Pulsed‐Laser Detectors Based on Metal Halide Perovskites

Abstract

AbstractConventionally, the detection of pulsed‐lasers is mainly based on thermal effects, such as thermoelectric detectors and pyroelectric detectors, which possess a photothermal conversion process, resulting in slow response and significant energy loss. Fast photodiodes are also introduced to calibrate pulsed‐lasers. However, they require advanced oscilloscopes with high bandwidth and amplification systems, limiting their practical application to some extent. To address the issues of these two types of pulsed‐laser detectors, an interfacial modification strategy is introduced to the conventional perovskite photodiodes. The incorporation of the polyvinylidene fluoride layer can effectively slow down the photovoltage decay of the perovskite devices via electric‐field induced polarization, which enables the detection of both modulated light emitting diodes and ultra‐fast pulsed‐lasers in a facile way. With such effect, the polyvinylidene fluoride (PVDF) based photodetectors can effectively convert the pulsed light input to a quasi‐DC output, which can be easily recorded with a multimeter or source meter. These devices also exhibit low noise voltage of <10−5 V Hz−1/2, high responsivity of >2 × 104 V W−1 @ 1 µW cm−2, indicating great potential for real applications.