Publication date: 31st May 2020
Organic solar cells (OSCs) demonstrate rapidly growing power conversion efficiencies (PCE) now reaching >18% for single-junction devices [1]. High OSCs performances were achieved using spin-coating technology for the active film deposition after thorough optimization in terms of blend composition, using processing additives, etc. However, commercialization of organic solar cells requires more straightforward and scalable film deposition technologies. Moreover, novel materials with specific properties are required to enable reliable processing of the films through roll-to-roll solution printing and coating industrial techniques.
Here we present OSCs processed using blade-coating with layer-by-layer deposition of electron donor and electron acceptor materials (LBL). The novel (X-DADAD)n medium bandgap polymer P1 was used as a promising electron donor absorber material, while PC61BM was used as a fullerene-based acceptor.
It has been shown that layer-by-layer fabricated OSCs possess enhanced photovoltaic performance compared to traditional bulk heterojunction solar cells. The current density was improved from 6.9 mA/cm2 to 11.4 mA/cm2 and the efficiency reached 6%. We believe that improved vertical morphology of the active layer is responsible for improved performance of LBL OSCs.
We emphasize that blading is a scalable film deposition technique, while the reached efficiency of 6% is among the best values reported for large-area roll-to-roll coated polymer solar cells. Further optimization is expected to lead to improved efficiencies since the used material combination can potentially deliver PCE of >13%.
This work was supported by the Russian Science Foundation, (project No.18-13-00205)
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