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Printable organometallic perovskite enables large-area, low-dose X-ray imaging

机译：可打印的有机金属钙钛矿可实现大面积，低剂量X射线成像

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摘要

Medical X-ray imaging procedures require digital flat detectors operating at low doses to reduce radiation health risks(1,2). Solutionprocessed organic-inorganic hybrid perovskites have characteristics that make them good candidates for the photoconductive layer of such sensitive detectors(3-7). However, such detectors have not yet been built on thin-film transistor arrays because it has been difficult to prepare thick perovskite films (more than a few hundred micrometres) over large areas (a detector is typically 50 centimetres by 50 centimetres). We report here an all-solutionbased (in contrast to conventional vacuum processing) synthetic route to producing printable polycrystalline perovskites with sharply faceted large grains having morphologies and optoelectronic properties comparable to those of single crystals. High sensitivities of up to 11 microcoulombs per air KERMA of milligray per square centimetre (mu C mGyair(-1) cm(-2)) are achieved under irradiation with a 100-kilovolt bremsstrahlung source, which are at least one order of magnitude higher than the sensitivities achieved with currently used amorphous selenium or thallium-doped cesium iodide detectors. We demonstrate X-ray imaging in a conventional thin-film transistor substrate by embedding an 830-micrometrethick perovskite film and an additional two interlayers of polymer/perovskite composites to provide conformal interfaces between perovskite films and electrodes that control dark currents and temporal charge carrier transportation. Such an all-solution-based perovskite detector could enable low-dose X-ray imaging, and could also be used in photoconductive devices for radiation imaging, sensing and energy harvesting.
机译：医学X射线成像程序要求数字平板探测器在低剂量下运行以降低辐射健康风险（1,2）。固溶处理的有机-无机杂化钙钛矿具有使其成为此类灵敏探测器的光电导层的良好候选物的特性（3-7）。但是，这种检测器尚未建立在薄膜晶体管阵列上，因为很难在大面积上制备厚的钙钛矿膜（超过几百微米）（检测器通常为50厘米乘50厘米）。我们在这里报告了一种基于全溶液的合成路线（与传统的真空处理工艺相反），以生产可印刷的多晶钙钛矿，该钙钛矿的晶面和光电子特性与单晶相当，且具有锐利的大晶粒。在100千伏致辐射源的辐照下，每空气每平方厘米毫格的空气KERMA高达每平方厘米Milligray高达11微库仑（mu C mGyair（-1）cm（-2）），其灵敏度至少高一个数量级比目前使用的非晶态硒或掺th碘化铯检测器所获得的灵敏度要高。我们通过嵌入830微米厚的钙钛矿膜和另外两个聚合物/钙钛矿复合材料夹层，以提供钙钛矿膜和电极之间的保形界面，以控制暗电流和时间电荷载流子的传输，从而展示了常规薄膜晶体管基板中的X射线成像。这种基于全溶液的钙钛矿探测器可以实现低剂量X射线成像，也可以用于光导设备中以进行辐射成像，传感和能量收集。

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  • 来源
    《Nature》 |2017年第7674期|87-91|共5页
  • 作者

    Kim Yong Churl; Kim Kwang Hee; Son Dae-Yong; Jeong Dong-Nyuk; Seo Ja-Young; Choi Yeong Suk; Han In Taek; Lee Sang Yoon; Park Nam-Gyu;

  • 作者单位

    SAIT, Samsung Elect Mat Res Complex, Suwon 443803, South Korea;

    SAIT, Samsung Elect Mat Res Complex, Suwon 443803, South Korea;

    Sungkyunkwan Univ, Sch Chem Engn, Suwon 440746, South Korea|Sungkyunkwan Univ, Dept Energy Sci, Suwon 440746, South Korea;

    Sungkyunkwan Univ, Sch Chem Engn, Suwon 440746, South Korea|Sungkyunkwan Univ, Dept Energy Sci, Suwon 440746, South Korea;

    Sungkyunkwan Univ, Sch Chem Engn, Suwon 440746, South Korea|Sungkyunkwan Univ, Dept Energy Sci, Suwon 440746, South Korea;

    SAIT, Samsung Elect Mat Res Complex, Suwon 443803, South Korea;

    SAIT, Samsung Elect Mat Res Complex, Suwon 443803, South Korea;

    SAIT, Samsung Elect Mat Res Complex, Suwon 443803, South Korea;

    Sungkyunkwan Univ, Sch Chem Engn, Suwon 440746, South Korea|Sungkyunkwan Univ, Dept Energy Sci, Suwon 440746, South Korea;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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