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Study on effect of supercritical CO 2 on structural ordering and charge transporting property in thiophene-based block copolymer
Ist Teil von
Japanese Journal of Applied Physics, 2022-02, Vol.61 (2), p.21001
Erscheinungsjahr
2022
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Abstract
We reported that supercritical (sc) annealing of poly(3-hexylthiophene) (P3HT), and its block copolymers with poly(ethylene oxide) (PEO) and polystyrene (PSt) brought about improvements in the crystal structure and hole mobility, determined by the space charge limited current (SCLC) measurement. P3HT-
b
-PEO showed the largest increase in mobility. From the XRD profile, it was found that the treatment with scCO
2
increased the crystallite size and crystallinity. UV–vis spectra showed that the effective conjugation length in the scCO
2
treated films was increased, compared to the as-spun samples, suggesting that CO
2
molecules are incorporated into domains of the second block domains and P3HT amorphous region, and assist to alter the characteristics of the crystalline region. Then, it was considered that the change in the crystalline structure and the improvement of P3HT chains packing led to enhanced mobility. Since PEO is known to have a higher affinity for CO
2
, the increase of mobility was specifically intensive.