Gradient 2D/3D Perovskite Films Prepared by Hot-Casting for Sensitive Photodetectors

Hok Leung Loi, Jiupeng Cao, Xuyun Guo, Chun Ki Liu, Naixiang Wang, Jiajun Song, Guanqi Tang, Ye Zhu, Feng Yan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

8 Citations (Scopus)


2D Ruddlesden–Popper perovskites have attracted wide attention recently because of tunable optoelectronic properties and have been used as alternatives to their 3D counterparts in various optoelectronic devices. Here, a series of (PEA)2(MA)n −1PbnI3 n +1 perovskite thin films is designed and fabricated by a convenient hot-casting method to obtain gradient n in the films, which leads to the formation of vertical heterojunctions that can enhance charge separation in the films under light illumination. Based on a single gradient perovskite film, a highly sensitive and stable photodetector with a responsivity up to 149 AW−1 and a specific detectivity of 2 × 1012 Jones is obtained. This work paves a way to realizing high-performance optoelectronic devices with enhanced charge separation by introducing compositional gradient in a perovskite film.

Original languageEnglish
Article number2000776
JournalAdvanced Science
Issue number14
Publication statusPublished - 1 Jul 2020


  • 2D perovskites
  • hot-casting
  • perovskites
  • photodetectors
  • vertical heterojunctions

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Chemical Engineering(all)
  • Biochemistry, Genetics and Molecular Biology (miscellaneous)
  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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