14 March 2016 Calibration standards and measurement accuracy of absolute electroluminescence and internal properties in multi-junction and arrayed solar cells
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Abstract
We developed methodologies and calibration standards for absolute electroluminescence (EL) measurements for CONTACT-LESS evaluation of various internal properties of multi-junction and arrayed solar cells, such as open-circuit voltages, external and internal radiative efficiencies, and luminescence-coupling efficiency. Several independent calibration methods were compared that used: 1) a calibrated EL imaging system, 2) proximity measurement with a large-area photodiode, 3) an integrating-sphere system, and 4) planar light-emitting diodes with a circular aperture. The comparison clarified the advantages and disadvantages of each method, and showed consistency within 30% uncertainty, resulting in a 7-meV uncertainty in open-circuit voltage measurements.
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Masahiro Yoshita, Lin Zhu, Changsu Kim, Toshimitsu Mochizuki, Tetsuya Nakamura, Mitsuru Imaizumi, Shaoqiang Chen, Hidehiro Kubota, Yoshihiko Kanemitsu, Hidefumi Akiyama, "Calibration standards and measurement accuracy of absolute electroluminescence and internal properties in multi-junction and arrayed solar cells", Proc. SPIE 9743, Physics, Simulation, and Photonic Engineering of Photovoltaic Devices V, 97430D (14 March 2016); doi: 10.1117/12.2211726; https://doi.org/10.1117/12.2211726
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