Lead-Free Perovskite/Organic Semiconductor Vertical Heterojunction for Highly Sensitive Photodetectors

Chun Ki Liu, Qidong Tai, Naixiang Wang, Guanqi Tang, Zhao Hu, Feng Yan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

18 Citations (Scopus)


In recent years, photodetectors based on organic-inorganic lead halide perovskites have been studied extensively. However, the inclusion of lead in those materials can cause severe human health and environmental problems, which is undesirable for practical applications. Here, we report high-performance photodetectors with a tin-based perovskite/PEDOT:PSS vertical heterojunction. The device demonstrates a broadband photoresponse from NIR to UV. The maximum responsivity and gain are up to 2.6 × 106 A/W and 4.7 × 106, respectively. Moreover, a much shorter response time and higher detectivity can be achieved by reducing the thickness of PEDOT:PSS. The outstanding performance is due to the excellent optoelectronic properties of the perovskite and the photogating effect originating from the heterojunction. Furthermore, devices fabricated on flexible substrates can demonstrate not only high sensitivity but also excellent bending stability. This work opens up the opportunity of using lead-free perovskite in highly sensitive photodetectors with vertical heterojunctions.

Original languageEnglish
Pages (from-to)18769-18776
Number of pages8
JournalACS applied materials & interfaces
Issue number16
Publication statusPublished - 22 Apr 2020


  • Heterojunction
  • Lead-free perovskites
  • Organic semiconductors
  • Photodetectors
  • Photogating

ASJC Scopus subject areas

  • Materials Science(all)


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