期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 5, 期 48, 页码 25476-25484出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ta09033a
关键词
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资金
- Spanish MINECO (Severo Ochoa program) [SEV-2015-0522]
- MINECO
- Fondo Europeo de Desarrollo Regional FEDER [MAT2014-52985-R]
- Fundacio Privada Cellex
- EC [ICT-2011.35, NMP3-SL-2013-604506]
- Erasmus Mundus doctorate program Europhotonics [159224-1-2009-1-FR-ERA MUNDUS-EMJD]
Sputtered ultrathin silver-based multilayer electrodes have emerged as promising ITO-free candidates for lightweight, roll-to-roll processable flexible organic photovoltaics due to their high conductivity, low parasitic absorption, and excellent mechanical flexibility. However, Ag-based flexible solar cells normally yield inferior device performance when compared to conventional glass/ITO analogues. In this work, we report the use of a two-resonance tapping cavity (TRTC) based transparent electrode for achieving high-performance flexible PBDBT:ITIC solar cells. To reach optimal light harvesting without significantly sacrificing the high open-circuit voltage, the non-fullerene acceptor was partially substituted by PC71BM to transform the binary blend into a ternary blend. The combination of open-circuit voltages as high as 0.88 V with short-circuit currents close to 18 mA cm(-2) leads to power conversion efficiencies higher than 11% for optimal TRTC rigid cells under AM 1.5G 1-sun illumination. Remarkably, when the TRTC was integrated onto flexible PET substrates, a 10.6% efficiency was achieved for the cells, while a robust mechanical flexibility was preserved. This is the highest efficiency value ever achieved for flexible organic solar cells.
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