Fig. 5: TA kinetics and pulsed-EPR analysis.
From: Aggregation promotes charge separation in fullerene-indacenodithiophene dyad
a Dependence of the charge-separated state (CSS, probe at 620 nm) and ground-state bleaching (GSB, probe at 420 nm) kinetics on excitation density for ID dyad film within 5 ns. b Dependence of the CSS kinetics on excitation density for ID dyad film within 10 μs. The slope of the dashed line reflects the CR rate change. c Experimental and simulated pulsed-EPR signal recorded 15 ns after 532 nm excitation of IB aggregate at 5 K; inset: experimental and fitted decay kinetics. d Schematic of the generation of triplet charge-separated state (3CSS) via spin-correlated 1CSS or spin-uncorrelated free carriers (FCs). e, f Dependence of the CSS kinetics on excitation density for IDTT/C60 blend film within 5 ns and 1 μs. The slope of the dashed line in f reflects the CR rate change. g Comparison of the CSS kinetics between ID dyad and IDTT/C60 blend films (19.1 μJ/cm2 excitation) under 410 or 650 nm excitation. h Comparison of the selected TAS between ID dyad and IDTT/C60 blend film within microsecond timescale.
