Infrared photodiode based on colloidal PbSe nanocrystal quantum dots

Dehu Cui, Jian Xu, Sheng Yong Xu, Gary Paradee, Bradley A. Lewis, Michael D. Gerhold

Research output: Contribution to journalArticlepeer-review

41 Scopus citations


We report in this paper our studies on the photoconductivity and photovoltaic effects of colloidal PbSe nanocrystal quantum dots (NQDs) which were embedded in conductive polymer matrices to form hybrid polymer/NQD Infrared photodiodes. The generation of photocarriers in PbSe NQDs and their transport in NQD-polymer composites were described by a simplified band diagram picture of the device. Both photocurrent and photovoltage outputs were measured from the NQD-incorporated photodiode upon the illumination of near-infrared (NIR) light, whereas the net polymer-based devices do not exhibit any photoresponsivity. The Intensity dependence of the photocurrent indicates the pseudomonomolecular recombination kinetics in the NQD-polymer composite. The measured photocurrent spectrum is consistent with the absorption characteristic of PbSe NQDs. Further enhancement of the photodiode efficiency can be achieved by engineering the nanocrystal surface to reduce the potential barriers due to the ligant capping molecules.

Original languageEnglish (US)
Article number1652852
Pages (from-to)362-367
Number of pages6
JournalIEEE Transactions on Nanotechnology
Issue number4
StatePublished - Jul 2006

All Science Journal Classification (ASJC) codes

  • Computer Science Applications
  • Electrical and Electronic Engineering


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