The stability of perovskite-based ionizing radiation detectors has garnered widespread concern. Here, the Schottky contact devices were fabricated using CsPbBr3 single crystals with either In or Bi as the anode. This research focused on analyzing the peak-centroid and energy resolution of pulse height spectra when illuminated by 241Am α particles. The cause of the operational instability in the Schottky CsPbBr3 devices at high voltage was determined to be the result of chemical and electrochemical reactions between the anode metal and perovskite. These reactions were facilitated by the ion migration within the crystals. Moreover, there was a shift in the energy level of the reacted CsPbBr3, resulting in a decrease in the charge collection efficiency. By utilizing a CsPbBr3 crystal with a high ion migration activation energy of 0.42 eV and a Bi anode that suppresses interface reactions, a peak-centroid variation of less than ±1% under a bias of ∼2667 V·cm−1 over a period of 4 months was obtained. These results are attributed to a comprehensive grasp of the high-voltage stability challenges associated with perovskite ionizing radiation detectors.

中文翻译：

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深入了解钙钛矿电离辐射探测器的高压稳定性：从界面反应到性能下降


基于钙钛矿的电离辐射探测器的稳定性引起了广泛关注。在这里，肖特基接触器件是使用 CsPbBr3 单晶制成的，其中 In 或 Bi 作为阳极。本研究的重点是分析在 241Am α 粒子照射下脉冲高度光谱的峰质心和能量分辨率。肖特基 CsPbBr3 器件在高压下运行不稳定的原因被确定为负极金属和钙钛矿之间化学和电化学反应的结果。晶体内的离子迁移促进了这些反应。此外，反应后的 CsPbBr3 的能级发生变化，导致电荷收集效率降低。通过使用具有高离子迁移活化能 0.42 eV 的 CsPbBr3 晶体和抑制界面反应的 Bi 阳极，在 ∼2667 V·cm-1 的偏压下，在 4 个月内获得了小于 ±1% 的峰质心变化。这些结果归因于对与钙钛矿电离辐射探测器相关的高压稳定性挑战的全面把握。