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<p>By converting light into mechanical strain, photostrictive materials are expected to define a revolutionary solution to the wireless micro-electromechanical devices. However, the photoinduced strain (photostriction) of most inorganic materials are unsatisfactory as compared to the electric-field-induced strain of ferro/piezoelectric materials. Here, we demonstrate the effective optimization of the photostriction of inorganic materials by constructing polymorphic phase boundary (PPB) in Pb<sub>3</sub>V<sub>2-<i>x</i></sub>P<sub><i>x</i></sub>O<sub>8</sub> compounds. Large photostriction over 0.3% and excellent photostrictive efficiency in the level of 10<sup>-10</sup> m<sup>3</sup>/W are realized in Pb<sub>3</sub>V<sub>2-<i>x</i></sub>P<sub><i>x</i></sub>O<sub>8</sub> compositions at the PPB region, which perform better than most of the existing inorganic photostrictive materials. Besides, photostriction over 0.1% (same level of piezoelectric strain) can be achieved with light intensity as low as 200 mW/cm<sup>2</sup>. We theoretically reveal that enhanced photostriction arises from photoinduced phase transition driven by Pb-O-V collinearity and V-V dimer formation, and P-doping can facilitate the transition, enabling large deformation at low photoexcitation. This work will accelerate the development of high-performance inorganic photostrictive materials and their applications for optomechanical devices.</p>

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Constructing polymorphic phase boundary for high-performance inorganic photostrictive materials

  • 期刊论文

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  • 发表日期：

    2025年3月21日

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  • Chen Chen,
  • Wenhao Liu,
  • Fengwu Guo,
  • Xiang He,
  • Lu Wang,
  • Muzaffar Ahmad Boda,
  • Xiao Wang,
  • Junwei Luo,
  • Zhiguo Yi

摘要

By converting light into mechanical strain, photostrictive materials are expected to define a revolutionary solution to the wireless micro-electromechanical devices. However, the photoinduced strain (photostriction) of most inorganic materials are unsatisfactory as compared to the electric-field-induced strain of ferro/piezoelectric materials. Here, we demonstrate the effective optimization of the photostriction of inorganic materials by constructing polymorphic phase boundary (PPB) in Pb3V2-xPxO8 compounds. Large photostriction over 0.3% and excellent photostrictive efficiency in the level of 10-10 m3/W are realized in Pb3V2-xPxO8 compositions at the PPB region, which perform better than most of the existing inorganic photostrictive materials. Besides, photostriction over 0.1% (same level of piezoelectric strain) can be achieved with light intensity as low as 200 mW/cm2. We theoretically reveal that enhanced photostriction arises from photoinduced phase transition driven by Pb-O-V collinearity and V-V dimer formation, and P-doping can facilitate the transition, enabling large deformation at low photoexcitation. This work will accelerate the development of high-performance inorganic photostrictive materials and their applications for optomechanical devices.