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Applied Physics Letters / Volume 100 / Issue 4 / NANOSCALE SCIENCE AND TECHNOLOGY

Appl. Phys. Lett. 100, 043101 (2012); http://dx.doi.org/10.1063/1.3678039 (4 pages)

Plasmonic light trapping leads to responsivity increase in colloidal quantum dot photodetectors

F. Pelayo García de Arquer, Fiona J. Beck, María Bernechea, and Gerasimos Konstantatos

ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860 Castelldefels, Barcelona, Spain

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(Received 4 November 2011; accepted 22 December 2011; published online 23 January 2012)

We report broadband responsivity enhancement in PbS colloidal quantum dot (CQDs) photoconductive photodetectors due to absorption increase offered by a plasmonic scattering layer of Ag metal nanoparticles. Responsivity enhancements are observed in the near infrared with a maximum 2.4-fold increase near the absorption band edge of ∼1 μm for ∼400 nm thick devices. Additionally, we study the effect of the mode structure on the efficiency of light trapping provided by random nanoparticle scattering in CQD films and provide insights for plasmonic scattering enhancement in CQD thin films.

© 2012 American Institute of Physics

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KEYWORDS, PACS, and IPC

Keywords

colloidal crystals, infrared spectra, IV-VI semiconductors, lead compounds, metallic thin films, nanoparticles, photodetectors, plasmonics, semiconductor quantum dots, silver

PACS

  • 85.60.Gz

    Photodetectors (including infrared and CCD detectors)

International Patent Classification (IPC)

  • B82B1/00

    Nano-structures

  • G01J1/00

    Photometry, e.g. photographic exposure meter

  • H01L31/101

    Devices sensitive to infra-red, visible or ultra-violet radiation

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3678039

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    S. Cosentino, P. Liu, S. T. Le, S. Lee, D. Paine, A. Zaslavsky, D. Pacifici, S. Mirabella, M. Miritello, I. Crupi et al., Appl. Phys. Lett. 98, 221107 (2011)APPLAB000098000022221107000001.

    J. M. Shieh, W. C. Yu, J. Y. Huang, C. K. Wang, B. T. Dai, H. Y. Jhan, C. W. Hsu, H. C. Kuo, F. L. Yang, and C. L. Pan, Appl. Phys. Lett. 94, 241108 (2009)APPLAB000094000024241108000001.

    K. R. Catchpole and S. Pillai, J. Appl. Phys. 100, 044504 (2006)JAPIAU000100000004044504000001.

    K. Nakayama, K. Tanabe, and H. A. Atwater, Appl. Phys. Lett. 93, 121904 (2008)APPLAB000093000012121904000001.

    F. J. Beck, S. Mokkapati, A. Polman, and K. R. Catchpole, Appl. Phys. Lett. 96, 033113 (2010)APPLAB000096000003033113000001.

    F. J. Beck, A. Polman, and K. R. Catchpole, J. Appl. Phys. 105, 114310 (2009)JAPIAU000105000011114310000001.


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