Mechanochemical Synthesis of High-Entropy Perovskite toward Highly Sensitive and Stable X-ray Flat-Panel Detectors,Advanced Materials

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Mechanochemical Synthesis of High-Entropy Perovskite toward Highly Sensitive and Stable X-ray Flat-Panel Detectors
Advanced Materials ( IF 27.4 ) Pub Date : 2023-04-06 , DOI: 10.1002/adma.202301406
Haodi Wu ₁ , Xu Chen ₁ , Zihao Song ₁ , Ao Zhang ₁ , Xinyuan Du ₁ , Xin He ₁ , Hanqi Wang ₁ , Ling Xu ₁ , Zhiping Zheng ₁ , Guangda Niu _{1,

2,

3} , Jiang Tang _{1,

2}

Affiliation

Perovskites are attracting attention for optoelectronic devices. Despite their promise, the large-scale synthesis of perovskite materials with exact stoichiometry, especially high-entropy perovskites, has been a major challenge. Moreover, the difficulty in stoichiometry control also hinders the development of perovskite X-ray flat-panel detectors. Previous reports all employed simple MAPbI₃ as the active layer, while the performance still falls short of optimized single-crystal-based single-pixel detectors. Herein, a scalable and universal strategy of a mechanochemical method is adopted to synthesize stoichiometric high-entropy perovskite powders with high quality and high quantity (>1 kg per batch). By utilizing these stoichiometric perovskites, the first FA_0.9MA_0.05Cs_0.05Pb(I_0.9Br_0.1)₃-based X-ray flat-panel detector with low trap density and large mobility–lifetime product (7.5 × 10⁻³ cm² V⁻¹) is reported. The assembled panel detector exhibits close-to-single-crystal performance (high sensitivity of 2.1 × 10⁴ µC Gy_air⁻¹ cm⁻² and ultralow detection limit of 1.25 nGy_air s⁻¹), high spatial resolution of 0.46 lp/pixel, as well as excellent thermal robustness under industrial standards. The high performance in the high-entropy perovskite-based X-ray FPDs has the potential to facilitate the development of new-generation X-ray-detection systems.

中文翻译：

高熵钙钛矿的机械化学合成用于高灵敏度和稳定的 X 射线平板探测器

钙钛矿在光电器件领域引起了人们的关注。尽管前景广阔，但具有精确化学计量的钙钛矿材料（尤其是高熵钙钛矿）的大规模合成一直是一个重大挑战。此外，化学计量控制的困难也阻碍了钙钛矿X射线平板探测器的发展。之前的报道均采用简单的 MAPbI ₃作为有源层，但性能仍低于优化的基于单晶的单像素探测器。在此，采用可扩展和通用的机械化学方法策略来合成高质量和高产量（每批> 1 kg）的化学计量高熵钙钛矿粉末。通过利用这些化学计量钙钛矿，第一个基于FA _0.9 MA _0.05 Cs _0.05 Pb(I _0.9 Br _0.1 ) ₃的X射线平板探测器具有低陷阱密度和大迁移率寿命积（7.5 × 10 -3 ^cm 2 ^V）^-1 ) 被报告。组装好的面板探测器表现出接近单晶的性能（2.1 × 10 ⁴ µC Gy _air^-1 cm ^-2的高灵敏度和1.25 nGy _air s ^-1的超低检测限）、0.46 lp/像素的高空间分辨率以及符合工业标准的出色热稳定性。基于高熵钙钛矿的 X 射线 FPD 的高性能有可能促进新一代 X 射线检测系统的开发。

更新日期：2023-04-06

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