TY - RPRT TI - 15.3% AM1.5G Efficiency GaAs Solar Cells Fabricated via an Epitaxy-Free Process AU - Jahelka, Phillip R. [California Institute of Technology (CalTech), Pasadena, CA (United States)] (ORCID:0000000214607933) AU - Ptak, Aaron J. [National Laboratory of the Rockies (NLR), Golden, CO (United States)] (ORCID:0000000309978964) AU - Simon, John [National Laboratory of the Rockies (NLR), Golden, CO (United States)] (ORCID:0000000329873641) AU - Schulte, Kevin L. [National Laboratory of the Rockies (NLR), Golden, CO (United States)] (ORCID:0000000342736254) AU - Kiessling, Frank M. [Leibniz Inst. for Crystal Growth (IKZ), Berlin (Germany)] (ORCID:0000000176652214) AU - Frank-Rotsch, Christiane [Leibniz Inst. for Crystal Growth (IKZ), Berlin (Germany)] (ORCID:0000000185901403) AU - Torres-Londono, Susana [California Institute of Technology (CalTech), Pasadena, CA (United States)] (ORCID:0009000677975027) AU - Atwater, Harry A. [California Institute of Technology (CalTech), Pasadena, CA (United States)] (ORCID:0000000194350201) PY - 2026 DO - 10.1109/jphotov.2026.3702679 UR - https://www.osti.gov/biblio/3378275 ID - 3378275 ER -