Solution‐processed lead halide perovskites are considered one of the promising materials for flexible optoelectronics. However, the array integration of ultrathin flexible perovskite photodetectors (PDs) remains a significant challenge limited by the incompatibility of perovskite materials with manufacturing techniques involving polar liquids. Here, an ultrathin (2.4 µm) and conformable perovskite‐based PD array (10 × 10 pixels) with ultralight weight (3.12 g m−2) and excellent flexibility, is reported. Patterned all‐inorganic CsPbBr3 perovskite films with precise pixel position, controllable morphology, and homogenous dimension, are synthesized by a vacuum‐assisted drop‐casting patterning process as the active layer. The use of waterproof parylene‐C film as substrate and encapsulation layer effectively protects the perovskite films against penetration of polar liquids during the peeling‐off process. Benefitting from the encapsulation and ultrathin property, the device exhibits long‐term stability in the ambient environment, and robust mechanical stability under bending or 50% compressive strain. More importantly, the ultrathin flexible PD arrays conforming to hemispherical support realize imaging of light distribution, indicating the potential applications in retina‐like vision sensing.
The
application of supercapacitors for long-term energy storage
is largely limited by their self-discharge behavior. Finding an effective
approach to suppress self-discharge remains a great research challenge.
Herein, a porous poly(vinylidene fluoride) (PVDF) membrane with a
piezoelectric effect is employed as supercapacitor separators for
reduced self-discharge. The PVDF membrane is prepared via a phase-inversion
method followed by polarization to induce piezoelectricity. Self-discharge
tests indicate that both open-circuit voltage (OCV) decay rate and
leakage current of the supercapacitors with piezoelectric PVDF separators
are reduced by more than 30% compared to those with nonpiezoelectric
separators. The much lower self-discharge rate can be attributed to
the impeded diffusion of electrolyte ions across the polarized PVDF
separators.
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