Flexible Ultrathin Single-Crystalline Perovskite Photodetector
Flexible Ultrathin Single-Crystalline Perovskite Photodetector
复制标题
柔性超薄单晶钙钛矿光电探测器
DOI：
10.1021/acs.nanolett.0c02468
复制
发表时间：
2020-10-14
期刊：
影响因子：
10.8
通讯作者：
Wang, Mu
中科院分区：
文献类型：
--
作者：
Jing, Hao;Peng, Ruwen;Wang, Mu
柔性光电器件因其在仿生学、机器人、医疗保健等领域创造新型可穿戴设备方面的突出作用而受到广泛关注。尽管块状单晶钙钛矿基材料比多晶钙钛矿基材料具有更高的光电转换效率，但不幸的是，它们的刚性和脆性阻碍了它们在柔性器件中的应用。在这里，我们引入超薄单晶钙钛矿薄膜作为有源层，并展示了具有普遍弯曲可靠性的高性能柔性光电探测器。利用该超薄薄膜制成的光电探测器的厚度仅为20 nm，其响应率显著提高至5600A/W，比最近报道的柔性钙钛矿光电探测器的响应率提高了2个数量级。所演示的0.2 MHz 3db带宽进一步为高速光探测铺平了道路。值得注意的是，在弯曲数千次后，其所有光电特性都恢复了。这些结果显示了单晶钙钛矿超薄膜在开发可穿戴和柔性光电器件方面的巨大潜力。
Flexible optoelectronic devices attract considerable attention due to their prominent role in creating novel wearable apparatus for bionics, robotics, health care, and so forth. Although bulk single-crystalline perovskite-based materials are well-recognized for the high photoelectric conversion efficiency than the polycrystalline ones, their stiff and brittle nature unfortunately prohibits their application for flexible devices. Here, we introduce ultrathin single-crystalline perovskite film as the active layer and demonstrate a high-performance flexible photodetector with prevailing bending reliability. With a muchreduced thickness of 20 nm, the photodetector made of this ultrathin film can achieve a significantly increased responsivity as 5600A/W, 2 orders of magnitude higher than that of recently reported flexible perovskite photodetectors. The demonstrated 0.2 MHz 3 dB bandwidth further paves the way for high-speed photodetection. Notably, all its optoelectronic characteristics resume after being bent over thousands of times. These results manifest the great potential of single-crystalline perovskite ultrathin films for developing wearable and flexible optoelectronic devices.