Making perovskite metasurface for broadband photodetection

We demonstrate that introducing a metasurface made of hybrid organic-inorganic perovskite can significantly enhance broadband absorption and improve photonto-electron conversion, which roots from exciting Mie resonances together with suppressing optical transmission. Based of the hybrid organic-inorganic perovskite metasurface, a broadband photodetector has been fabricated where photocurrent boosts more than 10 times from ultraviolet to visible range. The device response time is less than 5.1 μs at wavelengths 380, 532, and 710 nm, and the relevant 3 dB bandwidth is over 0.26 MHz. Moreover, this photodetector has been applied as a signal receiver for transmitting two-dimensional color images in broadband optical communication.