4 years ago

Dopant compensation in alloyed CH3NH3PbBr3−xClx perovskite single crystals for gamma-ray spectroscopy

Dopant compensation in alloyed CH3NH3PbBr3−xClx perovskite single crystals for gamma-ray spectroscopy
Dylan DeSantis, Jinsong Huang, Tom J. Savenije, Haotong Wei, Wei Wei, Yehao Deng, Lei Cao, Dengyang Guo
Organic–inorganic halide perovskites (OIHPs) bring an unprecedented opportunity for radiation detection with their defect-tolerance nature, large mobility–lifetime product, and simple crystal growth from solution. Here we report a dopant compensation in alloyed OIHP single crystals to overcome limitations of device noise and charge collection, enabling γ-ray spectrum collection at room temperature. CH3NH3PbBr3 and CH3NH3PbCl3 are found to be p-type and n-type doped, respectively, whereas dopant-compensated CH3NH3PbBr2.94Cl0.06 alloy has over tenfold improved bulk resistivity of 3.6 × 109cm. Alloying also increases the hole mobility to 560cm2V−1s−1, yielding a high mobility–lifetime product of 1.8 × 10−2cm2V−1. The use of a guard ring electrode in the detector reduces the crystal surface leakage current and device dark current. A distinguishable 137Cs energy spectrum with comparable or better resolution than standard scintillator detectors is collected under a small electric field of 1.8Vmm−1 at room temperature.

Publisher URL: http://dx.doi.org/10.1038/nmat4927

DOI: 10.1038/nmat4927

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