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Zachary Holman

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

Zachary Holman is an Assistant 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 Ecole Polytechnique Fédérale de Lausanne in Switzerland. His research group at ASU focuses on new materials, processes, and device designs for high-efficiency silicon solar cells and silicon-based tandem solar cells. He has been named a Moore Inventor Fellow, Trustees of ASU Professor, Fulton Entrepreneurial Professor, and Joseph C. Palais Distinguished Faculty Scholar, and he is 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)

65.   X. Meng, K. Fisher, L. Reinhart, W. Taylor, M. Stuckelberger, Z. Holman, and M. Bertoni, “Lamination of silicon solar cells on curved surfaces and incorporation of polymeric optical films,” (under review).

64.   A. Basiri, X. Chen, J. Bai, P. Amrollahi, J. Carpenter, Z. Holman, C. Wang, and Y. Yao, “Nature-inspired chiral metasurfaces for circular polarization detection and full-Stokes polarimetric measurement,” (under review).

63.   S. Fan, Z. Yu, Y. Sun, W. Weigand, P. Dhingra, M. Kim, R. Hool, E. Ratta, Z. Holman, and M. Lee, “20%-efficient epitaxial GaAsP/Si tandem solar cells,” (under review).

62.   N. Mundhaas, Z. Yu, K. Bush, H.-P. Wang, J. Häusele, S. Kavadiya, M. McGehee, and Z. Holman, “Series resistance measurements of perovskite solar cells using Jsc-Voc measurements,” Sol. RRL 1800378 (2019).

61.   D. Chen, M. Kim, J. Shi, B. Vicari Stefani, Z. Yu, S. Liu, R. Einhaus, S. Wenham, Z. Holman, and B. Hallam, “Defect engineering of p-type silicon heterojunction solar cells fabricated using commercial-grade low-lifetime silicon wafers,” (under review).

60.   A. Atkinson, Y. Bi, P. Firth, O. Alrehaili, P. Westerhoff, and Z. Holman, “Aerosol impaction-driven assembly produces evenly dispersed nanoparticle coating on polymeric water treatment membranes,” (under review).

59.   A. Leilaieoun, A. Onno, S. Manzoor, J. Shi, K. Fisher, Z. Yu, and Z. Holman, “Power losses in the front transparent conductive oxide layer of silicon heterojunction solar cells: Design guide for single-junction and four-terminal tandem applications,” (under review).

58.   Z. Yu, K. Fisher, J. Hyatt, R. Angel, and Z. Holman, “GaAs/silicon PVMirror tandem photovoltaic mini-module with 29.6% efficiency with respect to the outdoor global irradiance,” Prog. Photovoltaics (in press).

57.   C. Zhang, L. Ding, M. Boccard, T. Nærland, N. Faleev, S. Bowden, M. Bertoni, C. Honsberg, and Z. Holman, “Silicon nitride barrier layers mitigate minority-carrier lifetime degradation in silicon wafers during simulated MBE growth of III–V layers,” IEEE J. Photovoltaics 9, 431–436 (2019).

56.   B. Chen*, Z. Yu*, K. Liu*, X. Zheng, Y. Liu, J. Shi, D. Spronk, Z. Holman, and J. Huang, “Grain engineering for perovskite/silicon monolithic tandem solar cells with efficiency of 25.4%,” Joule 3, 1–14 (2019). * Denotes co-first author.

55.   K. Bush, S. Manzoor, K. Frohna, Z. Yu, J. Raiford, A. Palmstrom, H.-P. Wang, R. Prasanna, S. Bent, Z. Holman, and M. McGehee, “Minimizing current and voltage losses to reach 25%-efficient monolithic two-terminal perovskite-silicon tandem solar cells,” ACS Energy Lett. 3, 2173–2180 (2018).        

54.   S. Manzoor, J. Häusele, K. Bush, A. Palmstrom, J. Carpenter, Z. Yu, S. Bent, M. McGehee, and Z. Holman, “Optical modeling of wide-bandgap perovskite and perovskite/silicon tandem solar cells using complex refractive indices for arbitrary-bandgap perovskite absorbers,” Opt. Express 26, 27441–27460 (2018). 

53.   C. Sun, D. Chen, W. Weigand, R. Basnet, S. Pheng Phang, B. Hallam, Z. Holman, and D. Macdonald, “Complete regeneration of BO-related defects in n-type upgraded metallurgical-grade Czochralski-grown silicon heterojunction solar cells,” Appl. Phys. Lett. 113, 152105 (2018).                

52.   Z. Yu, J. Carpenter, and Z. Holman, “Techno-economic viability of silicon-based tandem photovoltaic modules in the United States,” Nature Energy 3, 747–753 (2018).                    

51.   P. Firth and Z. Holman, “Aerosol impaction-driven assembly system for production of uniform nanoparticle thin films with independently tunable thickness and porosity,” ACS Appl. Nano Mater. 1, 4351–4357 (2018).      

50.   S. Husein, M. Stuckelberger, B. West, L. Ding, F. Dauzou, M. Morales-Masis, M. Duchamp, Z. Holman, and M. Bertoni, “Carrier scattering mechanisms limiting mobility in hydrogen-doped indium oxide,” J. Appl. Phys. 123, 245102 (2018). [Editor’s Pick]      

49.    D. Swanson, C. Reich, A. Abbas, T. Shimpi, H. Liu, F. Ponce, J. Walls, Y.-H. Zhang, W. Metzger, W. Sampath, and Z. Holman, “CdCl2 passivation of polycrystalline CdMgTe and CdZnTe absorbers for tandem photovoltaic cells,” J. Appl. Phys. 123, 203101 (2018). [Editor’s Pick]   

48.   B. Hallam, D. Chen, J. Shi, R. Einhaus, Z. Holman, and S. Wenham, “Pre-fabrication gettering and hydrogenation treatments for silicon heterojunction solar cells: A possible path to >700 mV open-circuit voltages using low-lifetime commercial-grade p-type Czochralski silicon,” Sol. RRL 1700221 (2018).

47.   K. Bush, N. Rolston, A. Gold-Parker, S. Manzoor, J. Hausele, Z. Yu, J. Raiford, R. Cheacharoen, Z. Holman, M. Toney, R. Dauskardt, and M. McGehee, “Controlling thin film stress and wrinkling during perovskite film formation,” ACS Energy Lett. 3, 1225–1232 (2018).

46.   J. Becker, C. Campbell, Y. Zhao, M. Lassise, X.-H. Zhao, M. Boccard, Z. Holman, and Y.-H. Zhang, “Monocrystalline 1.7-eV-bandgap MgCdTe solar cell with 11.2% efficiency,” IEEE J. Photovoltaics 8, 581–586 (2018).

45.   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).

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.   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).

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).

Research Activity

03/2019–02/2024    NSF CAREER, “CAREER: Transparent, passivating, and carrier-selective heterojunction contacts for silicon and cadmium telluride solar cells,” (PI)

01/2019–12/2021    DOE SETO, “Diagnosing and overcoming recombination and resistive losses in non-silicon solar cells using a silicon-inspired characterization platform,” (PI)

01/2019–12/2021    DOE SETO, “Bringing high-efficiency silicon solar cells with heterojunction contacts to market with a new, versatile deposition technique,” (PI)

01/2019–06/2020    DOE SETO, “Wide-bandgap polycrystalline III-Vs as transparent, carrier-selective heterojunction contacts for silicon photovoltaics,” (Co-PI)

01/2019–12/2020    NREL, “ASU-NREL joint silicon solar cell research: passivated contacts, metallization, and bulk defects,” (PI)

01/2019–12/2021    ARPA-E DAYS, “Solid state thermal battery,” (Co-PI)

10/2018–09/2020    Fulton Entrepreneurial Professors Program, “Aerosol impaction-driven assembly of functional nanomaterial coatings,” (PI)

10/2018–09/2021    Moore Foundation Inventor Fellowship, “Aerosol impaction-driven assembly of functional nanomaterial coatings,” (PI)

10/2018–09/2019    FSE/CLAS/AMI Seed, “Diamond and III-nitride integration for ultra-gap devices (PI)

06/2018–05/2019    NSF SBIR, “Non-thermal plasma source for functional metal-oxide nanoparticle coatings,” (Co-PI)

02/2018–09/2018    NREL, “PERC and SHJ silicon solar modules with high infrared reflectance,” (Co-PI)

01/2018–01/2021    ARENA, “Hydrogenated and hybrid heterojunction p-type silicon PV cells R&D project,” (Co-PI)

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)

08/2017–01/2019    ACAP, “P-type hybrid heterojunction solar cells,” (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)

08/2015–07/2020    NSF ERC, “Nano-Enabled Water Treatment: NEWT,” (Co-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)

Summer 2019
Course NumberCourse Title
EEE 590Reading and Conference
EEE 592Research
EEE 595Continuing Registration
MSE 595Continuing Registration
EEE 599Thesis
EEE 690Reading and Conference
EEE 790Reading and Conference
MSE 792Research
EEE 792Research
EEE 795Continuing Registration
EEE 799Dissertation
Summer 2018
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 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
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
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
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