High performance of CHNHPbCl perovskite single crystal photodetector with a large active area using asymmetrical Schottky interdigital contacts.

Due to the limited electrode structure types of current CHNHPbCl perovskite single crystal photodetectors, these devices either have good performance but small active area or have large active area but poor performance, which greatly limits their applications. To realize a high performance of a CHNHPbCl perovskite single crystal photodetector with a large active area, a CHNHPbCl single crystal photodetector with asymmetrical Schottky interdigital contacts originating from planar interdigital Au-Ag electrodes was fabricated in this work. The device not only had a large active area (around 8 mm) but also showed excellent photoelectric performance due to its built-in electric field. The responsivity of the device can reach 5.8 mA W at 0 V and 0.24 A W at 30 V reverse voltage. The response time of the device can reach 317 μs (rise)/6.82 ms (decay) at 0 V and 100 μs (rise)/2 ms (decay) at 30 V reverse voltage. The above results demonstrate that this study will provide an effective method for realizing high performance of a CHNHPbCl perovskite single crystal photodetector with a large active area.