Abstract
Interaction between femtosecond laser pulses with polymeric thin films induced transient optical annealing of the polymer molecules. Melting of the polymer films took place during the transient annealing process, so that a solid-liquid-solid phase transition process was observed. Ultrafast cooling of the melting polymer produced solidified droplets. Microscopic and spectroscopic characterization revealed that the polymer molecules were rearranged with preferable H-aggregation to reach the lowest formation energy during the melting process. Intermolecular coupling was enhanced due to the modified molecular arrangement. This observation of melting of polymeric semiconductors due to the interaction with femtosecond light pulses is potentially important for better understanding laser-matter interactions and for exploring organic optoelectronic devices through special material processing.
Highlights
Polymeric semiconductors have attracted continuously intense attention in fundamental research and technological applications because of their unique optical and electronic properties and/or advantages [1,2,3]
The melting point depends on the molecular weight and longer chains may be melted at higher temperatures, which is between 215 and 300 ◦ C [17,18]. These performances imply the possible tailoring of the F8BT thin films, structures, or devices by such thermal processing
The melted F8BT molecules did not wet the substrate well, so that they aggregate to form a droplet with a large contact angle
Summary
Polymeric semiconductors have attracted continuously intense attention in fundamental research and technological applications because of their unique optical and electronic properties and/or advantages [1,2,3]. The melting point depends on the molecular weight and longer chains may be melted at higher temperatures, which is between 215 and 300 ◦ C [17,18] These performances imply the possible tailoring of the F8BT thin films, structures, or devices by such thermal processing. A series of nonlinear optical effects may be involved during the interactions [24,25,26,27,28], the laser-pulse-induced thermal process has been the main mechanism for the melting of the polymers. 2019, 11, the transient annealing of the F8BT solid film, so that a sequentially solid-liquid-solid phase transition process was observed. Femtosecond laser pulses have been used to accomplish the transient annealing the F8BT solid film, so thatofaF8BT sequentially solid-liquid-solid phase transition annealing of process. Evidence for the new rearrangement of the molecules with enhanced intermolecular interactions
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