Miniaturized Self‐Powered Perovskite Spectrometer

ABSTRACT Miniaturized reconstructive spectrometers with small footprint, light weight, and low cost have attracted much attention due to their ability to capture spectral information in scientific research and industrial inspection. However, the current state‐of‐the‐art designs face challenges in the ultralow power consumption and high spectral resolution. For example, it is difficult to maintain high spectral resolution while reducing the number of integrated spectral response units. In this work, we construct a miniaturized self‐powered polycrystalline perovskite spectral sensing system based on bandgap‐tunable perovskite. A representative device exhibits a peak external quantum efficiency (EQE) of 75%, reflecting the high photoelectric conversion capability of the material system. We achieve high spectral resolution comprising only 8 photodetectors by utilizing reconstruction algorithms and dimensionality reduction methodologies. Furthermore, we demonstrate narrow‐band spectral sensing in the 680–800 nm wavelength range with spectral resolutions of ∼5 nm and average peak accuracies of ∼0.85 nm under the light intensity below 10 µW cm ⁻² . The photodetectors operate without an external bias, while only the necessary power consumption for readout circuit and algorithm reconstruction. This work greatly paves the way for the development of low‐power and high‐resolution miniaturized spectrometers and advances the practical application of spectrometers in hyperspectral imaging.