Metal halide perovskite single crystals (SCs) have demonstrated significant potential for X-ray detection. However, the current drift of perovskite detectors has been the primary obstacle for commercialization. Here, we investigate the current drift of perovskite devices using the pulsed voltage (PV) method and establish stable PV radiation detectors based on MAPbBr₃ SC. The trend of current drift is identified to be dependent on waiting time with the negligible disturbance of carriers in PV measurements, which is influenced by the competition effect between ionic polarization and defect proliferation. Furthermore, an aluminum-bathocuproine (Al-BCP) chelating electrode is used to shorten the waiting time, which is vital for the practicability of X-ray detectors based on the PV method. The synergistic effect of the PV method and chelating interface in MAPbBr₃ SC detectors exhibits double records under 100 V, including a sensitivity of 1.13 × 10⁵ μC Gy_air^–1 cm^–2 and a detection limit of 0.7 nGy_air s^–1. The photon-generated carriers under continuous illumination fill defects, resulting in an obvious photoconductive gain generation. This work enhances further understanding of current drift in perovskite devices and shows the tremendous application potential of perovskite X-ray detectors.

中文翻译：

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了解使用脉冲电压实现稳定钙钛矿 X 射线探测器的电流漂移


金属卤化物钙钛矿单晶 （SCs） 在 X 射线检测方面显示出巨大的潜力。然而，目前钙钛矿探测器的漂移一直是商业化的主要障碍。在这里，我们使用脉冲电压 （PV） 方法研究了钙钛矿器件的电流漂移，并建立了基于 MAPbBr₃ SC 的稳定 PV 辐射探测器。电流漂移的趋势被确定为取决于等待时间，而 PV 测量中载流子的干扰可以忽略不计，这受到离子极化和缺陷增殖之间竞争效应的影响。此外，采用铝-巴托库蛋白酶 （Al-BCP） 螯合电极缩短等待时间，这对基于 PV 法的 X 射线探测器的实用性至关重要。MAPbBr₃ SC 检测器中 PV 方法和螯合界面的协同效应在 100 V 下表现出双重记录，包括 1.13 × 10⁵ μC Gy_空气^–1 cm^–2 的灵敏度和 0.7 nGy_空气 s^–1 的检测限。在连续照明下，光子产生的载流子填充了缺陷，导致明显的光电导增益产生。这项工作增强了对钙钛矿器件中电流漂移的进一步理解，并展示了钙钛矿 X 射线探测器的巨大应用潜力。