Journal
ADVANCED ENERGY MATERIALS
Volume 11, Issue 4, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202003509
Keywords
energy storage; flexible; metal‐ embedded; photocapacitors; solar cells
Categories
Funding
- Basic Science Research Program through the National Research Foundation (NRF) of Korea - Ministry of Science, ICT & Future Planning [NRF- 2017R1A2B2001838]
- Creative Materials Discovery Program through the National Research Foundation (NRF) of Korea - Ministry of Science, ICT & Future Planning [NRF-2017M3D1A1039287]
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A flexible self-charging photocapacitor was developed to provide sustainable energy for wearable devices. By combining flexible organic solar cells and supercapacitors, the performance of the capacitor was improved, achieving a 3.2V charge in 5 minutes.
The popularity of wearable smart electronic gadgets, such as smartphones, smartwatches, and medical sensors, is inhibited by their limited operation lifetime due to the lack of a sustainable self-charging power supply. This constraint can be overcome by developing a flexible, self-charging photocapacitor that can synchronously harvest and store energy. Here, ultrathin, all-printed, and metal-embedded transparent conducting electrodes (ME-TCEs) are designed for the fabrication of large-area, flexible organic solar cells (F-OSCs) and flexible supercapacitors (F-SCs). Stripe-shaped F-OSCs (SF-OSCs) and F-SCs (SF-SCs) are obtained via slitting the as-fabricated F-OSCs and F-SCs with a surgical scalpel, respectively. The SF-OSCs and SF-SCs fully retain their performance after slitting, achieving a power conversion efficiency of approximate to 6.43% and areal capacitance of approximate to 52 mF cm(-2), respectively. Furthermore, photocapacitor fibers are obtained by vertically stacking one SF-OSC and seven SF-SCs. Each fiber is fully encapsulated using UV-curable resin. When woven into a textile, the photocapacitor module (2 series x 4 parallel connections) is able to charge up to a voltage of 3.2 V in 5 min under one-sun illumination. The photoelectric-conversion-and-storage efficiency (eta) of the photocapacitor module is 4.94%. The highly tailorable, mechanically robust photocapacitor demonstrated herein can be a secondary, self-sustainable power supply for futuristic wearable applications.
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