Near-infrared photodetection based on PbS colloidal quantum dots/organic hole conductor

Sang Hyuk Im, Jeong Ah Chang, Sung Woo Kim, Sang Wook Kim, Sang Il Seok

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)


We have developed Near-infrared (NIR)-sensitive heterojunction cells consisting of n-type PbS colloidal quantum dots (CQDs) (low bandgap) anchored on the nanoporous TiO2 (np-TiO2, high-bandgap), and p-type spiro-OMeTAD (2,2′,7,7′-tetrakis(N,N-di-p-methoxyphenylamine)-9,9′-spirobifluorene). In these cells, an n-type np-TiO2 layer acts both as a host that chemically binds to the PbS CQDs and as an electron carrier. The number of PbS CQDs loaded onto the np-TiO2 layer not only increases the external quantum efficiency (EQE) but also reduces the response time in the NIR region. The performance of these devices increased upon the introduction of a TiOx layer between the PbS CQDs and spiro-OMeTAD followed by heat treatment at 110 °C for 1 min.

Original languageEnglish
Pages (from-to)696-699
Number of pages4
JournalOrganic Electronics
Issue number4
Publication statusPublished - 2010 Apr
Externally publishedYes


  • Near-infrared
  • Organic hole conductor
  • PbS colloidal quantum dots
  • Photodetection

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering


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