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Evolution of UV-vis spectra of P3HT aging time with and without 10 min sonication in (a), (b) chloroform and in (c), (d) 1,2-dichlorobenzene, respectively. (e) shows the spectra of a sample under 30 min sonication time in 1,2-dichlorobenzene with various aging times. The corresponding aggregate fraction in different solvents under various sonication conditions is plotted in (f) as a function of aging time.
