Je-Hyeong Bahk, PhD

Assistant Professor, Mechanical Engineering, Department of Mechanical and Materials Engineering

Assistant Professor, Electrical Engineering, Department of Electrical Engineering and Computing Systems


Biography

Je-Hyeong Bahk holds a PhD he earned in 2010 in Electrical and Computer Engineering from the University of California, Santa Barbara, where his thesis was titled “Electron transport in ErAs:InGa(Al)As metal/semiconductor nanocomposites for thermoelectric power generation.” His Master of Science and Bachelor of Science are both in Electrical Engineering from Seoul National University, where he graduated with honors.

Upon completion of his PhD, Bahk worked as a postdoctoral research associate at the University of California, Santa Cruz from 2010 to 2012 and at Purdue University from 2012-2015. His research in thermoelectrics has led him to write three book chapters, more than fifty journal & conference papers, and create several online simulation tools related to thermoelectric devices and materials. Bahk is also a member of several professional organizations including IEEE, MRS, APS, and in 2013 served as the session chair at the Frontiers in Education Conference.

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Bahk


Research Interests

  • Human body-heat energy harvesting, wearable/flexible electronics, medical sensors; Additive manufacturing of functional materials, organic semiconductors, nanoscale devices; Nano-scale electron/thermal transport physics and materials for thermoelectric energy conversion; Nano- and micro-scale device fabrication and characterization. Teaching interests include:  Solid-state physics, quantum mechanics, electron/thermal transport in semiconductors (graduate level); Heat transfer, thermodynamics, classical mechanics and physics (undergraduate level).


Professional Experience

Purdue University, West Lafayette, IN
Postdoctoral research associate, Birck Nanotechnology Center
2012-2015
University of California, Santa Cruz, CA
Postdoctoral research associate, Jack Baskin School of Engineering
2010-2012
University of California, Santa Barbara, CA
Research Assistant, Department of Electrical and Computer Engineering

2005-2010

Korea Institute of Science and Technology, Seoul, Korea
Commissioned research scientist, Photonics Research Center
2003-2004

 

Honors and Awards

Editor’s choice paper award, Journal of Electronic Materials 2010
Scholarship for studying abroad, Ministry of Information and Communication, Korea 2004-2006
Awarded by Deputy Chief of Staff for Intelligence and Operations (Major general), Headquarter, Republic of Korea Army 2001
Graduate with honors, School of Electrical Engineering, Seoul Nat’l University 1998
Scholarship of partial tuition and admission fee (undergraduate entrance) 1994


Online Simulation Tools

 J.-H. Bahk, M. Youngs, Z. Schaffter, K. Yazawa, and A. Shakouri, “Thin-Film and Multi-Element Thermoelectric Devices Simulator,” published on nanoHUB.org (https://nanohub.org/tools/thermo) Jun. 2013

J.-H. Bahk, R. B. Prost, K. Margatan, and A.Shakouri, “Linearized Boltzmann Transport Calculator for Thermoelectric Materials,” published on nanoHUB.org (https://nanohub.org/tools/btesolver) Oct. 2013

K. Yazawa, K. Margatan, J.-H. Bahk, and A.Shakouri, “Thermoelectric Power Generator System Optimization and Cost Analysis,” published on nanoHUB.org (https://nanohub.org/tools/tedev) Oct. 2013

J.-H. Bahk, K. Margatan, K. Yazawa, and A. Shakouri, “Advanced thermoelectric device simulation for waste heat recovery and wearable energy harvesting,” to be published on nanoHUB.org (https://nanohub.org/tools/teadv) Aug. 2015


Selected Book Chapters

J.-H. Bahk, T. Favaloro, and A. Shakouri, “Thin film thermoelectric characterization techniques,” Chap. 3, Annual Reviews of Heat Transfer vol.16, Ed. G. Chen (Begell House Inc., New York, 2013).

J.-H. Bahk and A. Shakouri, “Electron transport engineering by nanostructures for efficient thermoelectrics,” Chap. 2 in Nanoscale Thermoelectrics, Ed. X. Wang and Z. Wang, a book series of Lecture Notes on Nanoscale Science and Technology vol. 16 (Springer, Nov. 2013).

C. Kang, H. Wang, J.-H. Bahk, H. Kim, and W. Kim, “Thermoelectric materials and devices,” Chap. 6 in Hierarchical Nanostructures for Energy Devices, RSC Nanoscience and Nanotechnology Series No. 35, Ed. S. H. Ko and C. P. Grigoropoulos (RSC Publishing, 2015).


Selected Recent Journal Articles

J.-H. Bahk, H. Fang, K. Yazawa, and A. Shakouri, “Flexible thermoelectric materials and device optimization for wearable energy harvesting,” submitted to J. Mater. Chem. C (2015)

L. Shi, C. Dames, J. R. Lukes, P. S. Reddy, J. Duda, D. G. Cahill, J. Lee, A. Marconnet, K. E. Goodson, J.-H. Bahk, Ali Shakouri, R. S. Prasher, J. Felts, W. P. King, B. Han, and J. C. Bischof, “Evaluating broader impacts of nanoscale thermal transport research,” Nanosc. and Microsc. Therm., 19, 127-165 (2015).

T. Favaloro, J.-H. Bahk, and A. Shakouri, "Characterization of the temperature dependence of the thermoreflectance coefficient for conductive thin films," Rev. Sci. Instrum. 86, 024903 (2015).

H. Yang, J.-H. Bahk, T. Day, A. M. S. Mohammed, G. J. Snyder, A. Shakouri, and Y. Wu, “Enhanced thermoelectric properties in bulk nanowire heterostructure-based nanocomposites through minority carrier blocking,” Nano Lett. 15, 1349 (2015).

V. Sahu, Y. K. Joshi, A. G. Fedorov, J.-H. Bahk, X. Wang, and A. Shakouri, “Experimental characterization of hybrid solid-state and fluidic cooling for thermal management of localized hotspots,” IEEE Trans. Compon. Packag. Manuf. Technol. 5, 57 (2015).

H. Yang, J.-H. Bahk, T. Day, A. M. S. Mohammed, B. Min, G. J. Snyder, A. Shakouri, and Y. Wu, “Composition modulation of Ag2Te nanowires for tunable electrical and thermal properties,” Nano Lett. 14, 5398 (2014).

J.-H. Bahk, and A. Shakouri, “Enhancing the thermoelectric figure of merit through the reduction of bipolar thermal conductivity with heterostructure barriers,” Appl. Phys. Lett.105, 052106 (2014).

T. Favaloro, A. Ziabari, J.-H. Bahk, P. Burke, H. Lu, J. Bowers, A. Gossard, Z. Bian and A. Shakouri, “High temperature thermoreflectance imaging and transient Harman characterization of thermoelectric energy conversion devices,” J. Appl. Phys. 116, 034501 (2014).

H. Wang, J.-H. Bahk, C. Kang, J. Hwang, K. Kim, J. Kim, P. Burke, J. E. Bowers, A. Shakouri, and W. Kim, “Right sizes of nano- and microstructures for high performance and rigid bulk thermoelectrics,” Proc. Natl. Acad. Sci. 111, 10949 (2014).

S. W. Finefrock, G. Zhang, J.-H. Bahk, H. Fang, H. Yang, A. Shakouri, and Y. Wu, “Structure and thermoelectric properties of spark plasma sintered ultrathin PbTe nanowires,” Nano Lett. 14, 3466 (2014).

Y. Zhang, J.-H. Bahk, J. Lee, C. Birkel, M. Snedaker, D. Liu, H. Zeng, M. Moskovits, A. Shakouri, and G. Stucky, “Hot carrier filtering in solution processed hetero-structures: a paradigm for improving thermoelectric efficiency,” Adv. Mater. 26, 2755 (2014).

J.-H. Bahk, Z. Bian, and A. Shakouri “Electron transport modeling and energy filtering for efficient thermoelectric Mg2Si1-xSnx solid solutions,” Phys. Rev. B 89, 075204 (2014).

B. Vermeersch, G. Pernot, H. Lu, J.-H. Bahk, A. Gossard, and A. Shakouri. “Picosecond Joule heating in photoconductive switch electrodes,” Phys. Rev. B 88, 214302 (2013).

J. Kim, J.-H. Bahk, J. Hwang, H. Kim, H. Park, and W. Kim, “Thermoelectricity in semiconductor nanowires,” Phys. Status Solidi RRL 7, 767 (2013).

H. Wang, J.-H. Bahk, C. Kang, J. Hwang, K. Kim, A. Shakouri, and W. Kim, “Large enhancement in the thermoelectric properties of Pb0.98Na0.02Te by optimizing the synthesis conditions,” J. Mater. Chem. A 1, 11269 (2013).

J.-H. Bahk, Z. Bian, and A. Shakouri, “Electron energy filtering by a non-planar barrier to enhance the thermoelectric power factor in bulk materials,” Phys. Rev. B 87, 075204 (2013).


Invited Presentations

J.-H. Bahk, “Nanoscale thermoelectric energy conversion: materials and devices,” Seminar, LG Chem Research Inst., Daejun, Korea, Dec. 18, 2013.

J.-H. Bahk, “Hot carrier energy filtering for efficient thermoelectrics,” Nano-Thermoelectric Material Team Workshop at Korea Univ., Seoul, Korea, Nanomaterial Technology Development Program, Natl. Res. Found. Korea, Jul. 19, 2013.                                                                 

J.-H. Bahk, “Engineering electron transport by nanostructures for efficient thermoelectric energy conversion,” The 2nd Annual Thermoelectric Workshop, Korea Electrotechnology Research Institute, Kyungju, Korea, Dec. 13, 2012.

J.-H. Bahk, Y. Ezzahri, K. Yazawa, B. Vermeersch, G. Pernot, and A. Shakouri, “Nanoscale electrothermal energy conversion devices,” THERMINIC 2012, Budapest, Hungary, Sep. 27, 2012.

J.-H. Bahk, “Nanoscale thermoelectric energy conversion: materials and devices,” Seminar, Samsung Advanced Institute of Technology Suwon, Korea, Jul. 27, 2012. 

J.-H. Bahk, “Nanoscale thermoelectric energy conversion: materials and devices,” Seminar, Mechanical Engineering Dept., Yonsei Univ., Seoul, Korea, Jul. 24, 2012.

J.-H. Bahk, Z. Bian, and A. Shakouri, “Nanoscale thermionic and thermoelectric materials and devices,” IEEE Nanotechnol. Mater. Devices Conf., Monterey, CA, USA, Oct. 14, 2010.