Journal
ADVANCED MATERIALS
Volume 30, Issue 26, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201800075
Keywords
all-solution-processing; flexible organic solar cells; ITO-free; low-temperature
Categories
Funding
- CAS Interdisciplinary Innovation Team, CAS Key Project of Frontier Science Research [QYZDB-SSW-SYS030]
- National Key R&D Program of China [2016YFB0401000, 2017YFE0106000]
- CAS Key Project of International Cooperation [174433KYSB20160065]
- Zhejiang Provincial Natural Science Foundation of China [LR16B040002]
- National Natural Science Foundation of China [21574144, 51773212, 21674123]
- Ningbo Municipal Science and Technology Innovative Research Team [2015B11002, 2016B10005]
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All-solution-processing at low temperatures is important and desirable for making printed photovoltaic devices and also offers the possibility of a safe and cost-effective fabrication environment for the devices. Herein, an all-solution-processed flexible organic solar cell (OSC) using poly(3,4-ethylenedioxythiophene):poly-(styrenesulfonate) electrodes is reported. The all-solution-processed flexible devices yield the highest power conversion efficiency of 10.12% with high fill factor of over 70%, which is the highest value for metal-oxide-free flexible OSCs reported so far. The enhanced performance is attributed to the newly developed gentle acid treatment at room temperature that enables a high-performance PEDOT:PSS/plastic underlying substrate with a matched work function (approximate to 4.91 eV), and the interface engineering that endows the devices with better interface contacts and improved hole mobility. Furthermore, the flexible devices exhibit an excellent mechanical flexibility, as indicated by a high retention (approximate to 94%) of the initial efficiency after 1000 bending cycles. This work provides a simple route to fabricate high-performance all-solution-processed flexible OSCs, which is important for the development of printing, blading, and roll-to-roll technologies.
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