Thin Film Electrochemical Capacitors Based on Organolead Triiodide Perovskite
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AbstractOrganometal halide perovskites exhibit not only extraordinary electronic properties but also interesting ionic responses due to the ease of forming and moving native defects in the perovskite lattice. In this work such dual (electronic and ionic) conduction property is exploited to fabricate a thin film electrochemical capacitor (EC) based on organolead triiodide perovskite. The EC cells show excellent cyclability with stable capacitance output beyond 10 000 cycles. By performing electrochemical characterizations on the cells with different electrolytes and perovskite thickness, it is found that the perovskite layer serves not only as an electrode but also a solid electrolyte. Through circuit modeling of the electrochemical impedance spectra, the density of mobile ions (i.e., ionic native defects) in the perovskite films is extracted and is found to be lower than those estimated from perovskite electronic devices, e.g., solar cells. The result suggests that the ion formation and transport processes in organometal halide perovskites may largely be activated by the current of free charge carriers as well as specific interface defects.
All Author(s) ListZhou S, Li LK, Yu H, Chen JZ, Wong CP, Zhao N
Journal nameAdvanced Electronic Materials
Volume Number2
Issue Number7
LanguagesEnglish-United Kingdom
Web of Science Subject CategoriesMaterials Science; Materials Science, Multidisciplinary; Nanoscience & Nanotechnology; Physics; Physics, Applied; Science & Technology - Other Topics

Last updated on 2020-26-10 at 02:27