Research Output per Year
Research Output per Year
Overview
Personal Profile
Steve Johnston is a senior scientist on the Microscopy and Imaging team of the Materials Science center of NREL. He received his B.S. in Engineering from the Colorado School of Mines (CSM); M.S. from the University of Illinois, Urbana-Champaign, in Electrical Engineering; and Ph.D. from CSM in Materials Science. He worked for more than two years at Texas Instruments with clean-room semiconductor processing and measurement equipment. He has experience with NREL in minority-carrier lifetime, capacitance-related, and imaging-based measurement techniques for solar cell materials.
Research Interests
Microwave reflection photoconductive decay, transient free-carrier absorption, and time-resolved photoluminescence for minority-carrier lifetime and light-beam induced current for quantum efficiency and diffusion length measurements.
Electroluminescence imaging, photoluminescence imaging, and lock-in thermography for material and cell characterization.
Capacitance/voltage, admittance spectroscopy, and deep-level transient spectroscopy for characterization of carrier concentration and defect and impurity levels.
Education/Academic Qualification
PhD, Materials Science, Colorado School of Mines
Bachelor, Engineering, Colorado School of Mines
Master, Electrical Engineering, University of Illinois at Urbana-Champaign
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Collaborations and Top Research Areas From the Past 5 Years
Recent external collaboration on country/territory level. Dive into details by clicking on the dots or
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Bifacial Photovoltaic Module Degradation Dynamics
Ovaitt, S., Kern, D., Jordan, D., Johnston, S., Palmiotti, E., Hacke, P. & Deline, C., 2024, National Renewable Energy Laboratory (NREL).Research output: NREL › Poster
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Crystalline Si Surface Passivation with Nafion for Bulk Defects Detection with Electron Paramagnetic Resonance
Chen, K., Johnston, S., Taylor, P. C., Mulder, D., Guthrey, H., Nemeth, W., Theingi, S., Page, M., Kaupa, M., Young, D., Agarwal, S. & Stradins, P., 2024, In: ACS Applied Materials and Interfaces. 16, 17, p. 22736-22746 11 p.Research output: Contribution to journal › Article › peer-review
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Development and Reliability of Screen-Printable Fire-Through Cu Paste for Passivated Contact Solar Cells
Mitra, S., Johnston, S., Guthrey, H., Hacke, P., Dharmadasa, R., Druffel, T., Elmer, K., Nambo, A., Williams, D., Upadhyaya, A., Upadhyaya, V., Rohatgi, A. & Stradins, P., 2024, National Renewable Energy Laboratory (NREL).Research output: NREL › Poster
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Elucidating the Role of InGaAs and InAlAs Buffers on Carrier Dynamics of Tensile-Strained Ge Double Heterostructures
Bhattacharya, S., Johnston, S., Bodnar, R. & Hudait, M., 2024, In: ACS Applied Electronic Materials. 6, 6, p. 4247-4256 10 p.Research output: Contribution to journal › Article › peer-review
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GeSn-on-GaAs with Photoconductive Carrier Lifetime >400 ns: Role of Substrate Orientation and Atomistic Simulation
Karthikeyan, S., Johnston, S., Gayakwad, D., Mahapatra, S., Bodnar, R., Zhao, J., Joshi, R. & Hudait, M., 2024, In: Nanoscale. 16, 14, p. 7225-7236 12 p.Research output: Contribution to journal › Article › peer-review
1 Scopus Citations