Toa Song

Tao Song

Researcher III-Electrical Engineering


Tao Song is a research scientist in NREL's Photovoltaic (PV) Cell and Module Performance Group and has led cell performance calibrations since 2018. He received his doctorate in physics from Colorado State University in 2016, with a research focus on device characterization and simulation of thin-film cadmium telluride (CdTe) and copper indium gallium selenide (CIGS) solar cells. Then, he joined NREL as a postdoctoral researcher for 1.5 years before his promotion to staff scientist. His research interest covers the high-precision efficiency calibration of any kind of solar cells and the development of reliable measurement techniques for novel PV devices.


Ph.D., Physics, Colorado State University

M.S., Physics, Colorado State University

B.S., Optoelectronic Science and Technology, Beijing Jiaotong University 

Professional Experience

Chair, ASTM International Standard Committee on Photovoltaic Electric Power Conversion (2020–present) 
Member, International Electrotechnical Commission Technical Committee on Photovoltaics (2019–present) 

Featured Work

Comprehensive Performance Calibration Guidance for Perovskites and Other Emerging Solar CellsAdvanced Energy Materials (2021)

Six-junction III–V Solar cells with 47.1% Conversion Efficiency under 143 Suns Concentration, Nature Energy (2020)

Te Layer to Reduce CdTe Back-Contact Barrier, IEEE Journal of Photovoltaics (2018)

Emitter/Absorber Interface of CdTe Solar Cells, Journal of Applied Physics (2016)

Accurate Efficiency Measurements for Emerging PV: A Comparison of NREL's Steady-State Performance Calibration Protocol Between Conventional and Conventional and Emerging PV Technologies, IEEE Photovoltaic Specialists Conference (2019) 

Awards and Honors

NREL President’s Award (2020)

MRS-Spring Tutoring Award (2017)

IEEE Photovoltaic Specialists Conference Best Paper Finalist (2015)