Dr. Zhu Lin Profile

Dr. Zhu Lin

at Institute for Solid State Physics

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Proceedings Article | 27 February 2019 Paper

Monitoring carrier transport and recombination in photovoltaic devices in real time

Y. Hazama, Y. Ishida, L. Zhu, C. Kim, S. Shin, H. Akiyama

Proceedings Volume 10913, 109130Y (2019) https://doi.org/10.1117/12.2507736

KEYWORDS: Solar cells, Photoemission spectroscopy, Photovoltaics, Solar energy

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Transport and recombination of excess carriers in an InGaAs solar cell are investigated by using time-resolved photoemission spectroscopy. We found that photovoltage rises and decays over 820 ps and 980 ps, respectively, at the pump fluence of 0.16 μJ/cm². This result shows that charge separation and recombination occur in a close time scale while charge separation is substantially faster than recombination in a GaAs solar cell which we studied in the previous study. This implies that the InGaAs cell suffers from higher non-radiative recombination loss. We also analyze the limiting factor of the temporal resolution for the present technique. The temporal resolution can be improved by employing a light source with a higher photon energy while its benefit is not drastic. Alternative methods for the improvement are discussed. In addition, time-resolved photoluminescence spectroscopy was performed in order to compare the two time-resolved techniques. The photoluminescence decay of a GaAs cell shows a fast decay at a weak photo-injection level, which becomes slower at higher injection levels as observed in previous studies.

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