Self‐Driving Perovskite Dember Photodetectors

Abstract Dember effect is a potential mechanism for realizing self‐driving photodetection. Unfortunately, both the optoelectronic prediction and the experimental realization of the Dember photodetectors (DPDs) are challenging. Based on perovskite material, the theoretical prediction, numerical simulation, and experimental fabrication of the self‐driving DPDs are performed. The theoretical prediction presents a complete expression of the Dember‐voltage for the detailed physical explanation and manipulation of the Dember effect. The device‐level optoelectronic simulation is further realized to show a good agreement with the theoretical prediction, allowing to detailedly explore the excitation conditions of the Dember mechanism and obtain the optoelectronic responses of the device. The device simulation shows that the proposed DPD is sensitive to a broadband spectrum (300–750 nm), with a photo‐responsivity of 3.8 A W –1 , specific detectivity of 3.5 × 10 9 Jones, and response time of 0.13 µs at 500 nm wavelength and zero‐bias. Moreover, the photodetector is successfully fabricated and the Dember‐driving photocurrent and photoelectric response are observed, with the realized photo‐responsivity, specific detectivity, and rise (decay) time up to 0.11 A W –1 , 1.3 × 10 9 Jones, and 2.6 (3.5) µs, respectively. The study provides a promising option for the realization of high‐performance self‐driving photodetectors via Dember‐effect.