A Colloidal-Quantum-Dot-Based Self-Charging System via the Near-Infrared Band

作者：Baek Se Woong; Cho Jungmin; Kim Joo Seong; Kim Changjo; Na Kwangmin; Lee Sang Hoon; Jun Sunhong; Song Jung Hoon; Jeong Sohee; Choi Jang Wook; Lee Jung Yong

来源：Advanced Materials, 2018, 30(25): 1707224.

DOI：10.1002/adma.201707224

• colloidal quantum dots
• flexible Li-ion batteries
• near-infrared (NIR)
• photostability
• wearable electronics

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.

• 出版日期2018-6-20
• 单位西北大学