Polaron lifetime enhancement of P3HT thin film under femtosecond laser irradiation and its ultrafast mechanism

•Two types of final ablation morphology were acquired through femtosecond laser processing with different parameters.•Using time-resolved pump-probe system to investigate the mechanisms of femtosecond laser − P3HT ultrafast interaction.•A maximal 2 fold lifetime enhancement of bound polaron pair dissociation was achieved at higher fluences.•A maximal 1.3 fold lifetime improvement of defect trapping was achieved at higher fluences.