Ultrahigh‐Performance Flexible and Self‐Powered Photodetectors with Ferroelectric P(VDF‐TrFE)/Perovskite Bulk Heterojunction

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  • Fengren Cao
    School of Physical Science and Technology Center for Energy Conversion Materials and Physics (CECMP) Jiangsu Key Laboratory of Thin Films Soochow University Suzhou 215006 P. R. China
  • Wei Tian
    School of Physical Science and Technology Center for Energy Conversion Materials and Physics (CECMP) Jiangsu Key Laboratory of Thin Films Soochow University Suzhou 215006 P. R. China
  • Linxing Meng
    School of Physical Science and Technology Center for Energy Conversion Materials and Physics (CECMP) Jiangsu Key Laboratory of Thin Films Soochow University Suzhou 215006 P. R. China
  • Meng Wang
    School of Physical Science and Technology Center for Energy Conversion Materials and Physics (CECMP) Jiangsu Key Laboratory of Thin Films Soochow University Suzhou 215006 P. R. China
  • Liang Li
    School of Physical Science and Technology Center for Energy Conversion Materials and Physics (CECMP) Jiangsu Key Laboratory of Thin Films Soochow University Suzhou 215006 P. R. China

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<jats:title>Abstract</jats:title><jats:p>Flexible and self‐powered perovskite photodetectors attract widespread research interests due to their potential applications in portable and wearable optoelectronic devices. However, the reported devices mainly adopt an independent layered structure with complex fabrication processes and high carrier recombination. Herein, an integrated ferroelectric poly(vinylidene‐fluoride‐trifluoroethylene) (P(VDF‐TrFE)) and perovskite bulk heterojunction film photodetector on the polyethylene naphthalate substrate is demonstrated. Under the optimum treatment conditions (the polarization voltage and time, and the concentration of P(VDF‐TrFE)), the photodetector exhibits a largely enhanced performance compared to the pristine perovskite device. The resulting device exhibits ultrahigh performance with a large detectivity (1.4 × 10<jats:sup>13</jats:sup> Jones) and fast response time (92/193 µs) at the wavelength of 650 nm. The improved performance is attributed to the fact that the polarized P(VDF‐TrFE)/perovskite hybrid film provides a stronger built‐in electric field to facilitate the separation and transportation of photogenerated carriers. These findings provide a new route to design self‐powered photodetectors from the aspect of device structure and carrier transport.</jats:p>

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