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A Colloidal‐Quantum‐Dot‐Based Self‐Charging System via the Near‐Infrared Band
Author(s) -
Baek SeWoong,
Cho Jungmin,
Kim JooSeong,
Kim Changjo,
Na Kwangmin,
Lee SangHoon,
Jun Sunhong,
Song Jung Hoon,
Jeong Sohee,
Choi Jang Wook,
Lee JungYong
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201707224
Subject(s) - materials science , quantum dot , optoelectronics , near infrared spectroscopy , photovoltaics , battery (electricity) , nanotechnology , photovoltaic system , electronics , wearable computer , power (physics) , electrical engineering , optics , computer science , physics , embedded system , engineering , quantum mechanics
A novel self‐charging platform is proposed using colloidal‐quantum‐dot (CQD) photovoltaics (PVs) via the near‐infrared (NIR) band for low‐power electronics. Low‐bandgap CQDs can convert invisible NIR light sources to electrical energy more efficiently than wider spectra because of reduced thermalization loss. This energy‐conversion strategy via NIR photons ensures an enhanced photostability of the CQD devices. Furthermore, the NIR wireless charging system can be concealed using various colored and NIR‐transparent fabric or films, providing aesthetic freedom. Finally, an NIR‐driven wireless charging system is demonstrated for a wearable healthcare bracelet by integrating a CQD PVs receiver with a flexible lithium‐ion battery and entirely embedding them into a flexible strap, enabling permanent self‐charging without detachment.