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 CH₃NH₃PbBr_2.94Cl_0.06 alloy has over tenfold improved bulk resistivity of 3.6 × 10⁹ Ω cm. 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 1.8 V mm⁻¹ at room temperature.

中文翻译：

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合金CH3NH3PbBr3-xClx钙钛矿单晶中的掺杂剂补偿，用于γ射线光谱分析

有机-无机卤化物钙钛矿（OIHP）具有耐缺陷的性质，大的迁移寿命产品以及从溶液中生长的简单晶体，为放射线检测带来了前所未有的机会。在这里，我们报告了合金化OIHP单晶中的掺杂剂补偿，以克服器件噪声和电荷收集的局限性，从而能够在室温下收集γ射线光谱。发现CH ₃ NH ₃ PbBr ₃和CH ₃ NH ₃ PbCl ₃分别是p型和n型掺杂的，而掺杂剂补偿的CH ₃ NH ₃ PbBr _2.94 Cl _0.06合金具有超过十倍提高3.6×10体电阻率⁹ Ω厘米。合金化还将空穴迁移率提高到560 cm ² V ^-1 s ^-1，从而产生1.8×10 ^-2 cm ² V ^-1的高迁移率-寿命乘积。在检测器中使用保护环电极可减少晶体表面泄漏电流和器件暗电流。在室温下，在1.8 V mm ^-1的小电场下，可收集到可分辨的¹³⁷ Cs能谱，其分辨能力与标准闪烁体检测器相当或更好。