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Zachary Holman

Asst Professor
Faculty, TEMPE Campus, Mailcode 5706
Senior Sustainability Scientist
Faculty, TEMPE Campus, Mailcode 5706
Biography

Zachary Holman is an Assistant Professor and an ASU Trustees Professor in the School of Electrical, Computer, and Energy Engineering at Arizona State University. He received his Ph.D. in Mechanical Engineering from the University of Minnesota for his work on plasma-synthesized silicon and germanium nanocrystals, after which he spent two years as a postdoctoral researcher developing high-efficiency silicon solar cells at EPFL in Switzerland. His research group at ASU focuses on new materials and device designs for high-efficiency silicon solar cells and silicon-based tandem solar cells. He is also the co-founder of an advanced materials start-up company, Swift Coat.

Education
  • Ph.D. Mechanical Engineering, University of Minnesota, 2010
  • B.A. Physics, Reed College, 2005
Research Interests

Zak's broad research interests span the fields of solar cells, coatings, nanotechnology, semiconductors, plasmas, and aerosols. Specific interests include silicon-based tandem solar cells, contacts to solar cells, light management in silicon solar cells, novel uses of nanoparticles in devices, semiconductor nanoparticles, optical and electronic properties of nanoscale materials, plasma synthesis of powders, and deposition of powders and thin films.

Publications

(Last two years, peer-reviewed journal articles)

49. P. Firth and Z. Holman, “Uniform nanoparticle thin films with independently tunable thickness and porosity formed via aerosol impaction-driven assembly,” (under review).

48. B. Hallam, D. Chen, J. Shi, R. Einhaus, Z. Holman, and S. Wenham, “Pre-fabrication gettering and tydrogenation treatments for silicon heterojunction solar cells: A possible path to >700 mV open-circuit voltages using low-lifetime commercial-grade p-type Czochralski silicon,” (under review).

47. S. Manzoor, Z. Yu, A. Ali, W. Ali, K. Bush, A. Palmstrom, S. Bent, M. McGehee, and Z. Holman, “Improved light management in planar silicon and perovskite solar cells using PDMS scattering layer,” Sol. Energy Mater. Sol. Cells 173, 59–65 (2017).

46. J. Becker, C. Campbell, Y. Zhao, M. Lassise, X.-H. Zhao, M. Boccard, Z. Holman, and Y.-H. Zhang, “11.2%-efficient monocrystalline Mg0.13Cd0.87Te solar cell with 1.7-eV bandgap,” IEEE J. Photovoltaics (in press).

45. M. Vaisman, K. Nay Yaung, E. Perl, D. Martín-Martín, Z. Yu, M. Leilaeioun, Z. Holman, and M. Lee, “15.3%-efficient GaAsP top cells for high-efficiency, low-cost III-V/Si tandem photovoltaics,” ACS Energy Lett. 2, 1911–1918 (2017).

44. M. Boccard, P. Firth, Z. Yu, K. Fisher, M. Leilaeioun, S. Manzoor, and Z. Holman, “Low-refractive-index nanoparticle interlayers to reduce parasitic absorption in metallic rear reflectors of solar cells,” Phys. Status Solidi A 214, 1700179 (2017).

43. J. Carpenter, M. Bailly, A. Boley, J. Shi, M. Minjares, D. Smith, S. Bowden, and Z. Holman, “Substrate-independent analysis of microcrystalline silicon thin films using UV Raman spectroscopy,” Phys. Status Solidi B 254, 1700204 (2017).

42. R. Saive, M. Boccard, T. Saenz, S. Yalamanchili, C. Bukowsky, P. Jahelka, Z. Yu, J. Shi, Z. Holman, and H. Atwater, “Silicon heterojunction solar cells with effectively transparent front contacts,” Sust. Energy Fuels 1, 593–598 (2017).

41. C. Zhang, L. Ding, M. Boccard, T. Nærland, N. Faleev, S. Bowden, Z. Holman, M. Bertoni, and C. Honsberg, “Practical approaches to mitigate minority-carrier lifetime degradation in Si wafers for III-V/Si integration,” (under review).

40. J. Becker, M. Boccard, C. Campbell, Y. Zhao, M. Lassise, Z. Holman, and Y.-H. Zhang, “Loss analysis of monocrystalline CdTe solar cells with 20% active-area efficiency,” IEEE J. Photovoltaics 7, 900–905 (2017).

39. K. Bush*, A. Palmstrom*, Z. Yu*, M. Boccard, R. Cheacharoen, J. Mailoa, D. McMeekin, R. Hoye, C. Bailie, T. Leijtens, I. Peters, M. Minichetti, N. Rolston, R. Prasanna, S. Sofia, D. Harwood, W. Ma, F. Moghadam, H. Snaith, T. Buonassisi, Z. Holman, S. Bent, and M. McGehee, “23.6%-efficient monolithic perovskite/silicon tandem solar cells with improved stability,” Nature Energy 2, 17009 (2017). * Denotes co-first author.

38. J. Becker, C. Campbell, Y. Zhao, M. Boccard, D. Mohanty, M. Lassise, E. Suarez, I. Bhat, Z. Holman, and Y.-H. Zhang, “Monocrystalline CdTe/MgCdTe double-heterostructure solar cells with ZnTe hole contact,” IEEE J. Photovoltaics 7, 307–312 (2017).

37. M. Leilaeioun and Z. Holman, “Accuracy of expressions for the fill factor of a solar cell in terms of its open-circuit voltage and ideality factor,” J. Appl. Phys. 120, 123111 (2016).

36. Z. Yu, M. Leilaeioun, and Z. Holman, “Selecting tandem partners for silicon solar cells using spectral efficiency,” Nature Energy 1, 16137 (2016).

35. Z.-Y. He, C. Campbell, M. Lassise, Z.-Y. Lin, J. Becker, Y. Zhao, M. Boccard, Z. Holman, and Y.-H. Zhang, “CdTe nBn photodetectors with ZnTe barrier layer grown on InSb substrates,” Appl. Phys. Lett. 109, 121112 (2016).

34. S. Vorndran, B. Chrysler, B. Wheelwright, R. Angel, Z. Holman, and R. Kostuk, “Off-axis holographic lens spectrum splitting system for direct and diffuse solar energy conversion,” Appl. Opt. 55, 7522–7529 (2016).

33. B. Chen, Y. Bai, Z. Yu, T. Li, X. Zheng, Q. Dong, M. Boccard, A. Gruverman, Z. Holman, and J. Huang, “Efficient semi-transparent perovskite solar cells for 23%-efficiency perovskite/silicon four-terminal tandem cells,” Adv. Energy Mat. 1601128 (2016).

32. J. Shi, M. Boccard, and Z. Holman, “Plasma-initiated rehydrogenation of amorphous silicon to increase the temperature processing window of silicon heterojunction solar cells,” Appl. Phys. Lett. 109, 031601 (2016).

31. Z. Yu, B. Wheelwright, S. Manzoor, and Z. Holman, “Silicon wafers with optically specular surfaces formed by chemical polishing,” J. Mater. Sci. Mater. Electron. 27, 10270–10275 (2016).

30. Y. Zhao, M. Boccard, S. Liu, J. Becker, X.-H. Zhao, C. Campbell, E. Suarez, M. Lassise, Z. Holman, and Y.-H. Zhang, “Monocrystalline CdTe solar cells with open-circuit voltage over 1 V and efficiency of 17%,” Nature Energy 1, 16067 (2016).

Research Activity

10/2017–09/2020  DOE PVRD-II, “Perovskite-on-silicon tandem solar cells,” (Co-PI)

10/2017–09/2019  DOE DuraMAT, “Silicon IBC modules with copper foil electrodes: Failure mechanisms of electrically conductive adhesive bonds between cells and foil,” (PI)

10/2017–09/2018  BAPVC, “Low capex solar manufacturing enabled by perovskite semiconductors,” (Co-PI)

05/2017–04/2019  NSF EAGER, “Collaborative research: 30%-efficient, stable perovskite/silicon monolithic tandem solar cells,” (PI)

02/2017–04/2017  NSF SBIR, “ The aerosol-spray deposition of photoluminescent quantum-dot coatings on substrates,” (Co-PI)

01/2017–12/2019  ARPA-E SHIELD, “Single-pane windows with insulating sprayed particulate coatings,” (PI)

12/2016–11/2017  NSF SBIR, “ Low damage sputter magnetron for silicon heterojunction PV production,” (Co-PI)

11/2016–10/2018  DOE NextGen-III, “Developing efficient silicon cells for perovskite/silicon tandem devices,” (Co-PI)

09/2016–08/2017  American Jobs Project, “Arizona’s advanced energy landscape,” (PI)

08/2016–07/2019  DOE PVRD, “Monolithic silicon module manufacturing at < 0.40 $/W,” (PI)

08/2016–07/2018  DOE PVRD, “15%-efficiency (Mg,Zn)CdTe solar cells with 1.7 eV bandgap for tandem applications,” (PI)

08/2016–07/2017  SolarReserve, “Hybrid heliostat development,” (PI)

07/2016–01/2017  FSE Technology Innovation Laboratory, “Advanced manufacturing of nanoparticle-based coatings,” (PI)

06/2016–05/2017  DOE PVRD SIPS, “A new class of tandems: Optically coupled III-V/silicon module with outdoor efficiency exceeding 30%,” (PI)

05/2016–11/2016  FSE Technology Innovation Laboratory, “Hybrid heliostat for combined photovoltaic and solar thermal power plants,” (PI)

04/2016–03/2019  NSF REU Site, “Solar energy research for the Terawatt Challenge,” (PI)

01/2016–12/2018  DOE SuNLaMP, “Overcoming bottlenecks to low-cost, high-efficiency Si PV and industrially relevant, ion implanted interdigitated back passivated contact cell development,” (Co-PI)

09/2015–08/2018  NSF Energy for Sustainability, “Collaborative research: 30%-efficient III-V/silicon tandem solar cells,” (PI)

06/2015–05/2020  USAID, “U.S.-Pakistan Centers for Advanced Studies in Energy,” (Co-PI)

05/2015–04/2016  ARPA-E I-Corps Supplement, “PVMirror: Cost competitive solar with storage,” (PI)

02/2015–01/2017  RCSA Scialog, “Scalable tandem architecture for solar water splitting,” (PI)

06/2014–05/2017  ARPA-E FOCUS, “PVMirror: A solar concentrator mirror incorporating PV cells,” (PI)

09/2013–08/2016  DOE FPACE-II, “Thin silicon solar cells: A path to 35% Shockley-Queisser limits,” (Co-PI)

08/2011–07/2021  NSF/DOE ERC, “Quantum Energy and Sustainable Solar Technologies: QESST,” (Co-PI)

06/2010–08/2010  NSF EAPSI, “Novel solar cells using silicon nanocrystals synthesized in an atmospheric-pressure plasma,” (PI)

Spring 2018
Course NumberCourse Title
EEE 492Honors Directed Study
EEE 493Honors Thesis
EEE 499Individualized Instruction
EEE 590Reading and Conference
EEE 592Research
EEE 595Continuing Registration
EEE 599Thesis
EEE 690Reading and Conference
EEE 790Reading and Conference
PHY 792Research
EEE 792Research
MSE 792Research
EEE 795Continuing Registration
EEE 799Dissertation
Fall 2017
Course NumberCourse Title
EEE 352Properties Electronic Material
EEE 492Honors Directed Study
EEE 493Honors Thesis
EEE 499Individualized Instruction
EEE 590Reading and Conference
EEE 592Research
EEE 595Continuing Registration
EEE 598Special Topics
EEE 599Thesis
EEE 690Reading and Conference
EEE 790Reading and Conference
PHY 792Research
MSE 792Research
EEE 792Research
EEE 795Continuing Registration
EEE 799Dissertation
Summer 2017
Course NumberCourse Title
EEE 590Reading and Conference
EEE 592Research
EEE 595Continuing Registration
EEE 599Thesis
EEE 690Reading and Conference
EEE 790Reading and Conference
EEE 792Research
MSE 792Research
EEE 795Continuing Registration
EEE 799Dissertation
Spring 2017
Course NumberCourse Title
EEE 492Honors Directed Study
EEE 493Honors Thesis
EEE 499Individualized Instruction
EEE 536Semiconductor Characterization
EEE 590Reading and Conference
EEE 592Research
EEE 595Continuing Registration
EEE 599Thesis
EEE 690Reading and Conference
EEE 790Reading and Conference
PHY 792Research
EEE 792Research
MSE 792Research
EEE 795Continuing Registration
EEE 799Dissertation
Fall 2016
Course NumberCourse Title
EEE 352Properties Electronic Material
EEE 492Honors Directed Study
EEE 493Honors Thesis
EEE 499Individualized Instruction
EEE 590Reading and Conference
EEE 592Research
EEE 595Continuing Registration
EEE 599Thesis
EEE 690Reading and Conference
EEE 790Reading and Conference
PHY 792Research
EEE 792Research
MSE 792Research
EEE 795Continuing Registration
EEE 799Dissertation
Summer 2016
Course NumberCourse Title
EEE 499Individualized Instruction
EEE 590Reading and Conference
EEE 592Research
EEE 595Continuing Registration
EEE 599Thesis
EEE 690Reading and Conference
EEE 790Reading and Conference
EEE 792Research
EEE 795Continuing Registration
EEE 799Dissertation
Spring 2016
Course NumberCourse Title
EEE 436Fund of Solid-State Devices
EEE 492Honors Directed Study
EEE 493Honors Thesis
EEE 499Individualized Instruction
EEE 590Reading and Conference
EEE 591Seminar
EEE 592Research
EEE 595Continuing Registration
EEE 599Thesis
EEE 680Practicum
EEE 690Reading and Conference
EEE 790Reading and Conference
PHY 792Research
MSE 792Research
EEE 792Research
EEE 795Continuing Registration
EEE 799Dissertation
Fall 2015
Course NumberCourse Title
EEE 352Properties Electronic Material
EEE 492Honors Directed Study
EEE 493Honors Thesis
EEE 499Individualized Instruction
EEE 590Reading and Conference
EEE 592Research
EEE 595Continuing Registration
EEE 598Special Topics
EEE 599Thesis
EEE 680Practicum
EEE 690Reading and Conference
EEE 790Reading and Conference
PHY 792Research
MSE 792Research
EEE 792Research
EEE 795Continuing Registration
EEE 799Dissertation
Summer 2015
Course NumberCourse Title
EEE 493Honors Thesis
EEE 499Individualized Instruction
EEE 590Reading and Conference
EEE 592Research
EEE 595Continuing Registration
EEE 599Thesis
EEE 680Practicum
EEE 690Reading and Conference
EEE 790Reading and Conference
EEE 792Research
EEE 795Continuing Registration
EEE 799Dissertation
Spring 2015
Course NumberCourse Title
EEE 465Photovoltaic Energy Conversion
EEE 492Honors Directed Study
EEE 493Honors Thesis
EEE 499Individualized Instruction
EEE 590Reading and Conference
EEE 591Seminar
EEE 592Research
EEE 595Continuing Registration
EEE 599Thesis
EEE 680Practicum
EEE 690Reading and Conference
EEE 790Reading and Conference
EEE 792Research
EEE 795Continuing Registration
EEE 799Dissertation
Fall 2014
Course NumberCourse Title
ASU 101-EEEThe ASU Experience
EEE 436Fund of Solid-State Devices
EEE 492Honors Directed Study
EEE 493Honors Thesis
EEE 499Individualized Instruction
EEE 590Reading and Conference
EEE 591Seminar
EEE 592Research
EEE 595Continuing Registration
EEE 598Special Topics
EEE 599Thesis
EEE 680Practicum
EEE 690Reading and Conference
EEE 790Reading and Conference
EEE 792Research
EEE 795Continuing Registration
EEE 799Dissertation
Summer 2014
Course NumberCourse Title
EEE 493Honors Thesis
EEE 499Individualized Instruction
EEE 590Reading and Conference
EEE 592Research
EEE 595Continuing Registration
EEE 599Thesis
EEE 680Practicum
EEE 684Internship
EEE 690Reading and Conference
EEE 790Reading and Conference
EEE 792Research
EEE 795Continuing Registration
EEE 799Dissertation
Spring 2014
Course NumberCourse Title
EEE 498Pro-Seminar
EEE 590Reading and Conference
EEE 591Seminar
EEE 592Research
EEE 595Continuing Registration
EEE 599Thesis
EEE 680Practicum
EEE 690Reading and Conference
EEE 790Reading and Conference
EEE 792Research
EEE 795Continuing Registration
EEE 799Dissertation
Fall 2013
Course NumberCourse Title
EEE 436Fund of Solid-State Devices
EEE 590Reading and Conference
EEE 591Seminar
EEE 592Research
EEE 595Continuing Registration
EEE 599Thesis
EEE 680Practicum
EEE 690Reading and Conference
EEE 790Reading and Conference
EEE 792Research
EEE 795Continuing Registration
EEE 799Dissertation
Summer 2013
Course NumberCourse Title
EEE 590Reading and Conference
EEE 592Research
EEE 595Continuing Registration
EEE 599Thesis
EEE 680Practicum
EEE 690Reading and Conference
EEE 790Reading and Conference
EEE 792Research
EEE 795Continuing Registration
EEE 799Dissertation