Using tert-butanol, thin films with a very large grain size of up to several micrometers and with preferred crystallite orientation were fabricated. Thin film morphology, such as grain and crystallite size, depended on the solvent. An excessive amount of PbI2 found in perovskite films prepared with n-butanol indicates incomplete conversion. XRD patterns, absorption and PL spectra proved α-phase formation for all selected solvents. They were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) and their photophysical properties were studied by means of absorption and photoluminescence (PL) spectroscopies. Thin films made of formamidinium lead iodide (FAPbI3) perovskites prepared by a two-step sequential deposition method using various solvents for formamidinium iodide (FAI) - isopropanol, n-butanol and tert-butanol, were studied with the aim of finding a correlation between morphology and solvent properties to improve film quality. This work proves that lead- and halide-free hybrid piezoelectrics can serve as eco-friendly materials for flexible sensing and energy harvesting. Furthermore, the devices also show good sensitivity in monitoring human body motions, including finger tapping, wrist and elbow bending, and foot stepping. Meanwhile, a typical device was demonstrated to exhibit excellent mechanical durability under 5500 cycles and environmentally stable over 60 days. Experimental results demonstrate that the 15 wt% 3Mn-(SCN)5/PBAT devices present an exceptional performance in energy harvesting, which can produce a maximum output voltage of 18.49 V and a power density of 7.88 µW cm−2 under an applied force of only 0.03 MPa, catching up with those of the state-of-the-art piezoelectric energy harvesting devices.
Will state of decay 3 be on pc series#
More importantly, the mechanical energy harvesting properties of its flexible composite films, 3Mn(SCN)5/PBAT (PBAT, polybutylene adipate terephthalate), with a series of weight ratios (1, 5, 10, 15, and 20 wt%) of 3Mn(SCN)5 are reported. Here, a new stable zero-dimensional hybrid piezoelectric, 3Mn(SCN)5 (Me-V, 1-methyl-bipyridinium), based on a pseudo-halogen environmentally friendly anion of SCN− was synthesized.
In this context, eco-friendly and stable hybrid materials with excellent piezoelectric properties are highly sought after. However, the reported systems usually contain toxic heavy metals or are unstable due to sensitive metal halide bonds in air. Hybrid organic-inorganic piezoelectrics have received considerable attention in recent years owing to their fascinating performance, facile synthesis, and mechanical flexibility. (i) Energy level illustration of the HP-TENG under friction-illumination working conditions. (h) Device structure of CsPbBr 3 /PC TENG. (g) The working mechanism of the HP-TENG device under the illumination. (f) Device structure of PTFE -pentacene/perovskite/TiO 2 TENG and the corresponding cross-sectional SEM image. Copyright 2016, Royal Society of Chemistry.
(e) Device structure of MAPbI 3 -based TENG under the illumination state and the surface potential of the MAPbI 3 perovskite at four different states (the initial state under dark conditions, the state after 5 minute-rubbing under dark conditions, the state after rubbing under the illumination state, and the stable state after the charge decay process). (d) Device structure of rhombus Co(OH)(CO 3 ) 0.5 /Pt/CsPbIBr 2 -based TENG and the corresponding crystal structure of CsPbIBr 2.
Copyright 2020, Royal Society of Chemistry. (c) Schematic illustration of the nanocapacitor structures in the Pt/CsPbBr 3 film. (b) The working mechanism of triboelectric enhancement in the metal/perovskite Schottky junction. (a) Device structure of CsPbBr 3 -Au compositebased TENG. Charge trapping optimization and photoinduced electrical enhancement of different HP-TENGs.
0 kommentar(er)
