Millimeter-sized PbI2 flakes and Pb5S2I6 nanowires for flexible photodetectors†,Journal of Materials Chemistry C

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Millimeter-sized PbI2 flakes and Pb5S2I6 nanowires for flexible photodetectors†
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2018-05-14 00:00:00 , DOI: 10.1039/c8tc01657g
Lin Sun _{1,

2,

3,

4} , Chunrui Wang _{1,

2,

3,

4} , Liu Xu _{1,

2,

3,

4} , Jiale Wang _{1,

2,

3,

4} , Xiaoshuang Chen _{1,

2,

3,

4,

5} , Gyu-Chul Yi _{6,

7,

8,

9}

Affiliation

Large-area and high-quality 2D layered materials with good electrical performance are necessary although active 2D materials for devices are usually limited to micrometer-sizes. Herein, large-size layered-crystalline lead(II) iodide (PbI₂) flakes with sizes of up to 5 mm were synthesized via a hydrothermal method. Thiourea facilitated their large-area growth. Photocurrent measurements of a PbI₂ flake photodetector (PD) constructed on flexible polyimide (PI) substrates exhibit a responsivity at 510 nm of up to 5 mA W⁻¹. Additionally, the fast response speed of the device is less than 30 ms. Low dark currents are lower than 10 pA at a bias of 5 V. The spectral selectivity of our PbI₂ flakes may potentially be used for narrowband photodetection. The process can also be converted to produce Pb₅S₂I₆ nanowires (NWs) with a broadened spectral response range by changing the ratio of reactants. Our results on the freestanding growth of large area PbI₂ flakes and Pb₅S₂I₆ NWs may lead to facile flexible device fabrication possibilities. These findings will broaden our fundamental knowledge of van der Waals layered halide semiconductors. Meanwhile, such a hydrothermal synthetic approach paves a practical route towards large-area promising organic–inorganic perovskite, which is hosted by PbI₂.

中文翻译：

毫米大小的PbI ₂薄片和Pb ₅ S ₂ I ₆纳米线，用于柔性光电探测器†

尽管设备的有源2D材料通常限于微米大小，但具有良好电性能的大面积高质量2D分层材料是必需的。这里，大尺寸层状结晶铅（II），碘化（PBI ₂）高至5毫米的尺寸，合成薄片通过水热法。硫脲促进了它们的大面积生长。在柔性聚酰亚胺（PI）基板上构建的PbI ₂片状光电探测器（PD）的光电流测量结果显示，在510 nm下的响应度高达5 mA W ^-1。此外，设备的快速响应速度小于30毫秒。低暗电流在5 V偏压下低于10 pA。我们的PbI ₂的光谱选择性薄片可能会用于窄带光电检测。通过改变反应物的比例，该过程也可以转换为生产具有更宽光谱响应范围的Pb ₅ S ₂ I ₆纳米线（NWs）。我们对大面积PbI ₂薄片和Pb ₅ S ₂ I ₆ NW的独立生长的研究结果可能会带来灵活的柔性器件制造可能性。这些发现将拓宽我们对范德华层状卤化物半导体的基础知识。同时，这种水热合成方法为大面积的有前途的有机-无机钙钛矿铺平了一条切实可行的途径，该方法由PbI ₂承载。

更新日期：2018-05-14

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