked degradation or deterioration of the device performance was observed during this long-term testing. The origin of the excellent radiation tolerance stems from the intrinsic structural plasticity of organic-inorganic halide perovskites, a fast ion migration accompanying a reversible component phase separation based on the defect-healing process at the nanoscale.
This work was supported by the Swiss National Science Foundation (No. 513733) and the ERC advanced grant “PICOPROP” (Grant No. 670918).
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