Environmental & Energy Justice
A pillar of my research is to evaluate the distributional justice aspects of clean technologies deployment –such as solar PV and electric vehicles–, and elucidate areas for effective policy interventions.
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Disparities in rooftop photovoltaics deployment in the United States by race and ethnicity
D. Sunter, S Castellanos*, D.M. Kammen Nature Sustainability 2, 71-76 (2019) Mapping opportunities for vehicle electrification to address environmental justice challenges in Mexico City J.A. Mahady, C. Octaviano, O.S. Araiza Bolaños, E. Rosas López, D.M. Kammen, S. Castellanos* Environmental Science and Technology (2020), https://doi.org/10.1021/acs.est.9b06148 |
Sustainable Transportation
I am excited about collaborating with government stakeholders and industry partners to leverage big data and both analyze and develop decision tools for urban sustainable transportation solutions
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Rethinking urban transportation systems with big data analysis to fight climate change
S Castellanos*, A. Gao, P. Sánchez, C. Octaviano, A. Jain, A. Contreras-Ruiz, O.S. Araiza Bolaños, H. Rincón, A. Xu, F. Ramírez, A. Martínez, D.M. Kammen In Progress Mapping opportunities for vehicle electrification to address environmental justice challenges in Mexico City J.A. Mahady, C. Octaviano, O.S. Araiza Bolaños, E. Rosas López, D.M. Kammen, S. Castellanos* Environmental Science and Technology (2020), https://doi.org/10.1021/acs.est.9b06148 Transportation connectivity and air quality: a case for public transport electrification in Oakland, California S. Castellanos*, C. Qiu, A. Ku, D.M. Kammen In Progress Assessing the impact of electric vehicles growth in Mexico's electrical grid planning S. Castellanos*, A Jain, D.M. Kammen In Progress |
Renewable Energy Technology Manufacturing & Deployment
I am interested in the coupling effects of clean energy manufacturing, deployment, and assessment through data-driven approaches, and solutions to their effective scaling found at the policy/technical/economic intersection.
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Design of domestic photovoltaics manufacturing systems under global constraints and uncertainty
JE Santibañez-Aguilar, S. Castellanos*, A. Flores-Tlacuahuac, BB Shapiro, DM Powell, T. Buonassisi, D.M. Kammen Renewable Energy 148, 1174–1189 (2020) Sustainable silicon photovoltaics manufacturing in a global market: A techno-economic, tariff and transportation framework S. Castellanos*, JE Santibañez-Aguilar, BB Shapiro, DM Powell, IM Peters, T. Buonassisi, D.M. Kammen, A. Flores-Tlacuahuac Applied Energy 212, 704-719 (2018) Rooftop solar photovoltaic potential in cities: how scalable are assessment approaches? S. Castellanos*, D. Sunter, DM Kammen Environmental Research Letters 12 (12), 125005 (2017) Political affiliation and rooftop solar adoption in New York and Texas D. Sunter, J. Dees, S. Castellanos, D. Callaway, D.M. Kammen IEEE Photovoltaics Specialist Conference, Waikoloa, HI (2018) |
Energy Systems Modeling
I am developing and adapting a capacity expansion model to Mexico called SWITCH to assess optimal least-cost investments in generation and transmission assets to reach national renewable energy penetration mandates, and decarbonization paths.
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Modeling high penetration of solar PV and renewables in the grid: A case for Mexico
S. Castellanos, A. Pasos-Trejo, P. Sanchez-Perez, M. Torres, A. Monroy-Tellez, J. Johnston, A. Jain, F. James-Langer, D. Ponce de Leon, D.M. Kammen, IEEE Photovoltaics Specialist Conference, Waikoloa, HI (2018) Impacts and savings of energy efficiency measures: A case for Mexico's electrical grid E. Ramirez-Sánchez, G. Evangelista-Palma, D. Gutierrez-Navarro, D.M. Kammen, S. Castellanos* (In Review) |
Previous research on Solar Photovoltaics
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Ph.D. My Ph.D. research focused on the electrical impact of line defects ('dislocations') in silicon material used for solar cells, and ways to accelerate their electrical characterization process. I proposed and validated an optical inspection process based on dislocations' surface characteristics, which helps predict the detrimental recombination activity of that defect in the electrical performance of a solar cell. I extended this methodology to novel silicon growth processes, and proposed a spatial dispersion metric to estimate the relative electrical recombination activity of dislocation clusters in silicon. This work aims at providing a tool for crystal growers and solar cell manufacturers to evaluate the electrical performance of defects in solar cells, rapidly and early on in the solar cell processing stage. In turn, this could enable them to reduce not only costs, but also the learning cycles times associated with improving crystal growth processes. M.Sc.
Through my M.Sc. work I explored a method to quantify residual stress in various silicon wafers grown from different methods and used for solar cell applications. I accomplished this through the use of an infrared birefringence imaging technique that is based on converting light-matter interactions into an understanding of a material's lattice straining. Key elements of this research were visualizing and quantifying residual stress given its strong impact on manufacturing yield, and therefore, module cost.  Infrared birefringence imaging (IBI) method used to analyze residual stress patterns in various solar cell materials.
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Graduate Studies Publications Characterization of high-quality kerfless epitaxial silicon for solar cells: Defect sources and impact on minority-carrier lifetime MM Kivambe, DM Powell, S Castellanos, MA Jensen, AE Morishige, B Lai, ... Journal of Crystal Growth 483, 57-642018 An insight into dislocation density reduction in multicrystalline silicon S Woo, M Bertoni, K Choi, S Nam, S Castellanos, DM Powell, ... Solar Energy Materials and Solar Cells 155, 88-10072016 Exceeding 3 ms Minority Carrier Lifetime in n–type Non-contact Crucible Silicon S Castellanos*, M Kivambe, MA Jensen, DM Powell, K Nakajima, ... Energy Procedia 92, 779-78432016 High-Performance and Traditional Multicrystalline Silicon: Comparing Gettering Responses and Lifetime-Limiting Defects S Castellanos*, KE Ekstrøm, A Autruffe, MA Jensen, AE Morishige, ... IEEE Journal of Photovoltaics 6 (3), 632-640172016 Exceptional gettering response of epitaxially grown kerfless silicon DM Powell, VP Markevich, J Hofstetter, MA Jensen, AE Morishige, ... Journal of Applied Physics 119 (6), 065101132016 Material requirements for the adoption of unconventional silicon crystal and wafer growth techniques for high‐efficiency solar cells J Hofstetter, C Cañizo, H Wagner, S Castellanos, T Buonassisi Progress in Photovoltaics: Research and Applications 24 (1), 122-132202016 Dislocation density reduction in multicrystalline silicon via cyclic annealing K Choi, S Castellanos, DM Powell, T Buonassisi, H Choi physica status solidi (a) 212 (10), 2315-232112015 Electrical impact assessment of dislocations in silicon materials for solar cells S Castellanos Massachusetts Institute of Technology2015 Dislocation density reduction limited by inclusions in kerfless high‐performance multicrystalline silicon S Castellanos*, T Buonassisi physica status solidi (RRL)-Rapid Research Letters 9 (9), 503-5062015 Minority-carrier lifetime and defect content of n-type silicon grown by the noncontact crucible method M Kivambe, DM Powell, S Castellanos, MA Jensen, AE Morishige, ... Journal of Crystal Growth 407, 31-36222014 Iron precipitation upon gettering in phosphorus-implanted Czochralski silicon and its impact on solar cell performance DP Fenning, V Vahanissi, J Hofstetter, AE Morishige, H Laine, ... Photovoltaic Specialist Conference (PVSC), 2014 IEEE 40th, 3641-36433*2014 Inferring dislocation recombination strength in multicrystalline silicon via etch pit geometry analysis
S Castellanos*, J Hofstetter, M Kivambe, M Rinio, B Lai, T Buonassisi Photovoltaic Specialist Conference (PVSC), 2014 IEEE 40th, 2957-29592014 Quantitative residual stress imaging of multicrystalline, quasi-mono, and thin kerfless silicon wafers by infrared birefringence and sectioning S Castellanos*, T Buonassisi Photovoltaic Specialist Conference (PVSC), 2014 IEEE 40th, 0973-09742014 Variation of dislocation etch-pit geometry: An indicator of bulk microstructure and recombination activity in multicrystalline silicon S Castellanos*, M Kivambe, J Hofstetter, M Rinio, B Lai, T Buonassisi Journal of Applied Physics 115 (18), 183511142014 The impact of dislocation structure on impurity decoration of dislocation clusters in multicrystalline silicon M Kivambe, G Stokkan, T Ervik, S Castellanos, J Hofstetter, T Buonassisi Solid State Phenomena 205, 71-76 Method to reduce dislocation density in silicon using stress T. Buonassisi, M.I. Bertoni, A. Argon, S. Castellanos, A. Fecych, D.M. Powell, M. Vogl, Massachusetts Institute of Technology, 2013. Method to reduce dislocation density in silicon using stress. U.S. Patent 8,389,999. Dislocation density reduction during impurity gettering in multicrystalline silicon H.J. Choi, M.I. Bertoni, J. Hofstetter, D.P. Fenning, D.M. Powell, S. Castellanos, T. Buonassisi, 2013. Dislocation density reduction during impurity gettering in multicrystalline silicon. IEEE Journal of Photovoltaics, 3(1), pp.189-198. Stress‐enhanced dislocation density reduction in multicrystalline silicon M.I. Bertoni, D.M. Powell, M. Vogl, S. Castellanos, A. Fecych, T. Buonassisi, 2011. Stress‐enhanced dislocation density reduction in multicrystalline silicon. physica status solidi (RRL)–Rapid Research Letters, 5(1), pp.28-30. Infrared birefringence imaging of residual stress and bulk defects in multicrystalline silicon V. Ganapati, S. Schoenfelder, S. Castellanos, S. Oener, R. Koepge, A. Sampson, M.A. Marcus, B. Lai, H. Morhenn, G. Hahn, J. Bagdahn, T. Buonassisi, 2010. Infrared birefringence imaging of residual stress and bulk defects in multicrystalline silicon. Journal of Applied Physics, 108(6), p.063528. Stress and temperature coupling effects on dislocation density reduction in multicrystalline silicon S. Castellanos*, M.I. Bertoni, M. Vogl, A. Fecych, T. Buonassisi, 2010, June. Stress and temperature coupling effects on dislocation density reduction in multicrystalline silicon. In Photovoltaic Specialists Conference (PVSC), 2010 35th IEEE (pp. 000357-000358). IEEE. |