Metal halide perovskite single crystals (SCs) emerge as a promising candidate for ionizing radiation detection. The realization of top-performing radiation detectors typically relies on careful crystal selection from broad candidate groups, as residual strain remains unavoidable during the SC growth process, which often leads to the formation of ferroelastic domains with varied orientations. Here, we introduce an in-line tempering strategy to alleviate microstrain and homogenize the domain orientation across methylammonium lead iodide (MAPbI 3 ) perovskite SCs. The progressive strain relief during the phase transition in situ, demonstrated by the removal of ferroelastic domain walls, substantially enhances the crystallinity and the optoelectronic properties of the MAPbI 3 SCs. As a result, the gamma-ray energy spectrum detector leveraging these strain-relaxed SCs achieves an energy resolution of 7.2% at 59.5 keV for a 241 Am gamma-ray source, and the 25-pixel device performs highly uniformly with concentrated current distribution, which paves the way for its implementation in high-resolution radiation spectroscopy.

中文翻译：

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在线回火消除了钙钛矿单晶中的畴边界，用于高能量分辨率电离辐射探测器


金属卤化物钙钛矿单晶 （SCs） 成为电离辐射检测的有前途的候选者。实现最佳性能的辐射探测器通常依赖于从广泛的候选组中仔细选择晶体，因为在 SC 生长过程中残余应变仍然不可避免，这通常会导致形成具有不同取向的铁弹性畴。在这里，我们介绍了一种在线回火策略，以减轻微应变并均质化甲基铵碘化铅 （MAPbI 3） 钙钛矿 SC 的域取向。原位相变过程中的渐进式应力消除，通过去除铁弹性畴壁证明，大大提高了 MAPbI 3 SCs 的结晶度和光电性能。因此，利用这些应变松弛 SC 的伽马射线能谱探测器在 59.5 keV 下为 241 Am 伽马射线源实现了 7.2% 的能量分辨率，并且 25 像素器件在集中电流分布下表现高度均匀，这为其在高分辨率辐射光谱学中的实现铺平了道路。