Perovskite/poly(3-hexylthiophene)/graphene multiheterojunction phototransistors with ultrahigh gain in broadband wavelength region

Chao Xie, Feng Yan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

68 Citations (Scopus)

Abstract

Organometal halide perovskite materials have attracted much attention recently for their excellent optoelectronic properties. Here, we report an ultrasensitive phototransistor based on the multiheterojunction of CH3NH3PbI3−xClxperovskite/poly(3-hexylthiophene)/gra-phene for the first time. Since the photoexcited electrons and holes are effectively separated by the poly(3-hexylthiophene) layer, high-density electrons are trapped in the perovskite layer, leading to a strong photogating effect on the underlying graphene channel. The phototransistor demonstrates an unprecedented ultrahigh responsivity of ∼4.3 × 109A/W and a gain approaching 1010electrons per photon, respectively. More importantly, the device is sensitive in a broadband wavelength region from ultraviolet to near-infrared, which has not yet been achieved with other perovskite photodetectors. It is expected that the novel perovskite phototransistor will find promising applications as photodetection and imaging devices in the future.
Original languageEnglish
Pages (from-to)1569-1576
Number of pages8
JournalACS Applied Materials and Interfaces
Volume9
Issue number2
DOIs
Publication statusPublished - 1 Jan 2017

Keywords

  • Graphene
  • Hole transport layer
  • Perovskite
  • Phototransistor
  • Responsivity

ASJC Scopus subject areas

  • Materials Science(all)

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