Organic photovoltaic cell with 17% efficiency and superior processability for large-area coating

phys.org | 6/12/2019 | Staff
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Organic photovoltaic (OPV) cells have attracted considerable research interest because of advantages of lightweight, flexibility and low-cost solution processing. With the development of organic photoactive materials, especially the new-emerging non-fullerene electron acceptors (NFAs), OPV cells have yielded power conversion efficiencies (PCEs) of over 16% in recent years. However, these devices were usually fabricated with a spin-coating method at small areas below 0.1 cm2 in laboratories, which are not suitable for future upscale productions.

For the spin-coating process, wet films dry rapidly due to the high spinning speed. However, when large-area coating methods, such as blade-coating, slot-die coating, and spraying-coating methods, are used, wet films dry slowly. The significantly decreased volatilization rate of the solvent gives a much longer time for ordered molecular alignment and aggregation, which may lead to the formation of a larger domain size or excessive phase separation in the active layer. Therefore, it's still a challenge to fabricate highly efficient OPV cells via large-area fabrication methods.

Research - Team - Prof - Jian-**** - Hou

Recently, the research team led by Prof. Jian-**** Hou at Institute of Chemistry, Chinese Academy of Sciences, finely optimized the alkyl...
(Excerpt) Read more at: phys.org
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