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Implantable medical devices are wished to be recharged via contactless power transfer technologies without interventional operations. Superior to subcutaneous power supply by visible light or electromagnetic wave, second near-infrared (NIR-II) light is predicted to possess 60 times subcutaneous power transmission but hard to be utilized. Here we report a photo-thermal-electric converter via the combination of photothermal conversion and thermoelectric conversion. It is able to generate an output power as high as 195 mW under the coverage of excised tissues, presenting advantages of non-invasion, high output power, negligible biological damage, and deep tissue penetration. As an in vivo demonstration, the output power of a packaged converter in the abdominal cavity of a rabbit reaches 20 mW under NIR-II light irradiation through the rabbit skin with a thickness of 8.5 mm. This value is high enough to recharge an implanted high-power-consumption wireless camera and transfer video signal out of body in real-time.

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Despite possessing higher tissue transmittance and maximum permissible exposure power density for skins relative to other electromagnetic waves, second near‐infrared light (1000∼1350 nm) is scarcely applicable to subcutaneous photoelectric conversion, owing to the companion of photothermal effect. Here, a 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 the skin hyperthermia. In vivo, the output power can be higher than 500 mW with a photoelectric conversion efficiency as 9.4%. This output power is promising to recharge all the clinically applied implantable devices via wireless power transmission, e.g. clinical pacemakers (6∼200 μW), drug pump (0.5∼2 mW), cochlear (5∼40 mW), and wireless endo‐photo cameras (∼100 mW).This article is protected by copyright. All rights reserved