Eric Hoke

Associate Director
Center for Advanced Molecular Photovoltaics, Stanford University

personal photo
Mailing
Address
McCullough Building 220
476 Lomita Mall
Stanford, CA 94305
Phone 650-721-1833
E-Mail erichoke@stanford.edu



Organic photovoltaics offer the potential of providing solar energy at a significantly lower cost than conventional technologies, as they can be mass produced in a fashion similar to newspaper printing and can be made from thin films of abundant, non-toxic materials. Organic solar cells have rapidly improved in efficiency over the last few years and have recently achieved power conversion efficiencies of over 10%. Organic solar cells also can produce voltages larger than many inorganic solar cells. This opens the possibility of inexpensively laminating organic devices on top of thin-film inorganic solar cells, creating a hybrid multijunction solar cell that is more efficient than the separate devices, and potentially more than 20% efficient.

During my PhD I investigated the recombination mechanisms which place practical limitations of how much current and voltage can be produced by polymer-fullerene based organic photovoltaics with Prof. Michael McGehee. I also helped engineer a new device architecture for dye sensitized solar cells that mimics photosynthesis by using multiple dyes which relay energy to a central sensitizing dye by a mechanism known as Forster resonant energy transfer. Prior to Stanford, I researched light-matter interactions with Eric Mazur's photonics lab at Harvard, granular physics with Heinrich Jaeger at the University of Chicago, and wrote my Masters Thesis on nanoparticle (CdTe)-polymer blend solar cells at Cambridge University with Neil Greenham.


Research Interests

  • Voltage losses in solar cells
  • Low cost materials for the high voltage junction of multijunction solar cells
  • Advanced metrologies for the characterization of photovoltaic materials
  • Organic electronics
  • Global climate change

  • Education

    PhD, Applied Physics (2012)
    McGehee Group, Center for Advanced Molecular Photovoltaics
    Stanford University
    Stanford, CA

    MPhil, Physics (2007)
    Optoelectronics Group, Cavendish Laboratory
    University of Cambridge
    Cambridge, UK
    Thesis: Charge and Energy Transfer in Nanocrystal-Polymer Blends (pdf)

    B.A., Summa Cum Laude, Chemistry and Physics (2006)
    Harvard University
    Cambridge, MA


    Fellowships

    Hertz Foundation Fellowship (2007-2012)
    National Science Foundation GRFP Fellowship (2007-2010)
    Stanford Graduate Fellowship (2007-2012)
    Herchel Smith Harvard Scholarship to Cambridge University (2006-2007)


    Selected Publications

    A complete listing can be found here.
    Recombination in polymer:fullerene solar cells with open circuit voltages approaching and exceeding 1.0 V. Eric T. Hoke, et al. Advanced Energy Materials (2012) DOI: 10.1002/aenm.201200474. (pdf)

    The role of electron affinity in determining whether fullerenes catalyze or inhibit photo-oxidation of polymers. Eric T. Hoke, et al. Advanced Energy Materials (2012) DOI: 10.1002/aenm.201200169. (pdf)

    Morphology-Dependent Trap Formation in High Performance Polymer Bulk Heterojunction Solar Cells. Zach M. Beiley, Eric T. Hoke, et al. Advanced Energy Materials 1 (2011) 954. (pdf)

    Incorporating Multiple Energy Relay Dyes in Liquid Dye-Sensitized Solar Cells. Jun-Ho Yum, Brian E. Hardin, Eric T. Hoke, et al., ChemPhysChem, 12 (2011) 657. (pdf)

    High Excitation Transfer Efficiency from Energy Relay Dyes in Dye-Sensitized Solar Cells. Brian E. Hardin, Jun-Ho Yum, Eric T. Hoke, et al. Nanoletters, 10 (2010) 3077. (pdf)

    Accounting for Interference, Scattering, and Electrode Absorption to Make Accurate Internal Quantum Efficiency Measurements in Organic and Other Thin Solar Cells. George F. Burkhard, Eric T. Hoke, and Michael D. McGehee, Advanced Materials, 22 (2010) 3293. (pdf)

    Modeling the efficiency of Förster resonant energy transfer from energy relay dyes in dye-sensitized solar cells. Eric T. Hoke, Brian E. Hardin, and Michael D. McGehee, Optics Express, 18 No. 4 (2010) 3893. (pdf)

    Incomplete Exciton Harvesting from Fullerenes in Bulk Heterojunction Solar Cells. George F. Burkhard, Eric T. Hoke, Shawn R. Scully, and Michael D. McGehee, Nanoletters, 9 (2009) 4037. (pdf)

    Increased light harvesting in dye-sensitized solar cells with energy relay dyes. Brian E. Hardin, Eric T. Hoke, et al., Nature Photonics, 3 (2009) 406. (pdf)

    Temporal force fluctuations measured by tracking individual particles in granular materials under shear. Eric I. Corwin, Eric T. Hoke, Heinrich M. Jaeger and Sidney Nagel, Physical Review E, 77 (2008) 061308. (pdf)

    Conference Talks

    Recombination mechanisms in high voltage polymer-fullerene bulk heterojunction solar cells. Materials Research Society, San Francisco, April 2012.

    Molecular Packing in Bulk Heterojunction Solar Cells. Photovoltaics at the Nanoscale, Hasselt, Belgium, October 2011.

    Why fullerenes make excellent organic photovoltaic acceptor materials: Implications of low exchange energy. European Materials Research Society (EMRS), Nice, France and Hybrid and Organic Photovoltaics (HOPV), Valencia, Spain, May 2011.

    Voltage Dependence of the Internal Quantum Efficiency in Bulk-heterojunction Solar Cells. Materials Research Society, Boston, November 2010.

    Using Long Range Forster Energy Transfer to Increase Light Harvesting in Liquid and Solid-state Dye-sensitized Solar Cells. Materials Research Society, San Francisco, April 2010.


    Races!

    Boston Marathon
    April 19, 2004
    3:55:29 (unofficial)
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    Boston Marathon
    April 18, 2005
    3:27:23
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    Philadelphia Distance Run (Half)
    September 18, 2005
    1:27:32
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    Boston Marathon
    April 17, 2006
    3:25:56
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    Bay to Breakers (12K)
    May 18, 2008
    58:15
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    San Francisco Marathon
    August 3, 2008
    3:28:21
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    Pacific Grove Olympic Distance Triathlon
    September 12, 2009
    43:38 swim / 1:19:15 bike / 44:37 run
    2:56:55 overall
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