In Situ Study the Dynamics of Blade‐Coated All‐Polymer Bulk Heterojunction Formation and Impact on Photovoltaic Performance of Solar Cells (original) (raw)

All-polymer solar cells (all-PSCs) have attracted extensive attention due to the thermal and mechanical stability of polymers. [1-5] The limiting factors for all-PSCs are mainly incurred by the small electron mobility of polymer acceptors and strong phase separation upon evaporation of the solvent. [2,6] It is known that the emerging non-fullerene acceptors (NFAs), such as ITIC and Y6, have strong absorption in the near-infrared region and excellent electron-transport properties, which enables power conversion efficiencies (PCEs) of organic solar cells (OSCs) exceeding 19%. [7-10] Recently, novel polymer acceptors have been synthesized by polymerizing NFAs to synergize the merits of NFAs and conjugated polymers. [11-13] The PCEs of all-PSCs employing such polymerized NFAs were promoted to above 16%. [14,15] However, high-efficient all-PSCs are commonly fabricated via spin-coating in inert atmosphere, which is not compatible with upscaling of solar module production. To realize the commercialization of OSCs in the future, continuous largearea-coating techniques like blade-coating or slot-die-coating are required. Nowadays, the performance of OSCs printed in air still lags behind those of OSCs spin-coated in a glove box.

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