Skin Thermal Management for Subcutaneous Photoelectric Conversion Reaching 500 mW

Despite possessing higher tissue transmittance and maximum permissible exposure power density for skin relative to other electromagnetic waves, second near‐infrared light (1000–1350 nm) is scarcely applicable to subcutaneous photoelectric conversion, owing to the companion photothermal effect. Here,...

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Bibliographic Details
Published in:Advanced materials (Weinheim) 2023-10, Vol.35 (40), p.e2306903-n/a
Main Authors: Lyu, Shanzhi, He, Yonglin, Li, Xinlei, Wang, HaoYi, Yao, Yuge, Peng, Zhimin, Ding, Yanjun, Wang, Yapei
Format: Article
Language:English
Subjects:
Electromagnetic radiation
Hyperthermia
Materials science
photoelectric conversion
Photoelectricity
Photothermal conversion
photothermal toxicity
Photovoltaic cells
second near‐infrared light
subcutaneous power supply
Thermal management
wireless charge
Wireless power transmission
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Summary:Despite possessing higher tissue transmittance and maximum permissible exposure power density for skin relative to other electromagnetic waves, second near‐infrared light (1000–1350 nm) is scarcely applicable to subcutaneous photoelectric conversion, owing to the companion photothermal effect. Here, skin thermal management is conceived to utmostly utilize the photothermal effect of a photovoltaic cell, which not only improves the photoelectric conversion efficiency but also eliminates skin hyperthermia. In vivo, the output power can be higher than 500 mW with a photoelectric conversion efficiency of 9.4%. This output power is promising to recharge all the clinically applied implantable devices via wireless power transmission, that is, clinical pacemakers (6–200 µW), drug pumps (0.5–2 mW), cochlear (5–40 mW), and wireless endo‐photo cameras (≈100 mW). A subcutaneous power supply device utilizing second near‐infrared light is proposed with the synergistic combination of photovoltaic cells and a thermoelectric generator. Skin thermal management is used to turn photothermal toxicity into a favorable factor for photoelectric conversion. In in vivo experiment, its output power can be higher than 500 mW with a photoelectric conversion efficiency of 9.4%.
ISSN:0935-9648
1521-4095
DOI:10.1002/adma.202306903