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Lateral heterojunction photodetector consisting of molecular organic and colloidal quantum dot thin films

Author(s)
Osedach, Timothy Paul; Geyer, Scott Mitchell; Ho, John C.; Arango, Alexi C.; Bawendi, Moungi G.; Bulovic, Vladimir; ... Show more Show less
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Abstract
We demonstrate a heterojunction photodetector of lateral geometry that utilizes an evaporated film of the hole-transporting molecular material N,N′-bis(3-methylphenyl)-N,N′-bis(phenyl)-9,9-spirobifluorene (spiro-TPD) as a charge transport layer and that is sensitized across visible wavelengths by a thin film of colloidal CdSe nanocrystal quantum dots (QDs). High photon-to-electron quantum conversion efficiencies are obtained at room temperature as a result of photoconductive gain. With an electric field of 3.0×10[superscript 5] V/cm applied across the electrodes, we measure the external quantum efficiency at the first QD absorption peak (at wavelength λ = 590 nm) to be 13%, corresponding to an internal quantum efficiency of approximately 80%. The operating mechanism of these devices is discussed, noting that the optical response is dominated by the QD absorption spectrum while the charge transport nearly exclusively takes place in the spiro-TPD.
Date issued
2009-01
URI
http://hdl.handle.net/1721.1/58589
Department
Massachusetts Institute of Technology. Department of Chemical Engineering; Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Research Laboratory of Electronics
Journal
Applied Physics Letters
Publisher
American Institute of Physics
Citation
Osedach, Tim P. et al. “Lateral heterojunction photodetector consisting of molecular organic and colloidal quantum dot thin films.” Applied Physics Letters 94.4 (2009): 043307-3. © 2009 American Institute of Physics
Version: Final published version
ISSN
0003-6951
1077-3118
Keywords
visible spectra, semiconductor thin films, semiconductor quantum dots, semiconductor heterojunctions, photodetectors, photoconductivity, organic compounds, nanostructured materials, II-VI semiconductors, hole mobility, electrodes, colloids, cadmium compounds

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