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Tyler Grassman

  • Assistant Professor, Materials Science Engineering
  • Dept. of Materials Science and Engineeringg
    488 Watts Hall
    Columbus, OH 43210
  • 614-688-1704


Dr. Tyler J. Grassman is an Assistant Professor in the Department of Materials Science and Engineering at The Ohio State University, with a joint appointment in the Department of Electrical and Computer Engineering. He received his B.S degree in Chemistry from the University of Oregon, and his M.S. and Ph.D. degrees in Materials Science and Engineering from the University of California, San Diego in La Jolla, CA.  After holding a postdoctoral research position in the Electronic Materials and Devices Laboratory and the Institute for Materials Research at OSU, he joined the faculty of the OSU MSE and ECE departments in 2012.

Dr. Grassman’s research interests lie in the development, production, and characterization of novel materials and combinations of materials for electronic and photonic applications.  Of particular focus is the area of photovoltaics, as well as other clean energy technologies.  This work encompasses a wide range of research activities, including (but not necessarily limited to): functional materials epitaxy and epitaxy science; heteroepitaxy and dissimilar materials integration; metamorphic materials; materials characterization and analysis methods; microstructure and defect characterization and engineering; surface and interface science; application and development of electron microscopy techniques; first-principles (ab-initio) materials modeling; multi-scale integrated computational materials engineering; general application of heteroepitaxy and materials integration to electronics and optoelectronics technologies.



  • 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,

Journal Articles


  • Grassman,Tyler,J; Chmielewski,Daniel,J; Carnevale,Santino,D; Carlin,John,A; Ringel,Steven,A, 2016, "GaAs_0.75P_0.25/Si Dual-Junction Solar Cells Grown by MBE and MOCVD." IEEE JOURNAL OF PHOTOVOLTAICS 6, no. 1, 326-331 - 326-331.


  • S. D. Carnevale, J. I. Deitz, J. A. Carlin, Y. N. Picard, D. W. McComb, M. D. Graef, S. A. Ringel and T. J. Grassman, 2015, Applications of Electron Channeling Contrast Imaging for the Rapid Characterization of Extended Defects in III-V/Si Heterostructures. IEEE Journal of Photovoltaics 5, no. 2, 676-682 - 676-682.
  • Deitz,Julia,I; Carnevale,Santino,D; Ringel,Steven,A; McComb,David,W; Grassman,Tyler,J, 2015, "Electron Channeling Contrast Imaging for Rapid III-V Heteroepitaxial Characterization." JOURNAL OF VISUALIZED EXPERIMENTS no. 101, e52745 - e52745.
  • Almansouri,Ibraheem; Bremner,Stephen; Ho-Baillie,Anita; Mehrvarz,Hamid; Hao,Xiaojing; Conibeer,Gavin; Grassman,Tyler,J; Carlin,John,A; Haas,Alexander; Ringel,Steven,A; Green,Martin,A, 2015, "Designing Bottom Silicon Solar Cells for Multijunction Devices." IEEE JOURNAL OF PHOTOVOLTAICS 5, no. 2, 683-690 - 683-690.
  • I. A. Mansouri, S. Bremner, A. Ho-Baillie, H. Mehrvarz, X. Hao, G. Conibeer, T. J. Grassman, J. A. Carlin, A. Haas, S. A. Ringel and M. A. Green, 2015, Designing Bottom Silicon Solar Cells for Multijunction Devices. IEEE Journal of Photovoltaics 5, no. 2, 683-690 - 683-690.
  • Carnevale,Santino,D; Deitz,Julia,I; Carlin,John,A; Picard,Yoosuf,N; McComb,David,W; De Graef,Marc; Ringel,Steven,A; Grassman,Tyler,J, 2015, "Applications of Electron Channeling Contrast Imaging for the Rapid Characterization of Extended Defects in III-V/Si Heterostructures." IEEE JOURNAL OF PHOTOVOLTAICS 5, no. 2, 676-682 - 676-682.
  • Sarwar,ATM Golam; May,Brelon,J; Deitz,Julia,I; Grassman,Tyler,J; McComb,David,W; Myers,Roberto,C, 2015, "Tunnel junction enhanced nanowire ultraviolet light emitting diodes." APPLIED PHYSICS LETTERS 107, no. 10, 101103 - 101103.
  • Paul,P,K; Cardwell,D,W; Jackson,C,M; Galiano,K; Aryal,K; Pelz,J,P; Marsillac,S; Ringel,S,A; Grassman,T,J; Arehart,A,R, 2015, "Direct nm-Scale Spatial Mapping of Traps in CIGS." IEEE JOURNAL OF PHOTOVOLTAICS 5, no. 5, 1482-1486 - 1482-1486.



  • 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 - 142102.


  • 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 - 141905.
  • 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 - 7280-7288.
  • 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 - 063109.


  • Grassman,T,J; Bishop,S,R; Kummel,A,C, 2009, "Density functional theory study of first-layer adsorption of ZrO2 and HfO2 on Ge(100)." MICROELECTRONIC ENGINEERING 86, no. 3, 249-258 - 249-258.


Papers in Proceedings



  • Al Mansouri,Ibraheem; 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. in IEEE Photovoltaic Specialists Conference (PVSC)., (1 2013).
  • Haas,Alexander; Sharps,Paul; Aiken,Daniel; Grassman,Tyler; Carlin,John,A; Ringel,Steven Analysis of Short- and Long-Term Performance Goals for III/V on Active Si Concentrator Solar Cells. in 39th IEEE Photovoltaic Specialists Conference (PVSC)., (1 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?." in 28th European Photovoltaic Solar Energy Conference. (6 2013).
  • 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." in 39th IEEE Photovoltaic Specialists Conference. (6 2013).


  • 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." in 38th IEEE Photovoltaic Specialists Conference (PVSC). (6 2012).



  • 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." in 34th IEEE Photovoltaic Specialists Conference. (1 2009).


  • Kummel,A,C; Grassman,T; Winn,D,L; Hale,M,J; Sexton,J,Z; Passlack,M; Droopad,R "Influence of atomic structure on electronic structure for oxide-semiconductor interfaces.." in 229th National Meeting of the American-Chemical-Society (ACS). (3 2005).


  • Miller,K,A; Toal,S,J; Bodde,S,G; Sexton,J,Z; Tran,N; Grassman,T; Fruhberger,B; Ramirez,M,IM; Kummel,A,C; Schuller,I,K; TROGLER,W,C "Metallophthalocyanine based chemical sensors for chemical warfare agents.." in 227th National Meeting of the American-Chemical Society. (3 2004).