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In this study, we present a piezoelectret film of polyvinylidene fluoride-\n                    <jats:italic toggle=\"yes\">co<\/jats:italic>\n                    -trifluoroethylene featuring cross-scale pores, sandwiched between two fluorinated ethylene propylene layers. The patterned pores enable the storage of substantial net charges, resulting in a dense network of oriented space charges. Under mechanical loadings, these charges undergo notably relative displacements and induce variations in local electric field, with an effective piezoelectric coefficient of up to 2.1\u00a0\u00d7\u00a010\n                    <jats:sup>4<\/jats:sup>\n                    picocoulombs per newton. This sandwich-structured film allows for real-time monitoring of biosignals for minimal mechanical inputs. For example, a light finger touch generates charge pulses exceeding 100 V, whereas wrist pulses yield high-fidelity, high-voltage signals. This work advances the field of flexible, self-powered electronics by providing a high-performance piezoelectric material, setting a benchmark for sensitivity and scalability in biosignal detection.\n                  <\/jats:p>","DOI":"10.1126\/sciadv.adt4003","type":"journal-article","created":{"date-parts":[[2025,5,7]],"date-time":"2025-05-07T13:58:56Z","timestamp":1746626336000},"update-policy":"https:\/\/doi.org\/10.34133\/aaas_crossmark","source":"Crossref","is-referenced-by-count":18,"title":["Ultrasensitive piezoelectric-like film with designed cross-scale pores"],"prefix":"10.1126","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0009-0005-2482-6178","authenticated-orcid":true,"given":"Yifan","family":"Li","sequence":"first","affiliation":[{"name":"State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace Engineering, Xi\u2019an Jiaotong University, Xi\u2019an 710049, 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