Journal
NANO ENERGY
Volume 92, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2021.106785
Keywords
Perovskite halide; CsSnI3; Piezoelectric energy harvesting; Multilayer; Thin film
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Funding
- National Research Foundation of Korea [NRF-2021R1A2C2013501, NRF-2020M3D1A2102913]
- Creative Materials Discovery Program of the Ministry of Science and ICT [2018M3D1A1058536]
- Graduate School of 2020 Yonsei University Research Scholarship Grants
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This study presents the first Pb-free inorganic halide-based thin film harvester with enhanced energy generation capabilities by incorporating a metallic interlayer structure. High-quality CsSnI3 thin films prepared using a one-step spin coating method were stacked up to four layers with alternating Cu interlayers, demonstrating impressive piezoelectric energy harvesting characteristics.
Although asymmetric perovskite halides are known to possess viable piezoelectricity, their performance of energy harvesting has been limitedly reported. Herein, we propose the first Pb-free inorganic halide-based thin film harvester having strong capability of power-generation, particularly with additional efforts to enhance the device performance using an unprecedented multilayer structure incorporated with metallic interlayers. Representative high-quality CsSnI3 thin films were prepared by one-step spin coating, and up to four layers were stacked with alternating Cu interlayers. Impressive piezoelectric energy harvesting characteristics of -22.9 V and -1233 nA were attained for the four-layered halide structure after poling, which are highest values recorded thus far for perovskite halide thin films. The origin of the enhanced energy-generation is believed to be directly associated with the increased SnI6-octahedra distortion (with off-centering of Sn atoms) by poling and the extra spacecharge polarization by Cu interlayers.
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