Abstract
A fast photomultiplier photodetector with a broad/narrowband dual mode was implemented using a new 3D heterostructure based on embedded perovskite micro-sized single crystals. Because the single-crystal size is smaller than the electrode size, the active layer can be divided into the perovskite microcrystalline part for charge transport and the polymer-embedded part for charge storage. This induces an additional radical interface in the 3D heterojunction structure, and allows the photogenerated built-in electric field in radical direction, especially when the energy levels between the perovskite and embedding polymer are similar. This type of heterojunction has a small radial capacitance that can effectively reduce carrier quenching and accelerate the carrier response. By controlling the applied bias direction, up to 300-1000% external quantum efficiency (EQE) and microsecond response can be achieved not only in the wide range of ultraviolet to visible light from 320nm to 550nm, but also in the narrow-band response with a full width at half minimum (FWHM) of 20nm. This shows great potential for applications in integrated multifunctional photodetectors. This article is protected by copyright. All rights reserved.
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