Joel Varley

Contact information:

Lawrence Livermore National Laboratory
7000 East Avenue, L-413
Livermore, CA 94550
email: varley2@llnl.gov
phone: 
fax: 925-422-6594

Education:

  • Ph.D. in Physics, University of California, Santa Barbara, 2011
  • B.S. in Physics, University of North Carolina, Chapel Hill, 2005

Research interests:

  • Tailoring electronic and optical properties of semiconductors and insulators via defect-engineering
  • CO2/CO reduction inspired by nature; enzyme catalysis

Some recent publications:

  • Vacancies and small polarons in SrTiO3, A. Janotti, J.B. Varley, M. Choi, C.G. Van de Walle, Phys. Rev. B 90, 085202 (2014).
  • Intermixing at the absorber-buffer layer interface in thin-film solar cells: The electronic effects of point defects in Cu(In,Ga)(Se,S)2 and Cu2ZnSn(Se,S)4 devices, J.B. Varley, V. Lordi, J. Appl. Phys. 116, 063505 (2014).
  • Electronic structure and defect properties of B6O from hybrid functional and many-body perturbation theory calculations: A possibly ambipolar transparent conductor, J.B. Varley, V. Lordi, A. Miglio, G. Hautier Phys. Rev. B 90, 045205 (2014).
  • Hydrogenated vacancies and hidden hydrogen in SrTiO3, J.B. Varley, A. Janotti, C.G. Van de Walle, Phys. Rev. B 89, 075202 (2014).
  • Lithium and oxygen vacancies and their role in Li2O2 charge transport in Li-O2 batteries, J.B. Varley, V. Viswanathann, J.K. Nørskov, A.C. Luntz, Energy Environ. Sci. 7, 720 (2014).
  • Ni–Fe–S cubanes in CO2 reduction electrocatalysis: A DFT study, J.B. Varley, H.A. Hansen, N.L. Ammititzbøll, L.C. Grabow, A.A. Peterson, J.K. Nørskov, ACS Catal. 3, 2640 (2013). 
  • Electrical properties of point defects in CdS and ZnS, J.B. Varley, V. Lordi, Appl. Phys. Lett. 103, 102103 (2013).
  • Ambipolar doping in SnO, J.B. Varley, A. Schleife, A. Janotti, C.G. Van de Walle, Appl. Phys. Lett. 103, 082118 (2013).
  • Dual behavior of excess electrons in rutile TiO2, A. Janotti, C. Franchini, J.B. Varley, C.G. Van de Walle, Phys. Stat. Sol. RRL 7, 3 (2013).
  • Understanding trends in the electrocatalytic activity of metals and enzymes for CO2 reduction to CO, H.A. Hansen, J.B. Varley, A.A. Peterson, J.K. Nørskov, Phys. Chem. Lett. 4, 388 (2013).
  • First-principles calculations of Fischer-Tropsch processes catalyzed by nitrogenase enzymes, J.B. Varley, J.K. Nørskov, ChemCatChem 5, 732 (2012).
  • Role of self-trapping in luminescence and p-type conductivity of wide-band-gap oxides, J.B. Varley, A. Janotti, C. Franchini, C.G. Van de Walle, Phys. Rev. B 85, 081109(R) (2012).
  • Hydrogenated cation vacancies in semiconducting oxides, J.B. Varley, H. Peelaers, A. Janotti, C.G. Van de Walle, J. Phys.: Condens. Matter 23, 334212 (2011).
  • Mechanism of visible-light photocatalysis in nitrogen-doped TiO2, J.B. Varley, A. Janotti, C.G. Van de Walle, Advanced Materials 23, 2343 (2011).
  • Defects in SiC for quantum computing, J.R. Weber, W.F. Koehl, J.B. Varley, A. Janotti, B.B. Buckley, C.G. Van de Walle, D.D. Awschalom, J. Appl. Phys. 109, 102417 (2011); Vir. J. Nan. Sci. & Tech. 23, 23 (2011); Vir. J. Quantum Inf. 11, 6 (2011).
  • Tin dioxide from first principles: Quasiparticle electronic states and optical properties, A. Schleife, J.B. Varley, F. Fuchs, C. Rodl, F. Bechstedt, P. Rinke, A. Janotti, C.G. Van de Walle, Phys. Rev. B 83, 035116 (2011).
  • Hydrogen donors in SnO2 studied by infrared spectroscopy and first-principles calculations,W.M.H. Oo, S. Tabatabaei, M.D. McCluskey, J.B. Varley, A. Janotti, C.G. Van de Walle, Phys. Rev. B 82, 193201 (2010).
  • Oxygen vacancies and donor impurities in β-Ga2O3, J.B. Varley, J.R. Weber, A. Janotti, C.G. Van de Walle, Appl. Phys. Lett. 97, 142106 (2010).
  • Group-V impurities in SnO​​2 from first-principles calculations, J.B. Varley, A. Janotti, C.G. Van de Walle, Phys. Rev. B 81, 245216 (2010).
  • Quantum computing with defects, J.R. Weber, W.F. Koehl, J.B. Varley, A. Janotti, B.B. Buckley, C.G. Van de Walle, D.D. Awschalom, Proc. Natl. Acad. Sci. 107, 19 (2010).
  • Hybrid functional studies of the oxygen vacancy in TiO2, A. Janotti, J.B. Varley, P. Rinke, N. Umezawa, G. Kresse, C.G. Van de Walle, Phys. Rev. B 81, 085212 (2010).
  • Hydrogen interactions with acceptor impurities in SnO2: First-principles calculations, J.B. Varley, A. Janotti, A.K. Singh, C.G. Van de Walle, Phys. Rev. B 79, 245206 (2009).