期刊
ADVANCED MATERIALS
卷 34, 期 50, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202207544
关键词
flexible spacers; hydrogen bonding; intrinsically stretchable organic solar cells; mechanical robustness; stretchability
类别
资金
- National Research Foundation of Korea [NRF-2020R1A4A1018516, 2021M3H4A1A01004332, 2022R1A2B5B03001761]
- National Research Foundation of Korea [2022R1A2B5B03001761, 2021M3H4A1A01004332] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
A series of new polymer donors (P(D)s, PhAmX), featuring a flexible spacer (PhAm-FS) based on phenyl amide, were developed to enhance the efficiency and stretchability of intrinsically stretchable organic solar cells (IS-OSCs).
Intrinsically stretchable organic solar cells (IS-OSCs), consisting of all stretchable layers, are attracting significant attention as a future power source for wearable electronics. However, most of the efficient active layers for OSCs are mechanically brittle due to their rigid molecular structures designed for high electrical and optical properties. Here, a series of new polymer donors (P(D)s, PhAmX) featuring phenyl amide (N-1,N-3-bis((5-bromothiophen-2-yl)methyl)isophthalamide, PhAm)-based flexible spacer (FS) inducing hydrogen-bonding (H-bonding) interactions is developed. These P(D)s enable IS-OSCs with a high power conversion efficiency (PCE) of 12.73% and excellent stretchability (PCE retention of >80% of the initial value at 32% strain), representing the best performances among the reported IS-OSCs to date. The incorporation of PhAm-based FS enhances the molecular ordering of P(D)s as well as their interactions with a Y7 acceptor, enhancing the mechanical stretchability and electrical properties simultaneously. It is also found that in rigid OSCs, the PhAm5:Y7 blend achieves a much higher PCE of 17.5% compared to that of the reference PM6:Y7 blend. The impact of the PhAm-FS linker on the mechanical and photovoltaic properties of OSCs is thoroughly investigated.
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