High-performance photodetectors based on an interface modified hybrid perovskite film are reported. Large crystalline grains are formed in perovskite layer with less PbI₂. The on/off switching ratio higher than 10⁵ is achieved. Owing to the enhanced efficiency in carrier transport and extraction, the photodetector with a modified interface shows a transient response time as fast as 110 ns. In addition, such devices show an X-ray sensitivity up to $67\mu \text{C}$ Gy⁻¹ cm⁻². Our work indicates that the use of hybrid perovskite film with interface engineering is a promising method for efficient photon detection in visible light and X rays mainly because of their fast carrier extraction, low cost and easy preparation.

中文翻译：

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基于界面改性钙钛矿薄膜的具有 X 射线响应度的高性能光电探测器

报道了基于界面改性混合钙钛矿薄膜的高性能光电探测器。PbI ₂较少的钙钛矿层中形成大晶粒。实现了高于10 ⁵的开/关切换比。由于载流子传输和提取效率的提高，具有改进界面的光电探测器显示出高达 110 ns 的瞬态响应时间。此外，此类设备的 X 射线灵敏度高达 $67\mu\text{C}$ Gy ^-1 cm ^-2。我们的工作表明，使用具有界面工程的混合钙钛矿薄膜是一种在可见光和 X 射线中进行有效光子检测的有前途的方法，主要是因为它们的载流子提取速度快、成本低且易于制备。