Dear research community, could you please share your expertise how to dissolve PM6:Y6 [1:1.2] in chloroform (stirring temperatur, duration, concentration, when to add additive chloronaphthalene) and how to spin coat the solution (rpm, annealing temperature and duration)? I am using described in papers recipes: 16 mg/mL total concentration in chloroform, with stirring at room temperature for 3 hours with 0.5% v/v chloronaphthalene additive (added together with chloroform and 30 min prior to spin coating). Spin coating at 3000 rpm and annealing at 90 C for 10 min. ETL is PDINO, PNDIT-F3N-Br, PFN-Br with Au of Ag electrode. The FF values never exceed 60% (usually 40-50%). Although, Jsc and Voc values are decent: 25 mA/cm2 and 0.84 V, respectively. I suspect poor morphology of the active layer which hinders the charge transport and reduces FF.
Dear Damir Aidarkhanov ,
sometimes the batch of PM6 can also have significant influence regarding the overall performance of the organic solar cell. For instance, in the following research paper we used different types of PM6 and obtained quite different performance, ranging from over 15% to roughly 5%, just depending on the chosen PM6: Article The role of bulk and interfacial morphology in charge genera...
.So maybe this might be one thing to check (ask the supplier or whether other groups/researchers use the same batch).
I hope this helps.
Best regards
Joachim Vollbrecht
Dear Joachim Vollbrecht,
thank you for the answer. So far we tested 2 different PM6 suppliers: Lumtec and 1-Material. Both showed similar performance. Therefore, thought that there might be some differences in solution preparation like stirring rpm, stirring temperature and duration.
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