TITLE

Photoconductivity from PbS-nanocrystal/semiconducting polymer composites for solution-processible, quantum-size tunable infrared photodetectors

AUTHOR(S)
McDonald, S. A.; Cyr, P. W.; Levina, L.; Sargent, E. H.
PUB. DATE
September 2004
SOURCE
Applied Physics Letters;9/13/2004, Vol. 85 Issue 11, p2089
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We report photoconductivity at infrared wavelengths, 975–1300 nm, from a polymer/nanocrystal quantum dot composite. Biased films of the conjugated polymer poly[2-methoxy-5-(2′-ethylhexyloxy-p-phenylenevinylene)] (MEH-PPV) sensitized with PbS nanocrystals (∼5 nm diameter) demonstrate photocurrent at wavelengths beyond the response of the polymer and corresponding to the absorption of the nanocrystals. The photocurrent is attributed to absorption in the nanocrystals with subsequent hole transfer to the polymer and had an internal quantum efficiency of ∼5×10-6 to ∼10-5 charges/photon at 5 V bias.
ACCESSION #
14434567

 

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