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Highly Efficient All-polymer Solar Cells Prepared under Meniscus-Assisted-Coating Strategy

Update time:2022-02-15
In recent years, all-polymer solar cells (all-PSCs) are considered to be more likely photovoltaic devices for future applications due to their good mechanical properties and excellent device stability.
Different from the conventional fabrication of solar cell by spin coating (SC) approach, Prof. WANG Jingxia’s team from the Technical Institute of Physics and Chemistry of the Chinese Academy of Sciences (TIPC, CAS) and Prof. HUO Lijun from Beihang University developed a meniscus-assisted-coating (MAC) solution printing strategy.
The strategy is proposed to prepare high-quality blend films with the optimized morphology of the active layer. The efficiency of as-prepared all-PSCs is 15.53% from MAC, which is higher than that of prepared by the SC (14.58%), owing to the more ordered molecular packing and better nanofiber interpenetrating network structure for active layer prepared by MAC.
This work is published in Advanced Materials
In this study, it is found that solution shear rate greatly affects the three-phase contact line geometric shape, material crystallization kinetics and phase separation size, and the crystallinity of active layer material.
Meantime, researchers have extended the MAC method to the preparation of 1×1 cm2 devices with power conversion efficiency (PCE) over 12%. Various active layer films with PCE>15% are also prepared. 
" The development of this work is not only providing a simple and efficient solution printing method for the preparation of all-PSCs, but also giving constructive theoretical guidance according to the different shear rates,” said Prof. WANG.
This work was supported by the National Natural Science Foundation of China, and the International Partnership Program of the Chinese Academy of Sciences.



Figure. Schematic illustration of the mechanism for the film deposition process via the meniscus (Image by WANG group)