用于伽马射线光谱学的合金化CHNHPbBrCl钙钛矿单晶中的掺杂剂补偿
Dopant compensation in alloyed CHNHPbBrCl perovskite single crystals for gamma-ray spectroscopy.
作者信息
Wei Haotong, DeSantis Dylan, Wei Wei, Deng Yehao, Guo Dengyang, Savenije Tom J, Cao Lei, Huang Jinsong
机构信息
Department of Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA.
Nuclear Engineering Program, Department of Mechanical and Aerospace Engineering, Ohio State University, Columbus, Ohio 43210, USA.
出版信息
Nat Mater. 2017 Aug;16(8):826-833. doi: 10.1038/nmat4927. Epub 2017 Jul 3.
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. CHNHPbBr and CHNHPbCl are found to be p-type and n-type doped, respectively, whereas dopant-compensated CHNHPbBrCl alloy has over tenfold improved bulk resistivity of 3.6 × 10 Ω cm. Alloying also increases the hole mobility to 560 cm V s, yielding a high mobility-lifetime product of 1.8 × 10 cm V. The use of a guard ring electrode in the detector reduces the crystal surface leakage current and device dark current. A distinguishable Cs energy spectrum with comparable or better resolution than standard scintillator detectors is collected under a small electric field of 1.8 V mm at room temperature.
有机-无机卤化物钙钛矿（OIHPs）凭借其耐缺陷特性、大的迁移率-寿命乘积以及从溶液中简单的晶体生长方式，为辐射探测带来了前所未有的机遇。在此，我们报道了在合金化的OIHP单晶中进行掺杂剂补偿，以克服器件噪声和电荷收集方面的限制，从而能够在室温下收集γ射线光谱。发现CHNHPbBr和CHNHPbCl分别为p型和n型掺杂，而掺杂剂补偿的CHNHPbBrCl合金的体电阻率提高了十倍以上，达到3.6×10 Ω·cm。合金化还将空穴迁移率提高到560 cm² V⁻¹ s⁻¹，产生了1.8×10⁻³ cm² V的高迁移率-寿命乘积。在探测器中使用保护环电极可降低晶体表面漏电流和器件暗电流。在室温下1.8 V mm的小电场下，收集到了具有与标准闪烁体探测器相当或更好分辨率的可区分的Cs能谱。
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