Overview
Personal Profile
Rafell Willliams has worked on test commercial, developmental, and research photovoltaic devices. He performs primary reference cell calibrations to aid NLR’s ability to hold an ISO 17025 accreditation for primary reference cell and secondary module calibration.
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Collaborations and Top Research Areas From the Past 5 Years
Recent external collaboration on country/territory level. Dive into details by clicking on the dots or
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Performance Measurement of Emerging 3- and 4-Terminal Tandem Solar Cells
Song, T., Geisz, J., Senaud, L.-L., Champault, L., Sahli, F., Geissbuhler, J., Salmon, B.-P., Jeangros, Q., Brewer, J., Davis, I., Williams, R., VanSant, K. & Kopidakis, N., 2026, In: EES Solar. 2, 2, p. 381-391 11 p.Research output: Contribution to journal › Article
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Closing the Accuracy Gap in Tandem Photovoltaic Testing: An Accessible and Efficient Spectral Tuning Method Using LED-Based Simulators for Research Laboratories and Industry: Article No. 033005
Song, T., Mack, C., Brewer, J., Geisz, J., Williams, R., Friedman, D. & Kopidakis, N., 2025, In: PRX Energy. 4, 16 p.Research output: Contribution to journal › Article › peer-review
2 Scopus Citations -
Performance Measurement Guidance for Multi-Terminal Tandem Solar Cells
Song, T., Geisz, J., Mack, C., Brewer, J., Williams, R. & Kopidakis, N., 2025, p. 784-786. 3 p.Research output: Contribution to conference › Paper
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Impact of Irradiation-Induced Filter Heating on Calibration of NIR-Longpass-Filtered Reference Solar Cells
Song, T., Williams, R., Ottoson, L., Mack, C., Geisz, J., Brewer, J. & Kopidakis, N., 2023, In: IEEE Journal of Photovoltaics. 13, 6, p. 793-799 7 p.Research output: Contribution to journal › Article › peer-review
4 Scopus Citations -
Improved Primary Reference Cell Calibrations for Higher Accuracy Photovoltaic Cell and Module Performance Measurements: Article No. 2300379
Osterwald, C., Ottoson, L., Williams, R., Mack, C., Brewer, J., Kopidakis, N. & Song, T., 2023, In: Solar RRL. 7, 19, 11 p.Research output: Contribution to journal › Article › peer-review
3 Scopus Citations