Faculty Profiles

Colleges and Departments
Portrait of Dr. Wilhelmus Geerts

Dr. Wilhelmus Geerts

  • Professor at Physics, College of Science & Engineering

Grants

2026

  • Tate, Jitendra S (Principal), Geerts, Wilhelmus J (Co-Principal). Rare-earth-free Magnets via Field Assisted 3D Printing, BobCatalyst Proof of Concept Award, Materials Application Research Center TXST University, Texas State University, $29650. (Funded: January 2026 - December 2026). Grant.

2024

  • Haque, Ariful, Droopad, Ravindranath, Holtz, Mark W, Piner, Edwin L, Geerts, Wilhelmus J, Chen, Yihong, Hudnall, Todd W, Wistey, Mark A, Miyahara, Yoichi, Smith, Casey Eben, Mahato, Dip Narayan, Rastogi, Shiva Kumar, Kim, Namwon. Acquisition of a state-of-the-art Photoluminescence Spectrometer for Materials Characterization in Research and Education, Department of Defense, Federal, $434519. (Submitted: September 2023, Funded: 2024 - 2025). Grant.
  • Miyahara, Yoichi (Principal), Satchell, Nathan David (Co-Principal), Holtz, Mark W (Co-Principal), Kim, Namwon (Co-Principal), Martin, Benjamin (Co-Principal), Chen, Yihong (Supporting), Theodoropoulou, Nikoleta (Supporting), Geerts, Wilhelmus J (Supporting), Piner, Edwin L (Supporting), Haque, Ariful (Supporting), Droopad, Ravindranath (Supporting), Mahato, Dip Narayan (Supporting), Smith, Casey Eben (Supporting). MRI: Track 1 Acquisition of state-of-the-art lithography system for micro/nanometer scale device fabrication in research and education, National Science Foundation, Federal, $569780. (Submitted: November 14, 2023, Funded: September 1, 2024 - August 31, 2027). Grant.
  • Geerts, Wilhelmus J (Principal), Scolfaro, Luisa M (Co-Principal). Study of Migration and Diffusion in Hybrid Halide Perovskites Solar Cell Devices: effect on Stability and Efficiency., Research Enhancement, Texas State University, $15995. (Funded: January 1, 2024 - May 30, 2025). Grant.

2022

  • Geerts, Wilhelmus J (Principal), Percent Contribution: %40, Tate, Jitendra S (Co-Principal), Percent Contribution: %25, Chen, Yihong (Co-Principal), Percent Contribution: %25, Droopad, Ravindranath (Other), Percent Contribution: %5, Rhodes, Christopher Peter (Other), Percent Contribution: %5. MRI: Development of triaxial Vibrating Sample Magnetometry for Research and Education, NSF, Federal, $119461. (Submitted: January 19, 2022, Funded: September 2022 - August 30, 2025). Grant.
  • Chen, Yihong (Principal), Percent Contribution: %40, Droopad, Ravindranath (Co-Principal), Percent Contribution: %15, Stern, Harold P, Percent Contribution: %9, Stephan, Karl, Percent Contribution: %9, Tate, Jitendra S, Percent Contribution: %9, Geerts, Wilhelmus J, Percent Contribution: %9, Shi, Xijun, Percent Contribution: %9. Acquisition of Wide Frequency Band Characterization System for Electronic Devices, Antennas, and Intelligent Materials, DOD, Federal, $548700. (Submitted: August 16, 2021, Funded: August 1, 2022 - June 30, 2024). Grant.
  • Geerts, Wilhelmus J. Developmental Leave spring 2022, Senate Developmental Leave Program, Texas State University. (Submitted: October 2019, Funded: January 2022 - May 2022). Grant.

2021

  • Theodoropoulou, Nikoleta (Principal), Percent Contribution: %40, Geerts, Wilhelmus J (Co-Principal), Percent Contribution: %10, Myers, Thomas H (Co-Principal), Percent Contribution: %10, Rhodes, Christopher Peter (Co-Principal), Percent Contribution: %10, Zakhidov, Alexander (Co-Principal), Percent Contribution: %10, Tate, Jitendra S (Co-Principal), Percent Contribution: %10, Miyahara, Yoichi (Co-Principal), Percent Contribution: %10. Enhanced Optical, Electrical, and Magnetic Measurement capabilities for Materials and Device Studies in Research and Education, Department of Defense, Federal, $278778. (Submitted: August 28, 2020, Funded: May 10, 2021 - May 9, 2023). Grant.
  • Geerts, Wilhelmus J, Percent Contribution: %34, Tate, Jitendra S, Percent Contribution: %33, Chen, Yihong, Percent Contribution: %33. Materials with Intelligence: Magnetic Field Assisted Additive Manufacturing, Texas State University, $16000. (Funded: January 11, 2021 - May 31, 2022). Grant.

2020

  • Droopad, Ravindranath (Principal), Percent Contribution: %34, Geerts, Wilhelmus J (Co-Principal), Percent Contribution: %33, Scolfaro, Luisa M (Co-Principal), Percent Contribution: %33. Ultrawide Bandgap Heterostructures: Growth, Characterization and Modeling, Federal, $656949. (Submitted: July 2019, Funded: July 31, 2020 - July 30, 2023). Grant.

2019

  • Komogortsev, Oleg, Griffith, Henry Keith, Geerts, Wilhelmus J. iSTATE: An Augmented Reality Platform Technology for Eye Tracking-Based Human State Assessment, Texas State University, Texas State University, $10000. (Funded: April 1, 2019 - March 31, 2020). Grant.
  • Geerts, Wilhelmus J (Principal). High-Bandgap Hybrid Perovskites for Efficient Underwater Solar Cells, ONR, Federal, $433914. (Funded: July 1, 2019 - December 31, 2023). Grant.
  • Geerts, Wilhelmus J. Collaborative Research: Levering a Solvent Toolkit for Doping and Characterizing Hybrid Perovskite Solar Cells, NSF, Federal, $200512. (Funded: May 2019 - December 31, 2023). Grant.
  • Geerts, Wilhelmus J, Scolfaro, Luisa M. URAP/HSAP -2019 request in support of Optical and Electrical Characterization of NiFe-oxide thin films Research, Office of the Army, Federal, $7500. (Submitted: November 2018, Funded: May 2019 - August 2019). Grant.

2018

  • Geerts, Wilhelmus J, Scolfaro, Luisa M. URAP/HSAP-2018 request in support of Optical and Electrical Characterization of NiFe-oside thin films research, Army Research Office, Federal, $7500. (Submitted: November 2017, Funded: June 2018 - August 2018). Grant.

2017

  • Holtz, Mark W (Principal), Percent Contribution: %15, Chen, Yihong (Supporting), Percent Contribution: %11, Geerts, Wilhelmus J (Supporting), Percent Contribution: %15, Droopad, Ravindranath (Supporting), Percent Contribution: %8, Li, Jian (Co-Principal), Percent Contribution: %5, Myers, Thomas H (Supporting), Percent Contribution: %8, Piner, Edwin L (Supporting), Percent Contribution: %8, Theodoropoulou, Nikoleta (Supporting), Percent Contribution: %15, Zakhidov, Alexander (Supporting), Percent Contribution: %15. System of Integrated Characterization of Electronic Devices and Materials, U.S. AFOSR, Federal, $332086. (Funded: August 15, 2017 - August 14, 2018). Grant.
  • Geerts, Wilhelmus J (Principal), Percent Contribution: %40, Chen, Yihong (Co-Principal), Percent Contribution: %10, Droopad, Ravindranath (Co-Principal), Percent Contribution: %10, Rhodes, Christopher Peter (Co-Principal), Percent Contribution: %10, Theodoropoulou, Nikoleta (Co-Principal), Percent Contribution: %10, Spencer, Gregory F (Other), Percent Contribution: %5, Tate, Jitendra S (Co-Principal), Percent Contribution: %10, Smith, Casey Eben (Supporting), Percent Contribution: %5. MRI: Acquisition of Vibrating Sample Magnetometer for Materials Research and Education, NSF-MRI, Federal, $225330. (Funded: September 1, 2017 - August 30, 2021). Grant.
  • Geerts, Wilhelmus J, Scolfaro, Luisa. URAP/HSAP-2017 request in support of Optical and Electrical Characterization of NiFe-oside thin films research, Army Research Office, Federal, $6000. (Funded: June 1, 2017 - August 20, 2017). Grant.

2016

  • Zakhidov, Alexander (Principal), Percent Contribution: %40, Holtz, Mark W (Supporting), Percent Contribution: %15, Piner, Edwin L (Supporting), Percent Contribution: %5, Myers, Thomas H (Supporting), Percent Contribution: %5, Theodoropoulou, Nikoleta (Supporting), Percent Contribution: %5, Beall, Gary W (Supporting), Percent Contribution: %5, Yu, Qingkai (Supporting), Percent Contribution: %5, Rhodes, Christopher Peter (Supporting), Percent Contribution: %5, Geerts, Wilhelmus J (Supporting), Percent Contribution: %5, Betancourt, Tania (Supporting), Percent Contribution: %5, Li, Jian (Supporting), Percent Contribution: %5. Scanning Probe Microscope for Materials Research and Education, U. S. Army, Federal, $358558. (Funded: July 1, 2016 - June 30, 2017). Grant.
  • Zollner, Stefan (Principal), Geerts, Wilhelmus J (Supporting). Acquisition of a Fourier- Transform Infrared Ellipsometer with Cryostat for Research and Education, Army Office, Federal. (Funded: June 2016 - June 2017). Grant.
  • Geerts, Wilhelmus J, Scolfaro, Luisa. 2016 HSAP/URAP extension for Electric and Optical Properties of NiFe-oxide thin films, Army Research Office, Federal, $6000. (Funded: June 1, 2016 - August 20, 2016). Grant.

2015

  • Geerts, Wilhelmus J (Principal), Scolfaro, Luisa (Co-Principal). Optical and Electrical Properties of NiFe-oxide Thin Films, Army Research Office, Federal, $387691. (Funded: September 2015 - August 2019). Grant.
  • Geerts, Wilhelmus J (Principal), Scolfaro, Luisa (Co-Principal). Optical and Electrical Properties of Permalloy Oxide, research enhancement program Texas State University, Texas State University, $13443. (Funded: January 2015 - May 2016). Grant.

2014

  • Geerts, Wilhelmus J (Principal), Donnelly, Dave (Principal). Computers for PHYS 1430 and PHYS 2425 teaching labs, ACC computer grant, Texas State University, $18640. (Submitted: June 1, 2014, Funded: June 2, 2014 - December 30, 2014). Grant.

2013

  • Geerts, Wilhelmus (Principal), Visnawathan, Vishu (Co-Principal), Tamir, Dan (Co-Principal). DMD based Light Pattern Illuminator for Topography Monitor, Texas Instruments, Texas Instruments, $599. (Submitted: January 1, 2013, Funded: January 1, 2013 - December 31, 2013). Grant.
  • Geerts, Wilhelmus (Principal), Viswanathan, Vishu (Co-Principal), Tamir, Dan (Co-Principal). DMD based scanning Magneto-Optical Kerr Microscope for studies of the magneto-plastic properties of thin ferromagnetic films, Texas Instruments, Texas Instruments, $599. (Submitted: 2013, Funded: January 1, 2013 - December 31, 2013). Grant.

2012

  • Geerts, Wilhelmus (Principal). Computational tools in support of the undergraduate and graduate physics programs, Texas State University and Dr. Milton Nielsen, Institutional (Higher Ed), $7000. (Submitted: January 1, 2012, Funded: January 1, 2012 - December 31, 2012). Grant.

2010

  • Geerts, Wilhelmus (Co-Principal), Irvin, Jennifer (Principal), Lee, Byounghak (Co-Principal). Chemistry and Physics of n-Doping Electroactive Polymers: Computationally Directed Synthesis for Improved Performance, Research Corporation, Private / Foundation / Corporate, $100000. (Submitted: 2010, Funded: January 1, 2010 - January 1, 2013). Grant.
  • Geerts, Wilhelmus (Principal), Percent Contribution: %55, Tamir, Dan (Co-Principal), Percent Contribution: %40, Pandey, Kumar (Co-Principal), Percent Contribution: %5. MRI: Development of a Complex Topography Photolithography Tool for Micro-Patterning on Non-Flat Substrates, National Science Foundation-MRI, Federal, $99263. (Submitted: 2010, Funded: January 1, 2010 - January 1, 2013). Grant.

2008

  • Geerts, Wilhelmus (Co-Principal), Tamir, Dan (Principal). Laser Beam Shaping using Imaging Techniques, Research Enhancement program Texas State, Research Enhancement Program Texas State, $16000. (Submitted: 2008, Funded: January 1, 2008 - December 31, 2008). Grant.

2007

  • Geerts, Wilhelmus (Principal), Tamir, Dan (Co-Principal). Lehman internship Daniel Palmer, Dean College of Science, Texas State University. (Submitted: June 1, 2007, Funded: June 1, 2007 - August 31, 2007). Grant.
  • Ventrice, Carl (Co-Principal), Percent Contribution: %100, Geerts, Wilhelmus (Principal), Percent Contribution: %100. Upgrade of the Heat-Optics-Modern Physics Teaching Lab, ACC computer replacement program Texas State, Other, $17259. (Submitted: January 1, 2007, Funded: January 1, 2007 - December 31, 2007). Grant.

2006

  • Geerts, Wilhelmus (Principal), Sablik, Martin (Co-Principal). Inter-American Materials Collaboration: Modeling and Testing the Effects of Texture and Plastic Deformation on the Magnetic Properties of Polycrystalline Ferromagnetic Materials, National Science Foundation, Federal, $28000. (Submitted: August 1, 2006, Funded: August 1, 2006 - August 1, 2007). Grant.
  • Geerts, Wilhelmus (Co-Principal), Donnelly, David (Co-Principal), Lee, Jack (Co-Principal). Effects of Athermal Annealing on High-k Gate stacked MosCAPs and MosFets, The Texas Higher Education Coordinating Board - ARP, State, $100000. (Submitted: 2006, Funded: January 1, 2006 - January 1, 2007). Grant.
  • Spencer, Greg (Principal), Percent Contribution: %100, Geerts, Wilhelmus (Co-Principal). Expansion of Physics Computer Simulation Laboratory., ACC computer replacement program Texas State University, Other. (Submitted: 2006, Funded: January 1, 2006 - December 31, 2006). Grant.

2005

  • Geerts, Wilhelmus (Principal). Unidirectional Doping of Silicon Particles for Solar Cells., Research Enhancement Program Texas State University, Texas State Enhancement Program, $7400. (Submitted: 2005, Funded: January 1, 2005 - August 31, 2006). Grant.
  • Geerts, Wilhelmus (Principal). A Deep Level Transient Spectroscopy Setup for the characterization of Semiconductor Materials and Devices., line-item budget Gene Stouder, State, $29910. (Submitted: January 1, 2005, Funded: January 1, 2005 - December 31, 2005). Grant.
  • Geerts, Wilhelmus (Principal). Calibration Sources and Remote Input Coupler for CV setup., Line-item budget Gene Stouder, State, $6325. (Submitted: 2005, Funded: January 1, 2005 - December 31, 2005). Grant.
  • Geerts, Wilhelmus (Principal). Device and Process Simulator for Semiconductor education and research., Line-item budget Gene Stouder, State, $14000. (Submitted: 2005, Funded: January 1, 2005 - December 31, 2005). Grant.
  • Geerts, Wilhelmus (Principal). Hall card, switching unit, nanovoltmeter, and current source for Van der Pauw electric transport measurement., Line-item budget Gene Stouder, State, $13142. (Submitted: 2005, Funded: January 1, 2005 - December 31, 2005). Grant.
  • Geerts, Wilhelmus (Principal). Workstations for the Electronics Teaching Lab., ACC computer replacement program Texas State University., Other, $19500. (Submitted: January 1, 2005, Funded: January 1, 2005 - December 31, 2005). Grant.

2004

  • Geerts, Wilhelmus (Principal). Solar simulator equipment proposal, Department of Energy (DOE) ERLE Program, Federal, $10000. (Submitted: 2004, Funded: January 1, 2004 - January 1, 2005). Grant.
  • Geerts, Wilhelmus (Principal). Delsa Particle Analyzer, DOE, Erle program, Federal, $10000. (Submitted: 2004, Funded: January 1, 2004 - December 31, 2004). Grant.

2003

  • Geerts, Wilhelmus (Principal), Lodder, Cock (Co-Principal), Abelmann, Leon (Co-Principal). Microscopic analysis of magneto-resistive sensors for probe recording, Stichting Technische Wetenschappen, Dutch NSF, STW: Dutch NSF, $7687. (Submitted: May 1, 2003, Funded: June 1, 2003 - August 31, 2003). Grant.

2002

  • Galloway, Heather (Principal), Geerts, Wilhelmus (Co-Principal). Effects of Chemical Mechanical Planarization on Electrical Properties of Low-k Materials, THECB-ARP, State, $130000. (Submitted: September 1, 2001, Funded: January 1, 2002 - December 31, 2002). Grant.

2001

  • Geerts, Wilhelmus (Principal), Donehew, Brian (Co-Principal). Travel and Lodging grant NHMFL: MO measurements at low temperature and high magnetic fields, INational High Magnetic Field Laboratory, National High Magnetic Field Laboratory, $2160. (Submitted: June 1, 2001, Funded: June 1, 2001 - August 31, 2001). Grant.

2000

  • Geerts, Wilhelmus (Co-Principal), Percent Contribution: %33, Galloway, Heather (Principal), Percent Contribution: %33, Gutierrez, Carlos (Co-Principal), Percent Contribution: %33. Creation of an Applied Master's Degree Program in Materials Physics, NSF-DMR, Federal, $352000. (Submitted: 2000, Funded: January 1, 2000 - December 31, 2003). Grant.
  • Geerts, Wilhelmus (Principal), SMISD (Principal). Smaller Learning and Communities Grant, Department of Education, Federal, $48000. (Submitted: 2000, Funded: January 1, 2000 - December 31, 2003). Grant.
  • Geerts, Wilhelmus (Principal). Influence of Stress on Magnetic Sub-micron Structures., Research Enhancement program Texas State University, $8000. (Submitted: 2000, Funded: January 1, 2000 - December 31, 2000). Grant.

1999

  • Geerts, Wilhelmus (Principal). The Elasto-Magneto-Optical Properties of Nickel and NiFe Alloys, Research Corporation, Private / Foundation / Corporate, $37878. (Submitted: April 1, 1999, Funded: January 1, 1999 - December 31, 2003). Grant.
  • Geerts, Wilhelmus (Principal). Construction of an Ellipsometer suitable for Magneto-Optical Spectroscopy., Research Enhancement Program Texas State University., Other, $8000. (Submitted: 1999, Funded: January 1, 1999 - December 31, 1999). Grant.

1998

  • Geerts, Wilhelmus (Principal). NHMFL travel and lodging grant: MO measurements in high field and at low temperatures, National High Magnetic Field Laboratory, National High Magnetic Field Laboratory. (Submitted: June 1, 1998, Funded: January 6, 1998 - August 31, 1998). Grant.
  • Geerts, Wilhelmus (Principal). Development of an Electronic Homework Web site for PHYS1410., Merrick Instructional Enhancement Grant Texas State University., Institutional (Higher Ed), $2000. (Submitted: 1998, Funded: January 1, 1998 - December 31, 1998). Grant.
  • Geerts, Wilhelmus (Principal). Ellipsometry and Kerr Spectroscopy., College of Science Texas State University, Other, $4000. (Submitted: 1998, Funded: January 1, 1998 - December 31, 1998). Grant.