In general, self-powered photodetectors are tedious and costly. Here, high-performance self-powered visible photodetectors based on MAPbI ₃ films were fabricated by using asymmetric Au electrodes. For this construction of photodetector, the illumination passing through the translucent MAPbI ₃ film can reduce the Schottky barrier between the lower electrode and perovskite, and the Au particles doping into the MAPbI ₃ at the contact areas between the upper electrode and films can also change the Schottky barrier, which leads to the formation of built-in potential. Without an applied bias, the photodetectors exhibit an ultralow dark current of $\sim 3$ pA. At the power intensity of 2.92 mW/cm ² under 635 nm illumination, a decent responsivity of 10 mAW ⁻¹ , a high specific detectivity of $3.3 \times 10^{11}$ cmHz ¹ /2W ⁻¹ , and an external quantum efficiency of 2.1% are obtained. The on/off ratio reaches 10 ⁴ and the response speed is less than 50 ms. Our results pave a new design concept to form a self-powered perovskite-based photodetector.

中文翻译：

---

非对称金电极诱导的自供电有机-无机钙钛矿光电探测器

通常，自供电的光电探测器既乏味又昂贵。在这里，通过使用不对称金电极制造了基于MAPbI ₃膜的高性能自供电可见光探测器 。对于这种光电探测器的结构，穿过半透明MAPbI ₃膜的照明 可以减小下电极和钙钛矿之间的肖特基势垒，并且在上电极和膜之间的接触区域掺杂到MAPbI ₃中的Au颗粒 也可以改变肖特基势垒，导致形成内在的潜力。在没有施加偏压的情况下，光电探测器的超低暗电流为 $ \ sim 3 $ pA。在635 nm照明下的功率强度为2.92 mW / cm ^2时，良好的响应度为10 mAW ^-1 ，高比检测度为 $ 3.3 \乘以10 ^ {11} $ 获得cmHz ¹ / 2W ^-1 ，并且外部量子效率为2.1％。开/关比达到10 ⁴且响应速度小于50毫秒。我们的研究结果为形成基于钙钛矿的自供电光电探测器提供了新的设计理念。