Mengjie LI, Ph.D.

Orlando, FL

+1-407-***-**** adl0y6@r.postjobfree.com https://www.linkedin.com/in/mengjie-li-pv/ PROFESSIONAL

Postdoctoral researcher

Department of Materials Science, College of Engineering and Computer Science, University of Central Florida

Aug 2018 – Present, Orlando, FL, USA

- Managing $1.5M United States Department of Energy (DOE) funded project on potential induced degradation (PID) susceptibility in commercial bifacial photovoltaic (PV) modules, expanding the outdoor high voltage testing capability up to 5000V

- Leading field characterization team for $2M DOE funded multi-scale characterization project to gain fundamental understanding of critical failure modes and degradation mechanisms in field-aged photovoltaic modules

- Improved the machine learning model precision from 0.66 to 0.76, recall from 0.62 to 0.78 and f1-score from 0.64 to 0.77 by including synthetic images generated by physics based model for detection and classification of faults in electroluminescence (EL) images of PV modules

- Developed procedure to quantify metal contact induced recombination losses by using intensity dependent photoluminescence (PL) imaging and finite element method (FEM) modelling

- Developed procedure to quantify series resistance loss by using IV curve based analysis and spatially resolved PL/EL images of solar cells and modules

Graduate research associate

Solar Energy Research Institute of Singapore

Aug 2013 – Jan 2018, Singapore

- PhD Thesis: Combined process and device simulations to support BBr3 tube furnace diffusion process optimization for industrial high-efficiency n-type crystalline silicon solar cells

- Developed boron tube furnace diffusion recipe, improved the efficiency of screen printed c-Si n-type front and back contacted (nFAB) cells by 0.6% to reach 20.9%

- Automated dopant diffusion simulation for tube furnace diffusion process using numerical simulation program Sentaurus

- Developed procedure to quantify metallization induced recombination losses in Ag/Al contacted n-type solar cells using intensity dependent photoluminescence (PL) imaging and finite element method (FEM) modelling

- Contributed to development of machine learning framework for industrial high efficiency Si solar cell fabrication process

Visiting graduate research associate

School of Photovoltaic and Renewable Energy Engineering, University of New South Wales Apr 2016 – Dec 2016, Sydney, Australia

- Deployed procedure to quantify metallization induced recombination losses using quasi-steady-state photoluminescence (QSSPL)

EDUCATION

Ph.D. in Electrical and Computer Engineering

Department of Electrical and Computer Engineering, National University of Singapore Aug 2013 – Jan 2018, Singapore

B.E. in Vacuum Electronic Technology

School of Physical Electronics, University of Electronic Science and Technology of China Sep 2009 – Jun 2013, Chengdu, China

RESEARCH FUNDING

2021 - 2023 CO-PI

Funding source / Amount: Dept. of Energy (DOE) $1,500,000 Project Title: Developing PID Susceptibility Models for Bifacial PV Module Technologies Collaborators: National Renewable Energy Laboratory (NREL) Arizona State University (ASU) Appalachia State University First Solar NextEra Energy Orlando Utilities Commission (OUC) Pordis LLC Swinerton 2021 - 2023 FIELD TESTING TEAM LEADER

Funding source / Amount: Dept. of Energy (DOE) $2,000,000 Project Title: Gaining Fundamental Understanding of Critical Failure Modes and Degradation Mechanisms in Fielded Photovoltaic Modules via Multiscale Characterization 2

Collaborators: Case Western Reserve University Bright Spot Automation Tau Science NextEra Energy Orlando Utilities Commission (OUC) SunPower Southern Company Dupont PV Evolution Labs LLC SilFab Solar Inc

2018 - 2021 KEY PERSONNEL

Funding source / Amount: Dept. of Energy (DOE) $1,798.773 Project Title: Characterization of Contact Degradation in c-Si PV Modules Collaborators: Arizona State University (ASU) Bright Spot Automation Tau Science 2019 - 2021 KEY PERSONNEL

Funding source / Amount: Dept. of Energy (DOE) $1,600,000 Project Title: LCOE Reduction Through Proactively Optimized Monitoring of PV Systems Collaborators: NextEra Energy Pordis LLC

SKILLS

EQUIPMENT:

Photoluminescence (PL) imaging Electroluminescence (EL) imaging Quantum efficiency (QE) measurement Current and voltage (IV) measurement Minority carrier lifetime measurement Transmission line measurement

(TLM) 4 point probe measurement (4PP) Fourier-transform infrared spectroscopy (FTIR) Ultraviolet–visible spectroscopy (UV-VIS) Scanning electron microscope (SEM) Ellipsometry Tube furnace diffusion Plasma-enhanced chemical vapor deposition (PECVD) Screen printing SOFTWARE:

Python Griddler PC1D LT-Spice Origin AutoCAD OTHER:

Excellent teamwork/interpersonal skills Excellent written and verbal communication skills Excellent organization and documentation skills Excellent problem solving skills PROFESSIONAL AND COMMITTEE INVOLVEMENT

Mentor: Undergraduate student research (14 students) and Graduate student research (2 students) Peer reviewer: IEEE Journal of Photovoltaics (5), Journal of Applied Physics (1), Physica Status Solidi A: Applications and Materials Science (2), Solar Energy (1), Progress in Energy and Combustion Science (1) Conference abstract reviewer: 48th IEEE Photovoltaic Specialists Conference (PVSC48), 2021 Conference abstract reviewer: 47th IEEE Photovoltaic Specialists Conference (PVSC47), 2020 Funding reviewer: 2020 UCF Seed Funding Program

JOURNAL PAPERS

1. N. Iqbal, M Li, G. Gregory, S. Dahal, S. Bowden, K. O. Davis, “Recombination and Resistive Losses of Transferred Foil Contacts for Silicon Heterojunction Solar Cells”, physica status solidi (RRL) - Rapid Research Letters, vol. 14, issue 11, 2020.

2. K. Ogutman, G. Gregory, M. Li, N. Iqbal, M. Haslinger, S. Robert, E. Cornagliotti, W. Schoenfeld, J. John, K. O. Davis, "Spatial Atomic Layer Deposition of Aluminum Oxide as a Passivating Hole Contact for Silicon Solar Cells" Physica Status Solidi A: Applications and Materials Science, vol. 217, issue 18, 2020. 3. M. Li, N. Iqbal, X. Lin, Z. Yang, K. O. Davis. “A Comprehensive Evaluation of Contact Recombination and Contact Resistivity Losses in Industrial Silicon Solar Cells”. IEEE Journal of Photovoltaics, vol. 10, issue 5, pp.1277-1282, 2020. 4. G. Gregory, M. Li, A. Gabor, A. Anselmo, Z. Yang, H. Ali, N. Iqbal, K. O. Davis, “Nondestructive Contact Resistivity Measurements on Solar Cells Using the Circular Transmission Line Method”, IEEE Journal of Photovoltaics, vol. 9, no. 6, pp. 1800-1805, Nov. 2019.

5. M. J. Hossain, E. J. Schneller, M. Li, K. O. Davis, “Incorporation of spatially-resolved current density measurements with photoluminescence for advanced parameter imaging of solar cells”, Solar Energy Materials and Solar Cells, vol. 199, pp. 136-143, Sep. 2019.

6. M. Li, J. Wong, E. Wang, J. Rodriguez, S. Duttagupta, G. S. Samudra, A. G. Aberle, R. Stangl, “Predictive simulation framework for boron diffused p+ layers optimization: sensitivity analysis on process parameters of tube furnace diffusion of industrial nFAB Si wafer solar cells”, Solar Energy Materials & Solar Cells, vol. 189, pp. 63-74, Jan. 2019. 7. J. Rodriguez, E. Wang, N. Chen, J. Ho, M. Li, J. K. Buatis, B. Nagarajan, L. Xu, W. Choy, V. Shanmugam, J. Wong, A. G. Aberle, S. Duttagupta, “Towards 22% efficient, fully screen-printed, bifacial, n-type solar cells”, Solar Energy Materials & Solar Cells, vol. 187, pp. 91-96, Dec. 2018. 8. M. Li, J. Wong, N. Chen, A. G. Aberle, R. Stangl, “Determination of metallization induced recombination losses of screen printed solar cell contacts and its dependence on the doping profile”, IEEE Journal of Photovoltaics, issue 99, pp. 1-8, Sep. 2018.

9. M. Li, F. Ma, I. M. Peters, K. D. Shetty, A. G. Aberle, B. Hoex, G. S. Samudra, “Numerical simulation of doping process by BBr3 tube diffusion for industrial n-type silicon wafer solar cells”, IEEE Journal of Photovoltaics, vol. 7, issue 3, pp. 755-762, May 2017.

3

CONFERENCE PRESENTATIONS AND PAPERS

1. M. Li, J. Fioresi, N. K. Pannaci, K. O. Davis, “Improving the Accuracy of Pixel-level Defect Classification of Electroluminescence Images Using Synthetic Images”, 48th IEEE Photovoltaic Specialists Conference (PVSC), Miami, FL, 2021.

2. J. Fioresi, D. Colvin, R. Frota, R. Gupta, M. Li, H. Seigneur, S. Vyas, M. Shah, K. O. Davis, “Automated Defect Detection and Localization in Photovoltaic Cells using Semantic Segmentation of Electroluminescence Images”, 48th IEEE Photovoltaic Specialists Conference (PVSC), Miami, FL, 2021. 3. M. Li, M. J. Hossain, C. Weik, N. K. Pannaci, N. Iqbal, D. Colvin, K. O. Davis, “Spatially Resolved Series Resistance Analysis of PV Modules using Electroluminescence and Photoluminescence”, 48th IEEE Photovoltaic Specialists Conference (PVSC), Miami, FL, 2021.

4. M. Li, D. Colvin, M. Gao, A. Gorricho, H. Seigneur, “Impact of Soiling on PV Modules and Strings of Field-Exposed PV Systems”, 48th IEEE Photovoltaic Specialists Conference (PVSC), Miami, FL, 2021. 5. N. Iqbal, M. Li, Mikeska K, Lu M, K. O. Davis, “Impact of Acetic Acid Exposure on the Screen Printed Tellurite-Based Silver Contacts”, 48th IEEE Photovoltaic Specialists Conference (PVSC), Miami, FL, 2021. 6. J. Pivnik, M. Cuesta, M. Li, H. Seigneur, “Spatially Resolved Numerical Simulations of PV Module Failures”, 48th IEEE Photovoltaic Specialists Conference (PVSC), Miami, FL, 2021. 7. N. Iqbal, M. Li, S. Dahal, S. Bowden, K. O. Davis, “Fabrication and Characterization of Novel Metal Contacts for Silicon Heterojunction Solar Cells”. 29th Workshop on Crystalline Silicon Solar Cells and Modules: Materials and Processes, Winter Park, CO, 2019

8. M. Li, N. Iqbal, X. Lin, Z. Yang, K. O. Davis, “Characterization of the Metallization Induced Recombination Losses in Industrial Silicon Solar Cells”, 46th IEEE Photovoltaic Specialists Conference (PVSC), Chicago, USA, 16-21 June 2019. Poster presentation & conference proceeding. 9. P. Wang, M. Huang, J. M. Yacob Ali, R. Sridharan, A. Khanna, M. Li, R. Stangl, “Development of close-to-zero damage rear heterojunction stripe contacts and compatible front metallization approaches for hybrid heterojunction solar cells”, World Conference on Photovoltaic Energy Conversion (WCPEC-7), Waikoloa, Hawaii, 10-15 June, 2018. Poster presentation & conference proceeding.

10. M. Li, F. Ma, R. Stangl, A. G. Aberle, G. S. Samudra, B. Hoex, “Investigation on the Ag-Al metal spiking into boron-diffused p+ layer of industrial bifacial n-type silicon wafer solar cells by numerical simulation” 33rd European Photovoltaic Solar Energy Conference and Exhibition (EUPVSEC), Netherlands, 25-29 September 2017. Oral presentation

& conference proceeding.

11. R. Dumbrell, M. K. Juhl, M. Li, T. Trupke, Z. Hameiri, “Metal induced contact recombination measured by quasi-steady-state photoluminescence”, 44th IEEE Photovoltaic Specialists Conference (PVSC), Washington D.C., USA, 25-30 June 2017. Oral presentation & conference proceeding. 12. M. Li, J. Wong, N. Chen, A. G. Aberle, R. Stangl, “Griddler AI assisted p+ layer optimization towards lower screen printing induced recombination losses for industrially relevant n-type bifacial Si wafer solar cells”, 27th International Photovoltaic Science and Engineering Conference (PVSEC), Japan, 12-17 November 2017. Poster presentation 13. R. Stangl, G. Anand, R. Jaiswal, M. Li, A. Fell, C. Ke, A. G. Aberle, “XSolar-Hetero: Current status of the web-based solar cell simulation platform developed at SERIS”, 27th International Photovoltaic Science and Engineering Conference (PVSEC), Japan, 12-17 November 2017. Oral presentation 14. M. Li, J. Wong, B. Hoex, T. Muller, A. G. Aberle, G. S. Samudra, S. Duttagupta, “Advanced simulation of industrially feasible nBiFAB silicon solar cells with an efficiency potential of more than 22%”, 26th International Photovoltaic Science and Engineering Conference (PVSEC), Singapore, 24-28 October 2016. Oral presentation 15. F. Ma, M. Li, Z. Hameiri, “Advanced evaluation of surface passivation non-uniformity from photoluminescence imaging of un-diffused lifetime samples”, 26th International Photovoltaic Science and Engineering Conference (PVSEC), Singapore, 24-28 October 2016. Poster presentation 16. R. Dumbrell, M. K. Juhl, M. Li, T. Trupke, Z. Hameiri, “Effective lifetime of full rear metallized cells by quasi-steady-state photoluminescence”, 26th International Photovoltaic Science and Engineering Conference (PVSEC), Singapore, 24-28 October 2016. Poster presentation 17. M. Li, B. Hoex, F. Ma, K. D. Shetty, A. G. Aberle, G. S. Samudra, “Modelling and characterization of BBr3 boron diffusion process for n-type silicon wafer solar cells”, 31st European Photovoltaic Solar Energy Conference and Exhibition

(EUPVSEC), Germany, 14-18 September 2015. Poster presentation & conference proceeding. 18. M. Li, F. Ma, B. Hoex, G. S. Samudra, A. G. Aberle, I. M. Peters, “Annealing simulation for ion implanted boron emitters”, PV Asia Scientific Conference (PV-Asia), Singapore, 28-29 October 2014. Poster presentation.

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