Overview
Personal Profile
Aaron Ptak joined NLR in 2001 and has since worked on the growth and characterization of various materials and devices, including dilute nitrides and dilute bismides, coincident-site lattice matched alloys, and other novel materials for photovoltaic applications. He currently leads an effort to drastically reduce the cost of high-efficiency III-V solar cells, focused on the use of hydride vapor phase epitaxy to enable the use of highly efficient III-V materials in one-sun and low-concentration applications. Ptak has authored or co-authored more than 125 papers and 2 book chapters, given more than 100 invited and contributed presentations, and been awarded 6 patents.
Research Interests
Growth kinetics
New materials
Low-cost III-V deposition techniques
Photovoltaic materials and devices.
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Collaborations and Top Research Areas From the Past 5 Years
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Growth of Semiconductor Materials by Hydride Vapor Phase Epitaxy Using an External Aluminum Chloride Generator
Metaferia, W. (Inventor), Schulte, K. (Inventor), Ptak, A. (Inventor) & Simon, J. (Inventor), 2026, National Laboratory of the Rockies (NLR), Patent No. 12,540,417 B2, 3 Feb 2026Research output: Patent
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A Path to III-V Photovoltaic Cost Reduction Combining GaAs (211) Spalling with Halide Vapor Phase Epitaxy
Schulte, K., Dumont, M., Braun, A., Yoo, N., Packard, C., Simon, J. & Ptak, A., 2025, 20 p.Research output: NLR › Presentation
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Epitaxial Alkali Halide Layers for III-V Substrate Recycling
May, B. (Inventor), Young, D. (Inventor) & Ptak, A. (Inventor), 2025, National Laboratory of the Rockies (NLR), Patent No. 12,198,924 B2, 14 Jan 2025Research output: Patent
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Halide Vapor Phase Epitaxy of Ge from an Elemental Source
da Costa, E., Goh, M., Schulte, K., Young, M., Simon, J. & Ptak, A., 2025, In: Crystal Growth and Design. 25, 5, p. 1526-1532 7 p.Research output: Contribution to journal › Article › peer-review
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24% Single-Junction GaAs Solar Cell Grown Directly on Growth-Planarized Facets Using Hydride Vapor Phase Epitaxy: Article No. 2302035
Braun, A., Boyer, J., Schulte, K., McMahon, W., Simon, J., Perna, A., Packard, C. & Ptak, A., 2024, In: Advanced Energy Materials. 14, 3, 9 p.Research output: Contribution to journal › Article › peer-review
13 Scopus Citations