Presentation Details
| Suns–VOC analysis of series resistance in a laser power converter under high laser irradiation Sho Aonuki1, Takaya Oshimo2, Kotona Tabata2, Takeru Yamada2, Junichi Suzuki3, Reo Aoyama3, Shiro Uchida3, Kouichi Akahane4, Masato Suzuki1, Natsuha Ochiai1, Yukiko Suzuki1, Yuka Oshima1, Kensuke Nishioka2, Masakazu Arai2, Yohei Toriumi1, Madoka Takahashi1. 1Space Environment and Energy Laboratories, NTT, Inc., Musashino, Tokyo, Japan.2University of Miyazaki, Miyazaki, Miyazaki, Japan.3Chiba Institute of Technology, Narashino, Chiba, Japan.4National Institute of Information and Communications Technology, Koganei, Tokyo, Japan |
Abstract
We evaluated the series resistance (RS) of an InGaAsP laser power converter (LPC) under 1064-nm laser irradiation using the suns–VOC method. To obtain the suns–VOC curve of a single-junction InGaAsP LPC with an active area of 1 cm2, the open-circuit voltage (VOC) was measured while varying the laser irradiance up to 4.0 W·cm−2. The short-circuit current density (JSC) increased linearly with the laser irradiance, indicating that the suns–VOC method is applicable within this intensity range. We generalized the implied-current-density formulation of the suns–VOC method to arbitrary irradiance conditions and successfully extracted the suns–VOC curve at an incident irradiance of 4.0 W·cm−2. Based on this curve, the RS determined by the suns–VOC analysis was 17.3 mΩ·cm2. This value was compared with the RS obtained by fitting illuminated J–V curves under the same laser intensity, which yielded 13.3 mΩ·cm2. To the best of our knowledge, this study presents the first demonstration of determining the RS of InGaAsP LPCs using the suns–VOC method under high-intensity laser illumination. The proposed approach offers a valuable diagnostic tool for optimizing the electrical performance of LPCs in high-flux optical energy transmission systems. The generalized suns–VOC approach demonstrated here provides a versatile framework for evaluating resistive losses in photovoltaic and optoelectronic devices operating under extreme or non-standard illumination conditions, supporting the design and optimization of next-generation high-flux energy conversion systems.
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