Ashwin C. Atre
Ph. D. Candidate
Materials Science & Engineering
B.S.E., Chemical Engineering, Princeton University (2009)
I am investigating the process of upconversion as a method for reducing transmission losses in photovoltaics and photocatalysts. By combining the energy contained in two low-energy photons and emitting a higher-energy photon, upconversion has great potential for improving solar cell efficiencies. I am currently focusing on a bimolecular upconverter system that, when combined with a carefully designed plasmonic nanoparticle system, will operate efficiently with low power non-coherent solar illumination.
I am also exploring plasmonic nanoparticle-based metamaterials that display interesting optical properties, such as a negative refractive index, not possible with materials found in nature.
A. Atre and J. Dionne, "Realistic upconverter-enhanced solar cells with non-ideal absorption and recombination efficiencies," Journal of Applied Physics, 110, 034505 (2011)
A. Atre, A. Garcia, H. Alaeian, and J. Dionne, "Towards hght-efficiency solar upconversion wih plasmonic nanostructures," invited article, Journal of Optics, "Green Photonics" Issue, 14, 024008 (2012)
H. Alaeian, A. Atre, and J. Dionne, "Optimized light absorption in Si wire array solar cells," invited article, Journal of Optics, "Green Photonics" Issue, 14, 024006 (2012)
J. Briggs, A. Atre, and J. Dionne, "Narrow-bandwidth solar upconversion: design principles, efficiency limits, and case studies," Journal of Applied Physics, 113, 124509 (2013)
A. Atre*, A. Garcia-Etxarri*, H.Alaeian, and J. Dionne, "A broadband negative index metamaterial at optical frequencies," Advanced Optical Materials, 1, 4 (2013)
J. Briggs, D. Wu, A. Atre, A. Garcia-Etxarri, and J. Dionne, "Upconversion for enhanced photovoltaics," Physics of Sustainable Energy III: Using Energy Efficiently and Producing it Renewably, Americal Institute of Physics (2015)
D. Schoen, A. Atre, A. Garcia-Etxarri, J. Dionne, and M. Brongersma, "Probing Complex Reflectivity in One Dimensional Surface Plasmon Polariton Wavesguides and Cavities Using STEM EELS," Nano Letters 15, 120 (2015)
A. Atre, B. Brennt, T. Coenen, A. Garcia-Etxarri, A. Polman, and J. Dionne, "Nanoscale optical tomography with cathodoluminescence spectroscopy," Nature Nanotechnology (2015)