Ultrahigh-power-density flexible piezoelectric energy harvester based on freestanding ferroelectric oxide thin films.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40180966.
- Also identified by DOI 10.1038/s41467-025-58386-1 and PMC identifier 11968794.
- Licence recorded as CC BY-NC-ND.
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Abstract
Flexible piezoelectric nanogenerators are emerging as a promising solution for powering next-generation flexible electronics by converting mechanical energy into electrical energy. However, traditional ferroelectric ceramics, despite their excellent piezoelectric properties, lack flexibility; while piezoelectric polymers, although highly flexible, have low piezoelectricity. The quest to develop materials that combine high piezoelectricity with exceptional flexibility has thus become a research focus. Herein, we present a breakthrough in this field with the fabrication of freestanding (111)-oriented PbZr<sub>0.52</sub>Ti<sub>0.48</sub>O<sub>3</sub> single crystalline thin films, which exhibit remarkable flexibility and a high converse piezoelectric coefficient (~585 pm/V). This is achieved through water-soluble sacrificial layer to relieve substrate clamping and controlling the crystal orientation to further enhance the piezoelectric response. Our nanogenerators, constructed using these freestanding nanoscale membranes, demonstrate a record-high output power density (~63.5 mW/cm<sup>3</sup>), excellent flexibility (with a strain tolerance >3.4%), and superior mechanical stability in cycling tests (>60,000 cycles). These advancements pave the way for high-performance, flexible electronic devices utilizing ferroelectric oxide thin films.