Origin of the Substrate-Dependent Stability of a High-Performance Perovskite Supercapacitor for Flexible Electronics

Abstract

Thin-film-based energy storage devices, especially supercapacitors, are in high demand due to their high power density and ease of integration with portable electronic devices. However, their stability as well as performance is limited due to their substrate properties. Here we have fabricated halide perovskite-based flexible asymmetric supercapacitors by introducing quasi-solid-state gel electrolytes between two electrodes. We have studied the performance and stability of the supercapacitor fabricated on 50-and 200-μm-thick stainless-steel (SS) and 100-μmthick flexible graphite substrates. A device fabricated on a thin SS substrate follows exponential decay-type behavior, while it is asymptotic for a flexible graphite substrate at a higher bending angle. Both devices are stable for a small twisting angle; however, the device performance decreases sharply for the SS substrate after 60°twisting angle due to fast delamination and crack formation. Bending and twisting cycle measurement of the supercapacitor on a flexible graphite substrate shows better cyclic stability over 50-μm-thick SS substrates due to dissipation of microstrain. To improve the operating voltage of the storage devices, stacked supercapacitors are designed with two or more subcells that can drive white light-emitting diodes (>3.0 V).

Discerning the Role of A‐Site Cation on the Efficiency and Stability of the Halide Perovskite Solid‐State Supercapacitor

“…Here, we have used S.S. substrate of thickness 0.05 μm for the fabrication of flexible device. [15] A custombuilt programmable linear and an angular stage with a device/ substrate holder were used to test the device's flexibility and its stability as shown in Figure 7 and S8, Supporting Information. The instruments are programmed for bending and twisting-angle-dependent device performance as well as bending and twisting cycle stability tests.…”

“…[8][9][10] Halide perovskite materials have emerged as a potential candidate for supercapacitor applications due to their high surface area and good ionic mobility, but the use of these materials has been limited so far. [11][12][13][14][15] Zhou et al were the first to investigate the ionic conduction of methyl ammonium lead iodide (MAPbI 3 ) in a symmetric electrochemical capacitor. [16] Due to their large surface area and excellent ionic mobility, halide perovskite electrodes are well-suited for supercapacitors.…”

Air-Processed All-Inorganic Halide Perovskites Integrated Photorechargeable Supercapacitors

“…High light absorption coefficient, low carrier recombination rate, and micron-scale carrier diffusion length are some of the unique benefits of halide perovskite that enable high PCE in perovskite solar cells. − Recently, perovskite-based solid-state supercapacitors have been reported to have excellent stability and efficiency. − Therefore, it is possible to integrate a perovskite solar cell and a perovskite supercapacitor into a monolithic structure, enhancing the performance of the integrated device at a reduced cost. Several high-performance supercapacitor materials reported in the literature could be potential candidates for integrated photo rechargeable supercapacitors.…”