Colloidal quantum dots based infrared photodiodes

Jian Xu, Dehu Cui, Shengyong Xu, Gary Paradee, Michael Gerhold

Research output: Chapter in Book/Report/Conference proceedingConference contribution


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. copyright The Electrochemical Society.

Original languageEnglish (US)
Title of host publicationPhotovoltaics for the 21st Century III
PublisherElectrochemical Society Inc.
Number of pages15
ISBN (Electronic)9781566774888
StatePublished - 2006
EventPhotoboltaics for the 21st Century III - 208th Electrochemical Society Meeting - Los Angeles, CA, United States
Duration: Oct 16 2005Oct 21 2005

Publication series

NameECS Transactions
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737


OtherPhotoboltaics for the 21st Century III - 208th Electrochemical Society Meeting
Country/TerritoryUnited States
CityLos Angeles, CA

All Science Journal Classification (ASJC) codes

  • Engineering(all)


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