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Joel Ager

Staff Scientist in Materials Sciences Division of Lawrence Berkeley National Laboratory; Adjunct Professor in the Materials Science and Engineering Department, UC Berkeley.  Principal Investigator in the Electronic Materials Program and in the Singapore Berkeley Initiative for Sustainable Energy (SinBeRISE); Principal Investigator in the Joint Center for Artificial Photosynthesis (JCAP)

Lawrence Berkeley National Laboratory
One Cyclotron Road, Mailstop 2R0200
Berkeley, CA 94720
USA

Location:2-0211
Telephone:(510) 486-6715
FAX:(510) 486-4995
Email:jwager@lbl.gov


Research Centers:

http://solarfuelshub.org/

The Joint Center for Artificial Photosynthesis (JCAP) is one of the Department of Energy Innovation Hubs. Its mission is to generate carbon-neutral fuels efficiently using only sunlight and water or carbon dioxide and sustainable materials. A number of CSD scientists participate in JCAP, working on catalysts, transformations using materials assemblies, and interfacial chemistry.


Research Interests:

Dr. Ager’s research interests include the fundamental electronic and transport characteristics of photovoltaic materials, development of new photoanodes and photocathodes based on abundant elements for solar fuels production, and the development of new oxide- and sulfide-based transparent conductors.

In JCAP, Dr. Ager is investigating interactions of carbon-based supports with CO2-reduction electrocatalysts.  His group is studying nanostructured III-V semiconductor absorbers with minority carrier selective interfaces for efficient and stable operation under CO2RR conditions.  The fundamentals of new test beds for sustained CO2production and product separation is also investigated.



Relevant Publications

Recent EMAT publications:

  • Desai, Sujay B, Gyungseon Seol, Jeong Seuk Kang, Hui Fang, Corsin Battaglia, Rehan Kapadia, Joel W Ager, Jing Guo, and Ali Javey, 2014, “Strain-Induced Indirect to Direct Bandgap Transition in Multilayer WSe2,” Nano Lett. 14, 4592–4597
  • R. Kapadia, Z. Yu, H.-H.H. Wang, M. Zheng, C. Battaglia, M. Hettick, D. Kiriya, K. Takei, P. Lobaccaro, J.W. Beeman, J.W. Ager, R. Maboudian, D.C. Chrzan, and A. Javey, 2013, “A Direct Thin-Film Path towards Low-Cost Large-Area III-V Photovoltaics.,” Sci. Rep.  3, 2275.
  • N. Miller, J. W. Ager III, H. M. Smith III,  M. A. Mayer, K. M. Yu,  E. E. Haller, W. Walukiewicz, W. J. Schaff, C. Gallinat, G. Koblmüller, and J. S. Speck, “Hole transport and photoluminescence in Mg-doped InN,” J. Appl. Phys 107, 113712 (2010).
  • K. Wang,  N. Miller, R. Iwamoto, T. Yamaguchi, M. A. Mayer, T. Araki, Y. Nanishi, K. M. Yu, E. E. Haller, W. Walukiewicz, and J. W. Ager III, “Mg doped InN and confirmation of free holes in InN,” Appl. Phys. Lett. 98, 042104 (2011).
  • N. Miller, E. E. Haller, G. Koblmüller, C. Gallinat, J. S. Speck, W. J. Schaff, M. E. Hawkridge, K. M. Yu, and J. W. Ager III, Effect of charged dislocation scattering on electrical and electrothermal transport in n-type InN, Phys. Rev. B 84, 075315 (2011). 
  • E. Alarcón-Lladó, M. A. Mayer, B. W. Boudouris, R. A. Segalman, N. Miller, T. Yamaguchi, K. Wang, Y. Nanishi, E. E. Haller, and J. W. Ager, “PN junction rectification in electrolyte gated Mg-doped InN,” Appl. Phys. Lett. 99, 102106 (2011).
  •  Zhiyong Fan, Haleh Razavi, Jae-won Do, Aimee Moriwaki, Onur Ergen, Yu-Lun Chueh, Paul W. Leu, Johnny C. Ho, Toshitake Takahashi, Lothar A. Reichertz, Gregory F. Brown, Steven Neale, Kyoungsik Yu, Ming Wu, Junqiao Wu, Joel W. Ager, and Ali Javey, “Three dimensional nanopillar array photovoltaics on low cost and flexible substrates,” Nature Materials 8, 648- 653 (2009). 
  • J. W. Ager III, N. Miller, R. E. Jones, K. M. Yu, J. Wu, W. J. Schaff, and W. Walukiewicz, “ Mg-doped InN and InGaN – photoluminescence, capacitance-voltage and thermopower measurements,” phys. stat. sol. (b) 245, 873–877 (2008).
  • J. J. L. Morton, A. M. Tyryshkin, R. M. Brown, S. Shankar, B. W. Lovett, A. Ardavan, T. Schenkel, E. E. Haller, J. W. Ager, and S. A. Lyon, “Solid state quantum memory using the 31P nuclear spin,” Nature 455, 1085 (2008)

Recent publications from other LBNL efforts:

  • Chen, L., Toma, F. M., Cooper, J. K., Lyon, A., Lin, Y., Sharp, I. D., & Ager, J. W. (2015). Mo-Doped BiVO 4 Photoanodes Synthesized by Reactive Sputtering. ChemSusChem, 8, 1066–1071. http://doi.org/10.1002/cssc.201402984
  • Ager III, J. W., Shaner, M., Walczak, K., Sharp, I. D., & Ardo, S. (2015). Experimental Demonstrations of Spontaneous, Solar-Driven Photoelectrochemical Water Splitting. Energy Environ. Sci. http://doi.org/10.1039/C5EE00457H
  • Modestino, M. A., Walczak, K. A., Berger, A., Evans, C. M., Haussener, S., Koval, C., Ager, J. W. and Segalman, R. A. (2014). Robust production of purified H2 in a stable, self-regulating, and continuously operating solar fuel generator. Energy Environ. Sci., 7(1), 297–301. http://doi.org/10.1039/C3EE43214A
  • Sathre, R., Scown, C. D., Morrow, W. R., Stevens, J. C., Sharp, I. D., Ager, J. W., … Greenblatt, J. B. (2014). Life-cycle net energy assessment of large-scale hydrogen production via photoelectrochemical water splitting. Energy Environ. Sci., 7(10), 3264–3278. http://doi.org/10.1039/C4EE01019A
  • Chen, L., Alarcón-Lladó, E., Hettick, M., Sharp, I. D., Lin, Y., Javey, A., & Ager, J. W. (2013). Reactive Sputtering of Bismuth Vanadate Photoanodes for Solar Water Splitting. The Journal of Physical Chemistry C, 117(42), 21635–21642. http://doi.org/10.1021/jp406019r
  • Lin, Y., Battaglia, C., Boccard, M., Hettick, M., Yu, Z., Ballif, C., Ager, J. W., and  Javey, A. (2013). Amorphous Si thin film based photocathodes with high photovoltage for efficient hydrogen production. Nano Letters, 13(11), 5615–8. http://doi.org/10.1021/nl403265k
  • Modestino, M. A., Diaz-Botia, C. A., Haussener, S., Gomez-Sjoberg, R., Ager, J. W., & Segalman, R. A. (2013). Integrated microfluidic test-bed for energy conversion devices. Phys. Chem. Chem. Phys., 15(19), 7050–7054. http://doi.org/10.1039/C3CP51302E
  • Lee, M. H., Takei, K., Zhang, J., Kapadia, R., Zheng, M., Chen, Y.-Z., Ager, J. W. and  Javey, A. (2012). p-Type InP Nanopillar Photocathodes for Efficient Solar-Driven Hydrogen Production. Angewandte Chemie International Edition, 51(43), 10760–10764. http://doi.org/10.1002/anie.201203174
  • J. Seidel, D. Fu, S.-Y. Yang, E. Alarcón-Lladó, J. Wu, R. Ramesh, and J. W. Ager III, “Efficient photovoltaic current generation at ferroelectric domain walls,” Phys. Rev. Lett. 107, 126805 (2011).
  • S. Y. Yang, J. Seidel, S. J. Byrnes, P. Shafer, C.-H. Yang, M. D. Rossell, P. Yu, Y.-H. Chu, G. Catalan, J. F. Scott, J. W. Ager III, L. W. Martin, and R. Ramesh, “Above-bandgap voltages from ferroelectric photovoltaic devices,” Nature Nanotechnology 5, 143-147 (2010).  
  • L. A. Reichertz, I. Gherasoiu, K. M. Yu, V. M. Kao, W. Walukiewicz, and J. W. Ager III, “Demonstration of a III-nitride/silicon tandem solar cell,” Appl. Phys. Express 2 122202 (2009).