1523 Il inois St, Meyer Hall, Golden, CO 80401
[email protected] [email protected] http://www.its.caltech.edu/~ewarren EDUCATION California Institute of Technology, Pasadena CA
• Dissertation: “Silicon microwire arrays for photoelectrochemical and photovoltaic applications” • Advisor: Dr. Nate Lewis (co-advisor: Dr. Harry Atwater), GPA: 3.6/4.0 University of Cambridge, Cambridge, UK
• M. Phil, Engineering for Sustainable Development, Advisor: Dr. Rod Lynch
• Dissertation: “In-situ remediation of groundwater pollution using photocatalysis”
Cornell University, College of Engineering, Ithaca NY
• B.S., Chemical and Biomolecular Engineering, magna cum laude
• GPA: 3.8/4.0; Dean’s List; John McMullen Dean’s Scholar, Tau Beta Pi
RESEARCH EXPERIENCE National Renewable Energy Lab/Colorado School of Mines, Postdoctoral Scholar
• Design and experimental testing of concentrated solar/thermoelectric systems
California Institute of Technology, PhD Candidate
• Fabricated silicon microwire photovoltaic cells and photocathodes for solar-driven water splitting • Developed catalyst deposition techniques for microstructured semiconductor electrodes • Photoelectrochemical testing of semiconductor materials using viologen redox couples • Optimized CVD growth of Si microwires using the vapor-liquid-solid (VLS) process • Developed micro-imprint lithography and electrodeposition techniques to control the patterned growth of silicon microwires • Investigated the material and electrical properties of VLS silicon microwires grown from electrodeposited Cu • Studied the heterogeneous catalyst/semiconductor interface for a variety of hydrogen evolution catalysts through
electrodepositon, electrochemical characterization, and semiconductor device modeling.
• Contributed to multiple grant proposals and reports (DOE-BES, DARPA, ARPA-E, Betty and Gordon Moore Foundation)
University of Cambridge, M.Phil Candidate
• Combined laboratory and field research to investigate charge transfer during the photo-excitation of titanium dioxide for the
• Modeled in-situ groundwater cleanup for a photocatalytic reactor and created a model to predict the change in pollutant
concentration downstream of the remediation site.
Cornell University, Undergraduate Researcher; Advisor: Dr. Ruth Richardson
• Investigated the biodegradation of chloroethenes by bacterial communities, specifically Dehalococcoides ethenogenes • Created metagenomic fosmid DNA libraries of dechlorinating anaerobic microbial communities
• MRS Gold Award, Material Research Society Spring 2012 Meeting • Constantin G. Economou Prize, Caltech, 2009 (Awarded for best Candidacy Research in Chemical Engineering Department) • Overseas Trust Fellowship, Cambridge University, 2006 • Member, Tau Beta Pi, Inducted Fall, 2004 • Merck Engineering and Technology Fellowship 2002 – 2004, (national award ~30 per year) • Cornell: John McMullen Dean’s Scholar (2001-2005), Engineering Dean’s List (2001-2004)
WORK EXPERIENCE LMI (McLean, VA), Energy and Environment Intern
• Analyzed the Department of Defense’s non-tactical biofuel consumption and used GIS software to determine the most
effective sites for new biofuel infrastructure
• Wrote a chapter of the DoD’s report to Congress on current and projected biofuel utilization in military vehicles.
Piedmont Biofuels (Pittsboro, NC) Intern
• Worked with a team on all aspects of the biodiesel production process: collecting waste oil, reactor design, fuel analysis • Ran education outreach programs for farmers in North Carolina about the benefits of using biodiesel and growing oil crops
Corning Inc. (Corning, NY), Intern
• Studied the relationship between nano-scale surface roughness and performance at the silicon/gate-oxide interface in thin film
transistors and completed a comparative analysis of cleaning technologies for single crystal silicon films on glass substrates
Merck & Co. Inc. (Elkton, VA; West Point, PA), Merck Engineering and Technology Fel ow
• Supported recombinant vaccine fermentation manufacturing and optimized parameters for RECOMBIVAX HB® and HPV
• Worked with a team to optimize the fermentation processes of Lovastatin and developed molecular methods for Simvastatin
LEADERSHIP Caltech Board of Trustees, Graduate Student Advisor
• One of two graduate student representatives for the Student Experience Committee for the Caltech Board of Trustees
Caltech Housing, Resident Associate
• One of three resident associates for Caltech graduate apartment complex with over 400 residents
Caltech Gardening Society
• Founding member of the Caltech Community Garden, which created an organic garden on the Caltech campus • Responsible for membership management, (~30 active gardeners), dues, and organizing 2-3 workday events each year
Society of Women Engineers Cornel , Co-President (2004-2005)
• Worked closely with administration, corporate sponsors, and student members to lead Cornell’s largest undergraduate
engineering student organization (approximately 250 active members).
PUBLICATIONS
1. Warren, EL; Lewis, NS. “Silicon Microwire Arrays for Solar Energy Conversion Applications” J. Phys Chem, submitted (2013).
2. Warren, EL; McKone, JR; Atwater, HA; Gray, HB; Lewis, NS. “Hydrogen Evolution Characteristics of Ni-Mo-Coated Radial
Junction n+p-Silicon Microwire Array Photocathodes.” Energy Environ. Sci, 5, 9653-9661 (2012).
3. Warren, EL; Turner-Evans, DB; Atwater, HA; Lewis, NS. (2012). “Photoelectrochemical Characterization of Si Microwire
Array Solar Cells.” Proceedings of the 38th IEEE Photovoltaics Specialist Conference.
4. Tamboli, AC; Chen C; Warren, EL; Turner-Evans, DB, Kelzenberg, MD, Lewis, NS, Atwater, HA. “Wafer-Scale Growth of
Silicon Microwire Arrays for Photovoltaics and Solar Fuel Generation.” J. Photovoltaics. 2, 294-297, (2012).
5. McKone, JR; Warren, EL; Bierman, MJ; Boettcher, SW; Brunschwig, BS; Lewis, NS; Gray, HB. "Evaluation of Pt, Ni, and
Ni-Mo electrocatalysts for hydrogen evolution on crystalline Si electrodes," Energy Environ. Sci. (2011).
6. Kosten, E.D.; Warren, EL.; Atwater, HA, "Ray optical light trapping in silicon microwires: exceeding the 2n2 intensity limit." Opt. Express 2011, 19, 3316-3331.
7. Warren, EL; Boettcher, SW; Walter MG; Atwater, HA, and Lewis, NS. "pH Independent, 520 mV Open-Circuit Voltages of
Si/Methyl Viologen2+/+ Contacts Through Use of Radial Junction n+p-Si Microwire Arrays Photoelectrodes" J. Phys. Chem C.
8. Boettcher, SW, Warren, EL; Putnam, MC; Santori, EA; Turner-Evans, DT; Kelzenberg MD, Walter, MG; McKone, JR;
Brunschwig, BS; Atwater, HA; and Lewis, NS. " Photoelectrochemical hydrogen evolution using Si microwire arrays," J. Am. Chem Soc. Articles ASAP (2011).
9. Walter, MG, Warren, EL; McKone, JR; Boettcher, SW; Mi, Q; Santori, EA; and Lewis, NS. "Solar Water Splitting Cells," Chem. Rev.110 (11), 6446-6473 (2010).
10. Putnam, MC; Boettcher, SW; Kelzenberg, MD; Turner-Evans, DB; Spurgeon, JM; Warren, EL; Briggs, RM; Lewis, NS;
Atwater, HA. Si microwire-array solar cells. Energy & Environmental Science3, 1037-1041 (2010).
11. Warren, EL; Boettcher, SW; McKone, JR; Lewis, NS. “Photoelectrochemical water splitting: silicon photocathodes for
hydrogen evolution. Proc. SPIE 7770, 7770-51 (2010).
12. Kelzenberg, MD; Boettcher, SW; Petykiewicz, JA; Turner-Evans, DB; Putnam, MC; Warren, EL; Spurgeon, JM; Briggs, RM;
Lewis, NS; Atwater, HA. “Enhanced absorption and carrier collection in Si wire arrays for photovoltaic applications.” Nature Materials.9, 239-244. (2010)
13. Boettcher, SW; Spurgeon, JM; Putnam, MC; Warren, EL; Turner-Evans, DB; Kelzenberg, MD; Maiolo, JR; Atwater, HA;
Lewis, NS. “Energy-Conversion Properties of Vapor-Liquid-Solid-Grown Silicon Wire-Array Photocathodes.” Science (2010).
14. Patents: US 2012/0313073 A1, US 2011/0126892 A1 ORAL PRESENTATIONS
• Warren, EL; McKone, JR; Shaner, MR; Gray, HB; Atwater, HA; Lewis, NS. “Silicon Microwires Coupled to Earth Abundant
Catalysts as Photocathodes for the Hydrogen Evolution Reaction”. 222nd Electrochemical Society Meeting, October, 2012.
• Warren, EL; McKone, JR; Gray, HB; Atwater, HA; Lewis, NS. “Solar Fuel Generation from Earth-abundant Silicon
Microwire/Ni-Mo Photocathodes. N3.7 Material Research Society April 2012.
• Warren, EL; Boettcher, SW, J; Walter, MG; Atwater, HA; Lewis, NS. “Radial Junction Silicon Microwire Photocathodes.” EE1.11 Material Research Society April 2011.
• Warren, EL; Boettcher, SW; McKone, JR; Lewis, NS. “Photoelectrochemical water splitting: silicon photocathodes for
hydrogen evolution.” SPIE, August, 2010
• Warren, EL “Si microwires for photoelectrochemical water splitting.” Resnick/Parsons Sustainable Energy & Infrastructure Forum,
California Institute of Technology, September 2010.
• Warren, EL; "Photoelectrochemical energy production from silicon microwires" Constantine Economou Memorial Lecture,
California Institute of Technology, June 2010.
• Warren, EL; Ku J; Boettcher SW; Spurgeon JM; Kelzenberg, MDl ; Atwater, HA; Lewis, NS. “Fabrication and characterization
of large diameter VLS Si microwire arrays from electrodeposited catalysts.” P5.4 Material Research Society April 2010.
• Warren, EL; “Photoelectrochemical Hydrogen Production from VLS-Grown Silicon Microwire Arrays.” Inorganic- Organometal ic Seminar, California Institute of Technology, 2010.
POSTER PRESENTATIONS Warren, EL; McKone, JR, Gray, HB; Lewis, NS. “Silicon Microwires Coupled to Earth Abundant Catalysts as Photocathodes for the Hydrogen Evolution Reaction,” IPS-19, Pasadena, CA 2012. Warren, EL; Turner-Evans, DB, Grimm, RL, Atwater, HA; Lewis, NS. “Photo electrochemical characterization of solar materials,” PVSC 39, Austin, TX, 2012. Warren, EL; McKone, JR; Atwater, HA; Lewis, N.S. (2008). Microstructured p-Si Photocathodes for Photoelectrochemical Hydrogen Production. Gordon Research Seminar, Ventura CA, 2011. Warren, EL; McKone, JR; Lewis, NS. (2008). “Microstructured p-Si Photocathodes for Photoelectrochemical Hydrogen
Production.” GCEP Research Symposium, Stanford CA, September 2010. Warren, EL; Boettcher, SW; Atwater, HA; Lewis, N.S. (2008). Microstructured p-Si Photocathodes for Photoelectrochemical Hydrogen Production. Gordon Research Seminar, Ventura CA, 2009. Warren, EL; Boettcher, SW; O’Leary, LE; Atwater, HA; Lewis, NS. Design and Surface Functionalization of Structured Semiconductor Photoelectrodes. GCEP Research Symposium. Stanford, CA, 2008.
TEACHING
• Teaching Assistant for Chemical Engineering Laboratory, Dr. Michael Vici, Caltech
• Teaching Assistant for Chemical Engineering Thermodynamics, Dr. Zhen-Gang Wang, Caltech
• Teaching Assistant for Introduction to Chemical Engineering, Dr. T. M. Duncan, Cornell
• Mentored two students in the Caltech Summer Undergraduate Research Fellowship Program
2009 - 2011 PROFESSIONAL ACTIVITIES Editing Experience
• American Journal Experts Contract Editor (2013 – Present)
Referee Experience
• Invited reviewer for: Energy & Environmental Science (2012-Present)
Professional Society Membership
• The Materials Research Society, The Electrochemical Society, Tau Beta Pi
• Device fabrication: photolithography, electron-beam lithography, nano-imprint lithography, electron-beam/thermal
evaporation, DC ion-beam/RF-magnetron sputter deposition, metal electrodepositon, chemical vapor deposition of Si, wet semiconductor processing
• Measurement techniques: photoelectrochemistry, electrochemistry, scanning electron microscopy, solar cell device testing
(electrical measurements and spectral response), atomic force microscopy, profilometry, ellipsometry, confocal microscopy, atomic force microscopy, x-ray photoelectron spectroscopy
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