Dopant compensation in alloyed CH3NH3PbBr3-x Clx perovskite single crystals for gamma-ray spectroscopy

Haotong Wei, Dylan Desantis, Wei Wei, Yehao Deng, Dengyang Guo, Tom J. Savenije, Lei Cao, Jinsong Huang

Research output: Contribution to journalArticleScientificpeer-review

201 Citations (Scopus)

Abstract

Organic-inorganic halide perovskites (OIHPs) bring an unprecedented opportunity for radiation detection with their defecttolerance 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 -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 3.6×109 φcm. Alloying also increases the hole mobility to 560 cm2 V-1 s-1, yielding a high mobility-lifetime product of 1.8×10-2 cm2 V-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.

Original languageEnglish
Pages (from-to)826-833
Number of pages8
JournalNature Materials
Volume16
Issue number8
DOIs
Publication statusPublished - 1 Aug 2017

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