Rafael Jaramillo

  • Assistant Professor of Materials Science and Engineering
  • Ph.D., Physics, The University of Chicago, 2008
  • M.Eng., Applied and Engineering Physics, Cornell University, 2003
  • B.S., Applied and Engineering Physics, Cornell University, 2002

Electronic Materials; Nanotechnology; Phase Transformations; Semiconductors; Surfaces, Interfaces, and Thin Films; Transport Phenomena

Rafael Jaramillo

Research

Our research sits in the big, fun space between materials science, solid state physics, and opto-electronic technologies. Our current projects fall into three categories:

1. Photoconductivity: Fundamental understanding, control through material processing, and utilization in device technology.

2. Layered and phase-change materials: Developing new materials processing methods and demonstrating new uses for layered chalcogenide materials.

3. Complex chalcognides and highly-polarizable semiconductors: Developing chalcogenide electronic materials in the perovskite and related complex, three-dimensional crystal structures.

For more information please see our group website.

Recent News

DMSE Faculty host summer undergraduate researchers

From simulating the physics of spinning magnetic particles to fabricating new materials for infrared chemical sensing, MIT Materials Research Laboratory summer researchers will challenge themselves to learn new skills and develop new scientific insights. A diverse group of top-performing…  

Broadening materials science outreach

Regional employers are coping with too few qualified candidates for materials science-related jobs, MIT Assistant Professor of Materials Science and Engineering …  

Jaramillo MITEI Profile

Professor Rafael Jaramillo was profiled in an MIT News article about new faculty who bring a wide array of energy interests and developments to the Institute. “I try to find where the connections are between the scope of…  

New faculty

Please welcome our newest faculty members: Juejun (JJ) Hu joined the faculty in the Department of Materials Science and Engineering in January 2015 as an assistant professor and as the Merton C. Flemings Career Development Professor of Materials Science and Engineering.…  

Publications

2020

S. M. Oliver et al., “Phonons and excitons in ZrSe2–ZrS2 alloys”, Journal of Materials Chemistry C, vol. 8, no. 17. Royal Society of Chemistry (RSC), pp. 5732-5743, 2020.
S. S. Jo et al., “Formation of large-area MoS2 thin films by oxygen-catalyzed sulfurization of Mo thin films”, Journal of Vacuum Science & Technology A, vol. 38, no. 1. American Vacuum Society, p. 013405, 2020.
Y. Li, Singh, A., Reidy, K., Jo, S. S., Ross, F. M., and Jaramillo, R., “Making Large‐Area Titanium Disulfide Films at Reduced Temperature by Balancing the Kinetics of Sulfurization and Roughening”, Advanced Functional Materials. Wiley, p. 2003617, 2020.

2019

S. Wilson, Altman, M., and Jaramillo, R., “Methods for Open and Reproducible Materials Science”, MIT Undergraduate Research Journal, vol. 38. pp. 44-50, 2019.
Y. Li et al., “Near-infrared photonic phase-change properties of transition metal ditellurides”, Low-Dimensional Materials and Devices 2019. SPIE, 2019.
A. Singh et al., “Near-infrared optical properties and proposed phase-change usefulness of transition metal disulfides”, Applied Physics Letters, vol. 115, no. 16. AIP Publishing, p. 161902, 2019.
H. Xu, Zhou, J., Li, Y., Jaramillo, R., and Li, J., “Optomechanical control of stacking patterns of h-BN bilayer”, Nano Research, vol. 12, no. 10. Springer Science and Business Media LLC, pp. 2634-2639, 2019.
K. Ye et al., “Tuning Electrical, Optical, and Thermal Properties through Cation Disorder in Cu2ZnSnS4”, Chemistry of Materials, vol. 31, no. 20. American Chemical Society (ACS), pp. 8402-8412, 2019.
S. Niu et al., “Crystal growth and structural analysis of perovskite chalcogenide BaZrS3 and Ruddlesden–Popper phase Ba3Zr2S7”, Journal of Materials Research, vol. 34, no. 22. Cambridge University Press (CUP), pp. 3819-3826, 2019.
R. Jaramillo and Ravichandran, J., “In praise and in search of highly-polarizable semiconductors: Technological promise and discovery strategies”, APL Materials, vol. 7, no. 10. AIP Publishing, p. 100902, 2019.

2018

S. A. Filippone, Sun, Y. -Y., and Jaramillo, R., “Determination of adsorption-controlled growth windows of chalcogenide perovskites”, MRS Communications, vol. 8. pp. 145-151, 2018.
S. Niu et al., “Optimal Bandgap in a 2D Ruddlesden–Popper Perovskite Chalcogenide for Single-Junction Solar Cells”, Chemistry of Materials, vol. 30. pp. 4882-4886, 2018.
J. Zhou, Xu, H., Li, Y., Jaramillo, R., and Li, J., “Opto-Mechanics Driven Fast Martensitic Transition in Two-Dimensional Materials”, Nano Letters, vol. 18. pp. 7794-7800, 2018.
H. Yin, Akey, A. J., and Jaramillo, R., “Large and persistent photoconductivity due to hole-hole correlation in CdS”, Physical Review Materials, vol. 2. p. 084602, 2018.
S. A. Filippone, Sun, Y. -Y., and Jaramillo, R., “The effect of an improved density functional on the thermodynamics and adsorption-controlled growth windows of chalcogenide perovskites”, MRS Advances, vol. 3. pp. 3249-3254, 2018.

2016

R. Jaramillo, Youssef, A., Akey, A. J., Schoofs, F., Ramanathan, S., and Buonassisi, T., “Using Atom-Probe Tomography to Understand ZnO:Al/SiO2/Si Schottky Diodes”, Physical Review Applied, vol. 6. p. 034016, 2016.
R. Jaramillo et al., “Erratum: “Transient terahertz photoconductivity measurements of minority-carrier lifetime in tin sulfide thin films: Advanced metrology for an early stage photovoltaic material” [J. Appl. Phys. 119, 035101 (2016)]”, Journal of Applied Physics, vol. 119. p. 249901, 2016.
R. Jaramillo et al., “Transient terahertz photoconductivity measurements of minority-carrier lifetime in tin sulfide thin films: Advanced metrology for an early stage photovoltaic material”, Journal of Applied Physics, vol. 119. p. 035101, 2016.
V. Steinmann et al., “The impact of sodium contamination in tin sulfide thin-film solar cells”, APL Materials, vol. 4. p. 026103, 2016.

2015

N. M. Mangan et al., “Framework to predict optimal buffer layer pairing for thin film solar cell absorbers: A case study for tin sulfide/zinc oxysulfide”, Journal of Applied Physics, vol. 118. p. 115102, 2015.
A. Palmer et al., “Sub-Kelvin magnetic and electrical measurements in a diamond anvil cell with in situ tunability”, Review of Scientific Instruments, vol. 86. p. 093901, 2015.
R. Jaramillo et al., “Making Record-efficiency SnS Solar Cells by Thermal Evaporation and Atomic Layer Deposition”, Journal of Visualized Experiments. 2015.
R. Chakraborty et al., “Non-monotonic effect of growth temperature on carrier collection in SnS solar cells”, Applied Physics Letters, vol. 106. p. 203901, 2015.
H. H. Park et al., “Co-optimization of SnS absorber and Zn(O,S) buffer materials for improved solar cells”, Progress in Photovoltaics: Research and Applications, vol. 23. pp. 901-908, 2015.
S. C. Siah et al., “X-Ray Absorption Spectroscopy Study of Structure and Stability of Disordered (Cu SnS ) (ZnS) Alloys”, IEEE Journal of Photovoltaics, vol. 5. pp. 372-377, 2015.
S. C. Siah et al., “Dopant activation in Sn-doped Ga2O3 investigated by X-ray absorption spectroscopy”, Applied Physics Letters, vol. 107. p. 252103, 2015.

2014

V. Steinmann et al., “3.88% Efficient Tin Sulfide Solar Cells using Congruent Thermal Evaporation”, Advanced Materials, vol. 26. pp. 7488-7492, 2014.
V. Stevanović, Hartman, K., Jaramillo, R., Ramanathan, S., Buonassisi, T., and Graf, P., “Variations of ionization potential and electron affinity as a function of surface orientation: The case of orthorhombic SnS”, Applied Physics Letters, vol. 104. p. 211603, 2014.
R. Jaramillo, Ha, S. D., Silevitch, D. M., and Ramanathan, S., “Origins of bad-metal conductivity and the insulator-metal transition in the rare-earth nickelates”, Nature Physics, vol. 10. pp. 304-307, 2014.
F. Yan, Schoofs, F., Shi, J., Ha, S. D., Jaramillo, R., and Ramanathan, S., “Local charge writing in epitaxial SmNiO3 thin films”, Journal of Materials Chemistry C, vol. 2. pp. 3805-3811, 2014.
N. M. Mangan et al., “A path to 10% efficiency for tin sulfide devices”, 2014 IEEE 40th Photovoltaic Specialist Conference (PVSC). IEEE, 2014.

2013

R. Jaramillo, Schoofs, F., Ha, S. D., and Ramanathan, S., “High pressure synthesis of SmNiO3 thin films and implications for thermodynamics of the nickelates”, Journal of Materials Chemistry C, vol. 1. pp. 2455-2462, 2013.
S. D. Ha et al., “Hall effect measurements on epitaxial SmNiO3 thin films and implications for antiferromagnetism”, Physical Review B, vol. 87. p. 125150, 2013.
S. D. Ha, Zhou, Y., Jaramillo, R., and Ramanathan, S., “Correlated Electrons: A Platform for Solid State Devices”, in Future Trends in Microelectronics, John Wiley & Sons, Inc., 2013, pp. 300-307.

2012

R. Jaramillo, Feng, Y., and Rosenbaum, T. F., “Four-probe electrical measurements with a liquid pressure medium in a diamond anvil cell”, Review of Scientific Instruments, vol. 83. pp. 103902-103902, 2012.
Y. Feng et al., “Order Parameter Fluctuations at a Buried Quantum Critical Point”, Proceedings of the National Academy of Sciences, vol. 109. pp. 7224-7229, 2012.
S. D. Ha, Otaki, M., Jaramillo, R., Podpirka, A., and Ramanathan, S., “Stable metal–insulator transition in epitaxial SmNiO3 thin films”, Journal of Solid State Chemistry, vol. 190. pp. 233-237, 2012.
J. Wang, Feng, Y., Jaramillo, R., Van Wezel, J., Canfield, P. C., and Rosenbaum, T. F., “Pressure tuning of competing magnetic interactions in intermetallic CeFe2”, Physical Review B, vol. 86. p. 014422, 2012.
Y. Feng et al., “Order Parameter Fluctuations at a Buried Quantum Critical Point”, Proceedings of the National Academy of Sciences, vol. 109. pp. 7224-7229, 2012.

2011

E. M. Likovich, Jaramillo, R., Russell, K. J., Ramanathan, S., and Narayanamurti, V., “High‐Current‐Density Monolayer CdSe/ZnS Quantum Dot Light‐Emitting Devices with Oxide Electrodes”, Advanced Materials, vol. 23. pp. 4521-4525, 2011.
R. Jaramillo and Ramanathan, S., “Electronic Granularity and the Work Function of Transparent Conducting ZnO:Al Thin Films”, Advanced Functional Materials, vol. 21. pp. 4068-4072, 2011.
Y. Feng, Jaramillo, R., Banerjee, A., Honig, J. M., and Rosenbaum, T. F., “Magnetism, structure, and charge correlation at a pressure-induced Mott-Hubbard insulator-metal transition”, Physical Review B, vol. 83. p. 035106, 2011.
R. Jaramillo and Ramanathan, S., “Kelvin force microscopy studies of work function of transparent conducting ZnO:Al electrodes synthesized under varying oxygen pressures”, Solar Energy Materials and Solar Cells, vol. 95. pp. 602-605, 2011.
E. M. Likovich, Jaramillo, R., Russell, K. J., Ramanathan, S., and Narayanamurti, V., “Scanning tunneling microscope investigation of local density of states in Al-doped ZnO thin films”, Physical Review B, vol. 83. p. 075430, 2011.
E. M. Likovich, Jaramillo, R., Russell, K. J., Ramanathan, S., and Narayanamurti, V., “Narrow band defect luminescence from Al-doped ZnO probed by scanning tunneling cathodoluminescence”, Applied Physics Letters, vol. 99. p. 151910, 2011.

2010

R. Jaramillo, Feng, Y., and Rosenbaum, T. F., “Diffraction line-shapes, Fermi surface nesting, and quantum criticality in antiferromagnetic chromium at high pressure (invited)”, Journal of Applied Physics, vol. 107. pp. 116-09, 2010.
Y. Feng, Jaramillo, R., Wang, J., Ren, Y., and Rosenbaum, T. F., “Invited Article: High-pressure techniques for condensed matter physics at low temperature”, Review of Scientific Instruments, vol. 81. 2010.
R. Jaramillo, Feng, Y., Wang, J., and Rosenbaum, T. F., “Signatures of quantum criticality in pure Cr at high pressure”, Proceedings of the National Academy of Sciences, vol. 107. pp. 13631-13635, 2010.

2009

R. Jaramillo et al., “Breakdown of the Bardeen-Cooper-Schrieffer ground state at a quantum phase transition”, Nature, vol. 459. pp. 405-409, 2009.

2008

R. Jaramillo et al., “Chromium at high pressures: Weak coupling and strong fluctuations in an itinerant antiferromagnet”, Physical Review B (Condensed Matter and Materials Physics), vol. 77. pp. 184418-11, 2008.

2007

Y. Feng et al., “Pressure-tuned spin and charge ordering in an itinerant antiferromagnet”, Physical Review Letters, vol. 99. p. 137201, 2007.
O. G. Shpyrko et al., “Direct measurement of antiferromagnetic domain fluctuations”, Nature, vol. 447. pp. 68-71, 2007.
R. Jaramillo et al., “Microscopic and Macroscopic Signatures of Antiferromagnetic Domain Walls”, Physical Review Letters, vol. 98. pp. 117206-4, 2007.

2006

S. Yuan, Jaramillo, R., Rosenbaum, T. F., and Yu, L., “Synthesis and characterization of conjugated polymers containing first row transition metal complexes”, Macromolecules, vol. 39. pp. 8652-8658, 2006.

2005

Y. Feng et al., “Energy dispersive x-ray diffraction of charge density waves via chemical filtering”, Review of Scientific Instruments, vol. 76. pp. 063913-4, 2005.