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Tyler J. Grassman

  • Research Assistant Professor, Materials Science Engineering
  • Dept. of Materials Science and Engineering
    278 Watts
    Columbus, OH 43210
  • 614-688-1704

About

Title

Research Assistant Professor, Electrical and Computer Engineering
Research Assistant Professor, Materials Science Engineering

Education

PhD, University of California – San Diego, 2007

Areas of interest

Development and integration of novel electronic and optoelectronic materials, and the study of their surfaces, interfaces, and defects, with a focus on photovoltaics and other clean energy and energy efficiency applications.

Office

Watts 278 (MSE)

Chapters

2011

  • S. A. Ringel, T. J. Grassman. 2011. "Chapter 14: III-V Solar Cells on Silicon." In III-V Compound Semiconductors: Integration with Silicon-Based Microelectronics, edited by T. Li, M. Mastro, A. Dadgar, Boca Raton: CRC Press.

Journal Articles

2015

2014

2013

  • Grassman, T. J. Carlin, J. A. Galiana, B. Yang, L. M. Yang, F. Mills, M. J. Ringel, S. A., 2013, "Nucleation-related defect-free GaP/Si(100) heteroepitaxy via metal-organic chemical vapor deposition." Applied Physics Letters 102, no. 14, 142102 -

2011

  • RATCLIFF,C; Grassman,T,J; Carlin,J,A; Ringel,S,A, 2011, "High temperature step-flow growth of gallium phosphide by molecular beam epitaxy and metalorganic chemical vapor deposition." APPLIED PHYSICS LETTERS 99, no. 14, 141905 -
  • Swaminathan,K; Grassman,T,J; Yang,L-M; Gu,Q; Mills,M,J; Ringel,S,A, 2011, "Optically-aligned visible/near-infrared dual-band photodetector materials and devices on GaAs using metamorphic epitaxy." JOURNAL OF APPLIED PHYSICS 110, no. 6, 063109 -
  • Swaminathan,K; Yang,L-M; Grassman,T,J; Tabares,G; Guzman,A; Hierro,A; Mills,M,J; Ringel,S,A, 2011, "Metamorphic In0.20Ga0.80As p-i-n photodetectors grown on GaAs substrates for near infrared applications." OPTICS EXPRESS 19, no. 8, 7280 - 7288.

2010

  • Grassman,Tyler,J; Brenner,Mark,R; Gonzalez,Maria; Carlin,Andrew,M; Unocic,Raymond,R; Dehoff,Ryan,R; Mills,Michael,J; Ringel,Steven,A, 2010, "Characterization of Metamorphic GaAsP/Si Materials and Devices for Photovoltaic Applications." IEEE TRANSACTIONS ON ELECTRON DEVICES 57, no. 12, 3361 - 3369.
  • Lee,Joon,Sung; Bishop,Sarah,R; Grassman,Tyler,J; Kummel,Andrew,C, 2010, "Plasma nitridation of Ge(100) surface studied by scanning tunneling microscopy." SURFACE SCIENCE 604, no. 15-16, 1239 - 1246.

2009

  • Grassman,T,J; Brenner,M,R; Rajagopalan,S; Unocic,R; DEHOFF,R; Mills,M; Fraser,H; Ringel,S,A, 2009, "Control and elimination of nucleation-related defects in GaP/Si(001) heteroepitaxy." APPLIED PHYSICS LETTERS 94, no. 23, 232106 -
  • Tran,N,L; Bishop,S,R; Grassman,T,J; Poon,G,C; Bohrer,F,I; TROGLER,W,C; Kummel,A,C, 2009, "NO chemisorption dynamics on thick FePc and ttbu-FePc films." JOURNAL OF CHEMICAL PHYSICS 130, no. 17, 174305 -
  • Feldwinn,Darby,L; Clemens,Jonathon,B; Shen,Jian; Bishop,Sarah,R; Grassman,Tyler,J; Kummel,Andrew,C; Droopad,Ravi; Passlack,Matthias, 2009, "Anomalous hybridization in the In-rich InAs(001) reconstruction." SURFACE SCIENCE 603, no. 22, 3321 - 3328.

2008

  • Grassman,Tyler,J; Bishop,Sarah,R; Kummel,Andrew,C, 2008, "An atomic view of Fermi level pinning of Ge(100) by O-2." SURFACE SCIENCE 602, no. 14, 2373 - 2381.

2007

  • Winn,Darby,L; Hale,Michael,J; Grassman,Tyler,J; Kummel,Andrew,C; Droopad,Ravi; Passlack,Matthias, 2007, "Direct and indirect causes of Fermi level pinning at the SiO/GaAs interface." JOURNAL OF CHEMICAL PHYSICS 126, no. 8, 084703 -
  • Winn,Darby,L; Hale,Michael,J; Grassman,Tyler,J; Sexton,Jonathan,Z; Kummel,Andrew,C, 2007, "Electronic properties of adsorbates on GaAs(001)-c(2x8)/(2x4)." JOURNAL OF CHEMICAL PHYSICS 127, no. 13, 134705 -

2005

  • Hale,M,J; Winn,D,L; Grassman,T,J; Kummel,A,C; Droopad,R, 2005, "Chemically resolved scanning tunneling microscopy imaging of Al on p-type Al0.1Ga0.9As(001)-c(2x8)/(2x4)." JOURNAL OF CHEMICAL PHYSICS 122, no. 12, 124702 -

2004

  • Grassman,T,J; Poon,G,C; Kummel,A,C, 2004, "Low coverage spontaneous etching and hyperthermal desorption of aluminum chlorides from Cl-2/Al(111)." JOURNAL OF CHEMICAL PHYSICS 121, no. 18, 9018 - 9030.

2003

  • Poon,G,C; Grassman,T,J; Gumy,J,C; Kummel,A,C, 2003, "Direct and precursor-mediated hyperthermal abstractive chemisorption of Cl-2/Al(111)." JOURNAL OF CHEMICAL PHYSICS 119, no. 18, 9818 - 9828.

2000

  • Grassman,T,J; Knowles,M,K; Marcus,A,H, 2000, "Structure and dynamics of fluorescently labeled complex fluids by Fourier imaging correlation spectroscopy." PHYSICAL REVIEW E 62, no. 6, 8245 - 8257.
  • Knowles,M,K; Grassman,T,J; Marcus,A,H, 2000, "Measurement of the dynamic structure function of fluorescently labeled complex fluids by Fourier imaging correlation spectroscopy." PHYSICAL REVIEW LETTERS 85, no. 13, 2837 - 2840.

Papers in Proceedings

2014

  • C. Ratcliff, T. J. Grassman, J. A. Carlin, D. J. Chmielewski, S. A. Ringel "Ga-rich GaxIn1-xP solar cells on Si with 1.95 eV bandgap for ideal III-V/Si photovoltaics." JOURNAL: "Proceedings of the SPIE 8981." in Proceedings of the SPIE 8981. (3 2014). 898118 -
  • S. D. Carnevale, J. I. Deitz, J. A. Carlin, Y. N. Picard, M. De Graef, S. A. Ringel and T. J. Grassman Rapid characterization of extended defects in III-V/Si by electron channeling contrast imaging. JOURNAL: "40th IEEE Photovoltaic Specialist Conference." in 40th IEEE Photovoltaic Specialist Conference. http://dx.doi.org/10.1109/pvsc.2014.6925512, (6 2014). 2800 - 2803.
  • J. Deitz, S. Carnevale, M. De Graef, Y. N. Picard, S. A. Ringel, T. J. Grassman, D. W. McComb "Using Electron Channeling Contrast Imaging for Misfit Dislocation Characterization in Heteroepitaxial III-V/Si Thin Films." JOURNAL: "Microscopy and Microanalysis." in Microscopy and Microanalysis. (8 2014). 552 - 553.

2013

  • M.A. Green, X. Hao, S. Bremner, G. J. Conibeer, I. Al Mansouri, N. Song, Z. Liu, S. A. Ringel, J. A. Carlin, T. J. Grassman, B. Galiana, A. M. Carlin, C. Ratcliff, D. Chmielewski, L. Yang, M. J. Mills, G. Teeter, M. Young "Silicon Wafer-Based Tandem Cells: The Ultimate Photovoltaic Solution?." JOURNAL: "39th IEEE Photovoltaic Specialists Conference." in 28th European Photovoltaic Solar Energy Conference. (6 2013). 7 - 10.
  • Mansouri, Ibraheem Al, Bremner, Stephen, Ho-Baillie, Anita, Mehrvarz, Hamid, Hao, Xiaojing, Conibeer, Gavin, Green, Martin A., Grassman, Tyler J., Carlin, John A., Ringel, Steven A. "Design of bottom silicon solar cell for multijunction devices." JOURNAL: "39th IEEE Photovoltaic Specialists Conference." in 39th IEEE Photovoltaic Specialists Conference. (6 2013). 3310 - 3314.
  • D. J. Chmielewski, T. J. Grassman, A. M. Carlin, C. Ratcliff, S. A. Ringel "Metamorphic Tunnel Junctions for High Efficiency III-V/IV Multi-Junction Solar Cell Technology." JOURNAL: "39th IEEE Photovoltaic Specialists Conference." in 39th IEEE Photovoltaic Specialists Conference. (6 2013). 0882 - 0885.
  • Tyler J. Grassman, Deep B. Shah, John A. Carlin, Steven A. Ringel "Exploration of Epitaxial Quantum Dots within Wide Band Gap Metamorphic Host Materials for Intermediate Band Solar Cells." JOURNAL: "39th IEEE Photovoltaic Specialists Conference." in 39th IEEE Photovoltaic Specialists Conference. (6 2013). 0284 - 0287.
  • S. A. Ringel, J. A. Carlin, T. J. Grassman, B. Galiana, A. M. Carlin, C. Ratcliff, D. J. Chmielewski, L. Yang, M. J. Mills, I. Al-Mansouri, S. P. Bremner, A. Ho-Baillie, X. Hao, H. Mehrvarz, G. Conibeer, M. A. Green "Ideal GaP/Si Heterostructures Grown by MOCVD: III-V/Active-Si Subcells, Multijuntions, and MBE-to-MOCVD III-V/Si Interface Science." JOURNAL: "39th IEEE Photovoltaic Specialists Conference." in 39th IEEE Photovoltaic Specialists Conference. (6 2013). 3383 - 3388.
  • A. Haas, P. Sharps, D. Aiken, T. J. Grassman, J. A. Carlin, S. A. Ringel "Analysis of Short- and Long-Term Performance Goals for III/V on Active Si Concentrator Solar Cells." JOURNAL: "39th IEEE Photovoltaic Specialists Conference." in 39th IEEE Photovoltaic Specialists Conference. (6 2013). 0867 - 0872.
  • Tyler J. Grassman, John A. Carlin, Chris Ratcliff, Daniel J. Chmielewski, Steven A. Ringel "Epitaxially-Grown Metamorphic GaAsP/Si Dual-Junction Solar Cells." JOURNAL: "39th IEEE Photovoltaic Specialists Conference." in 39th IEEE Photovoltaic Specialists Conference. (6 2013). 0149 - 0153.
  • Grassman, Tyler J. Ratcliff, Chris Carlin, Andrew M. Carlin, John A. Yang, Limei Mills, Michael J. Ringel, Steven A. "III-V/GaP Epitaxy on Si for Advanced Photovoltaics and Green Light Emitters." JOURNAL: "ECS Transactions." in ECS PRiME 2012. (3 2013). 321 -

2012

  • Swaminathan,K; Grassman,T,J; Yang,L-M; Chmielewski,D; Mills,M; Ringel,S,A "Impact of threading dislocation density on metamorphic InxGa1-xAs and InzGa1-zP p-i-n photodetectors on GaAs." in Conference on Optical Components and Materials IX. BELLINGHAM, (1 2012). 82571A -
  • Carlin,Andrew,M; Grassman,Tyler,J; Brenner,Mark,R; Grandal,Javier; Ratcliff,Chris; Yang,Limei; Mills,Michael; Sharma,Prithu; Fitzgerald,Eugene,A; Ringel,Steven,A "Lattice-Matched GaP/SiGe Virtual Substrates for Low-Dislocation Density GaInP/GaAsP/Si Solar Cells." JOURNAL: "38TH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE." in 38th IEEE Photovoltaic Specialists Conference (PVSC). (6 2012). 918 - 921.
  • Grassman,Tyler,J; Carlin,Andrew,M; Grandal,Javier; Ratcliff,Chris; Yang,Limei; Mills,Michael,J; Ringel,Steven,A "Spectrum-optimized Si-based III-V multijunction photovoltaics." in Conference on Physics, Simulation and Photonic Engineering of Photovoltaic Devices. BELLINGHAM, (1 2012). 82560R -
  • Grandal,Javier; Grassman,Tyler,J; Carlin,Andrew,M; Brenner,Mark,R; Galiana,Beatriz; Carlin,John,A; Yang,Limei; Mills,Michael,J; Ringel,Steven,A "Growth and characterization of InGaAs quantum dots on metamorphic GaAsP templates by molecular beam epitaxy." JOURNAL: "38TH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE." in 38th IEEE Photovoltaic Specialists Conference (PVSC). (6 2012). 1783 - 1787.

2011

  • Grassman, T. J. Carlin, A. M. Swaminathan, K. Ratcliff, C. Grandal, J. Yang, L.-M. Mills, M. J. Ringel, S. A. "Expanding the Palette: Metamorphic Strategies over Multiple Lattice Constant Ranges for Extending the Spectrum of Accessible Photovoltaic Materials." JOURNAL: "37th IEEE Photovoltaic Specialists Conference." in 37th IEEE Photovoltaic Specialists Conference. (6 2011). 003375 -
  • L.-M. Yang, K. Swaminathan, T. Grassman, S. Ringel, M. Mills Threading Dislocations in Metamorphic In0.20Ga0.80As Grown on GaAs Substrates. JOURNAL: "Microscopy and Microanalysis." in Microscopy and Microanalysis. http://dx.doi.org/10.1017/S1431927611009135, (8 2011). 1652 - 1653.

2010

  • Grassman,T,J; Carlin,A,M; Ringel,S,A "METAMORPHIC GAASP AND INGAP PHOTOVOLTAIC MATERIALS ON SI FOR HIGH-EFFICIENCY III-V/SI MULTIJUNCTION SOLAR CELLS." JOURNAL: "35TH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE." in 35th IEEE Photovoltaic Specialists Conference. (1 2010). 2029 - 2033.

2009

  • Grassman,T,J; Bishop,S,R; Kummel,A,C "Density functional theory study of first-layer adsorption of ZrO2 and HfO2 on Ge(100)." JOURNAL: "MICROELECTRONIC ENGINEERING." in 4th IEEE International Symposium on Advanced Gate Stack Technology (ISAGST). (3 2009). 249 - 258.
  • Grassman,T,J; Brenner,M,R; Carlin,A,M; Rajagopalan,S; Unocic,R; DEHOFF,R; Mills,M; Fraser,H; Ringel,S,A "Toward Metamorphic Multijunction GaAsP/Si Photovoltaics Grown on Optimized GaP/Si Virtual Substrates Using Anion-Graded GaAsyP1-y Buffers." JOURNAL: "2009 34TH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE, VOLS 1-3." in 34th IEEE Photovoltaic Specialists Conference. (1 2009). 2011 - 2016.

2007

  • D. L. Winn, T. J. Grassman, A. C. Kummel "Electronic properties of adsorbates on In0.37Ga0.63As(001)-(2×4)." JOURNAL: "ECS Transactions." in 212th ECS Meeting. (9 2007). 441 -