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    Intrinsically Stretchable Organic Solar Cells without Cracks under 40% Strain

    Year: 2023

    Journal: Advanced Energy Materials, Volume 13, 2023, page 2300533

    Authors: Lee, Seungbok; Jeon, Yeonjee; Lee, Sang Yeon; Ma, Boo Soo; Song, Myoung; Jeong, Dahyun; Jo, Jihwan; Kim, Geon-U; Lee, Jinho; Kim, Taek-Soo; Kim, Bumjoon J.; Lee, Jung-Yong

    Keywords: adhesion; crack retardation and propagation; crack-free; cross-linking; intrinsically stretchable solar cells; stretchable electrodes

    Intrinsically stretchable organic solar cells (IS-OSCs) have been recently spotlighted for their omnidirectional stretchability, seamless integrability to any surface, and facile fabrication. Due to these attributes, IS-OSCs are ideal off-grid power sources, especially for wearable electronics in real-life. However, under human body elongation as high as ≈40%, cracks in IS-OSCs are considered inevitable, and the origin of the mechanical failure is rarely identified. Herein, the crack-initiation and the propagation mechanism are first clarified. Based on this, a crack-free substrate/transparent electrode platform for stretchable electronics is also suggested. A double-locking scheme, which reinforces the physical/chemical adsorption within the most mechanically fragile layer, a poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) and also with thermoplastic polyurethane substrate, is introduced. As a result, the crack-onset strain of double-locked IS-OSCs surpasses 40%, while that of pristine ones is less than 20%. The IS-OSCs with the double-locked system exhibits an efficient power conversion efficiency of 10.2%, and the absence of cracks allows the IS-OSCs to maintain 79.7% of the initial PCE at 40% strain.
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