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Hydrogel nanophotonic devices exhibit attractive tunable capabilities in structural coloration and optical display. However, current hydrogel‐based tunable strategies are mostly based on a single physical mechanism, and it remains a challenge to merge multiple mechanisms for active devices with integrated functionalities. Here, a hydrogel metagrating combining Fabry‐Pérot (FP) resonance and diffraction effects is proposed for achieving tunable absorption and dynamic wavelength‐selective beam steering. Through exploiting hydrogel shrinkage under electron‐beam exposure, a hydrogel nanocavity composed of Ag/Hydrogel/Ag three‐layer films can be directly printed with arbitrary patterns, enabling the direct‐pattering technique of metagrating. The hydrogel nanocavity performs as an FP‐type absorber, and its absorption peak rapidly shifts with humidity variation due to the hydrogel layer scaling. The response speed is <320 ms, and the absorption peak shift range is >150 nm. It is further demonstrated that the hydrogel metagrating exclusively deflects light at the resonance wavelength, and its operating wavelength can be actively switched by regulating ambient humidity. The proposed tunable hydrogel metagrating can promote new technologies of tunable metasurfaces for optical filtering, gas sensing, and optical imaging. [ABSTRACT FROM AUTHOR]

For low temperature (≤180 °C) processed perovskite solar cells (PSCs), SnO2 has been proven to be one of the most effective electron transporting layer. However, problems, such as poor electric conductivity and high defect density, inevitably exist in the SnO2 films which are fabricated using low temperature solution methods. Element doping of SnO2 film is a feasible strategy to alleviate the above problems. Herein, W doping of the SnO2 is realized through addition of ammonium tungstate hydrate into the molecular precursor of SnO2. The W doped SnO2 film exhibits higher conductivity, and can better extract and transport the electrons from the perovskite films. Hence, power conversion efficiency is boosted from 20.60 % for the reference PSCs to 21.83 % for PSCs fabricated on 2.5 mg mL−1 ammonium tungstate hydrate doped SnO2 films. [ABSTRACT FROM AUTHOR]