The impacts of solvent and thermal annealing on the mobility and photogeneration efficiency of free charge carriers in regioregular poly(3-hexylthiophene) were investigated by flash-photolysis time-resolved microwave conductivity measurements, transient absorption spectroscopy of the perylenediimide radical anion, and photocurrent measurements of a comb-type interdigi-tated electrode. A respectable high mobility of 0.62 cm~2 V~(-1) s~(-1) was found as a three-dimensional value, highlighting the unprecedented electronic nature of the conjugated polymer.
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