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首页> 外文期刊>Advanced Functional Materials >High-Quality Cuboid CH_3NH_3PbI_3 Single Crystals for High Performance X-Ray and Photon Detectors
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High-Quality Cuboid CH_3NH_3PbI_3 Single Crystals for High Performance X-Ray and Photon Detectors

机译：用于高性能X射线和光子检测器的高质量长方体CH_3NH_3PbI_3单晶

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摘要

Organic-inorganic halide hybrid perovskite materials are promising materials for X-ray and photon detection due to their superior optoelectronic properties. Single-crystal (SGC) perovskites have increasingly attracted attention due to their substantially low crystal defects, which contribute to improving the figures of merit of the devices. Cuboid CH3NH3PbI3 SGC with the naturally favorable geometry for device fabrication is rarely reported in X-ray and photon detection application. The concept of seed dissolution-regrowth to improve crystal quality of cuboid CH3NH3PbI3 SGC is proposed and a fundamental understanding of the nucleation and growth is provided thermodynamically. The X-ray detector fabricated from cuboid CH3NH3PbI3 SGC demonstrates the firstly reported high sensitivity of 968.9 mu C-1 Gy(-1) cm(-2) under -1 V bias. The results also show that the favorable crystal orientation and high quality of cuboid CH3NH3PbI3 leads to better responsivity and faster response speed than the more common dodecahedral CH3NH3PbI3 in photodetection. Consequently, the work paves a way to synthesize high-quality perovskite SGCs and benefits the application of MAPbI(3) SGCs with preferred crystal orientation and favorable crystal geometry for emerging device applications.
机译：有机-无机卤化物杂化钙钛矿材料因其优异的光电性能而成为用于X射线和光子检测的有前途的材料。单晶（SGC）钙钛矿由于其晶体缺陷低而引起了越来越多的关注，这有助于改善器件的品质因数。在X射线和光子检测应用中，很少报道具有对于器件制造具有自然有利的几何形状的长方体CH3NH3PbI3 SGC。提出了用于提高长方体CH3NH3PbI3 SGC晶体质量的种子溶解-再生长的概念，并从热力学角度提供了对成核和生长的基本理解。由长方体CH3NH3PbI3 SGC制成的X射线探测器展示了第一个报道的在-1 V偏压下968.9 mu C-1 Gy（-1）cm（-2）的高灵敏度。结果还表明，与光检测中最常见的十二面体CH3NH3PbI3相比，长方体CH3NH3PbI3的良好晶体取向和高质量可导致更好的响应度和更快的响应速度。因此，这项工作为合成高质量钙钛矿型SGC铺平了道路，并为新兴器件应用提供了具有最佳晶体取向和良好晶体几何形状的MAPbI（3）SGC。

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  • 来源
    《Advanced Functional Materials》 |2019年第6期|1806984.1-1806984.7|共7页
  • 作者

    Ye Fei; Lin Hong; Wu Haodi; Zhu Lu; Huang Zhanfeng; Ouyang Dan; Niu Guangda; Choy Wallace C. H.;

  • 作者单位

    Univ Hong Kong, Dept Elect & Elect Engn, Pokfulam Rd, Hong Kong 852, Peoples R China;

    Univ Hong Kong, Dept Elect & Elect Engn, Pokfulam Rd, Hong Kong 852, Peoples R China;

    Huazhong Univ Sci & Technol Wuhan, Wuhan Natl Lab, Wuhan, Hubei, Peoples R China;

    Univ Hong Kong, Dept Elect & Elect Engn, Pokfulam Rd, Hong Kong 852, Peoples R China;

    Univ Hong Kong, Dept Elect & Elect Engn, Pokfulam Rd, Hong Kong 852, Peoples R China;

    Univ Hong Kong, Dept Elect & Elect Engn, Pokfulam Rd, Hong Kong 852, Peoples R China;

    Huazhong Univ Sci & Technol Wuhan, Wuhan Natl Lab, Wuhan, Hubei, Peoples R China;

    Univ Hong Kong, Dept Elect & Elect Engn, Pokfulam Rd, Hong Kong 852, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    cuboid; perovskite; photodetector; single crystal; X-ray detector;

    机译：长方体;钙钛矿;光电探测器;单晶;X射线探测器;

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