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

57 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)
  • General Chemical Engineering
  • Biochemistry, Genetics and Molecular Biology (miscellaneous)
  • General Materials Science
  • General Engineering
  • General Physics and Astronomy


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