Willis, S. M., “To the Moon, Strategic Competition in the Cislunar Region.” Aether, Special Edition, 17-30, (Winter 2023).
Willis, S. M., Rizzuto, A. P., Ben-Itzhak, S. “US and European Energy Security amid Great-Power Competition.” Journal of Indo-Pacific Affairs, Vol 6, No 5, 13-26, (July-August 2023).
Willis, S. M., Cheng, C., Assender, H. E., and Watt, A. A. R. “The Transitional Heterojunction Behavior of PbS/ZnO Colloidal Quantum Dot Solar Cells.” Nano Letters, 12, 1522-1526, (2012).
Willis, S. M., Dimmock, J. A. R., Tutu, F. K., Liu, H. Y., Peinado, M. G., Assender, H. E., Watt, A. A. R., Sellars, I. R. “Defect mediated extraction in InAs/GaAs quantum dot solar cells.” Solar Energy Materials and Solar Cells, Vol 102, 142-147 (2012).
Tutu, F. K., Sellers, I. R., Peinado, M. G., Pastore, C. E., Willis, S. M., Watt, A. R., Wang, T., and Liu, H. Y. “Improved performance of multilayer InAs/GaAs quantum-dot solar cells using a high-growth-temperature GaAs spacer layer.” Journal of Applied Physics, 111, 046101 (2012).
Kovacik, P., Willis, S. M., Matichak, J. D., Assender, H. E., Watt, A. A. R. “Effect of side groups on the vacuum thermal evaporation of polythiophenes for organic electronics.” Organic Electronics, vol 13, Issue 4, 687-696 (2012).
Kovacik, P., Sforazzini, G., Cook, A. G., Willis, S. M., Grant, P. S., Assender, H. E., Watt, A. A. R. “Vacuum-Deposited Planar Heterojunction Polymer Solar Cells.” Applied Materials & Interfaces, Vol 3, No 1, 11-15 (2011).
Russell, T. H., Willis, S. M., Crookston, M. B., and Roh, W. B. “Stimulated Raman Scattering in Multi-Mode Fibers and its Application to Beam Cleanup and Combining.” Journal of Nonlinear Optical Physics & Materials, Vol 11, No 3, 303-316, (2002).
Willis, S., Gandy, R., and Shimoyama, H. “Levitation of Fluorescent Polymer Microspheres in a DC Argon Plasma.” IEEE Transactions on Plasma Science, Vol 30, No 1, 86-87 (2002).
Gandy, R., Willis, S., and Shimoyama, H., “Initial experiments in the Idaho Dusty Plasma Device.” Physics of Plasmas, Vol 8, Number 5, 1746-1750 (2001).
Conference Presentations:
Willis, S. M., Sellers, I. R., Cheng, C., Liu, H. Y., Assender, H. E., Watt, A. R. R., “Electrical Characterisation of Quantum Dot Solar Cells,” presented at the Photovoltaic Science Applications and Technology (PVSAT-7) Conference, Heriot-Watt University, Edinburgh, United Kingdom, April 6-8, 2011.
Cheng, C. Willis, S. M., Walton, T., Cattley, C. A., Assender, H. E., Watt, A. R. R., “Lead Sulfide Nanocrystals for Photovoltaic Applications,” poster presentation at the Photovoltaic Science Applications and Technology (PVSAT-7) Conference, Heriot-Watt University, Edinburgh, United Kingdom, April 6-8, 2011.
Willis, S. M., Assender, H. E., Watt, A. R. R. “Polymer/Fullerene Solar Cell Interfaces Studied with Capacitance,” poster presentation at the Dechema First International Conference on Materials for Energy, Karlsruhe, Germany, July 4-8, 2010.
Willis, S. M., Assender, H. E., Watt, A. R. R. “Polymer/Fullerene Solar Cell Interfaces Studied with Impedance Spectroscopy,” poster presentation at the Photovoltaic Science Applications and Technology (PVSAT-6) Conference, University of Southampton, United Kingdom, March 24-26, 2010.
Willis, S. M., Roh, W.B. “Beam phasing properties of optical fiber as phase conjugate mirror,” presented at the 16th Annual Meeting of the IEEE Lasers and Electro-Optics Society, 2003. LEOS 2003, Tucson, AZ, October 27-28, 2003.
Thesis:
Willis, S. M. “Advanced Optoelectronic Characterisation of Solar Cells.” DPhil Thesis, University of Oxford, Oxford, United Kingdom (2011).
Willis, S. M. “Phasing a Dual Optical Path System Using an Optical Fiber as a Phase Conjugate Mirror.” M.S. Thesis, Air Force Institute of Technology, Wright-Patterson Air force Base, Ohio (2003).