Solution-processable pyrite FeS 2 nanocrystals for the fabrication of heterojunction photodiodes with visible to NIR photodetection

Di Yan Wang, You Ting Jiang, Chih Cheng Lin, Shao Sian Li, Yaw Tyng Wang, Chia Chun Chen, Chun Wei Chen

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A heterojunction photodiode with NIR photoresponse using solution processable pyrite FeS 2 nanocrystal ink is demonstrated which has the advantages of earth-abundance and non-toxicity. The device consists of a FeS 2 nanocrystal (NC) thin film sandwiched with semiconducting metal oxides with a structure of ITO/ZnO/FeS 2 NC/MoO 3/Au, which exhibits an excellent photoresponse with a spectral response extended to NIR wavelengths of up to 1150 nm and a high photocurrent/dark current ratio of up to 8000 at -1 V under AM1.5 illumination (100 mW cm -2).

Original languageEnglish
Pages (from-to)3415-3420
Number of pages6
JournalAdvanced Materials
Issue number25
Publication statusPublished - Jul 3 2012
Externally publishedYes



  • FeS nanocrystals
  • iron pyrite
  • photodetection
  • photodiodes
  • solution-processable

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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