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Influence of V2O5 on the properties and electrochromic behavior of regioregular and regiorandom P3HT
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DOI：10.1016/j.synthmet.2026.118164.png)
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Abstract
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Compared with regiorandom poly(3-hexylthiophene-2,5-diyl) (P3HT-RDM), regioregular P3HT (P3HT-RR) exhibits a higher degree of molecular ordering as well as better optical and electrical properties. However, the preparation method of P3HT-RDM is simpler and therefore more economical. In this work, the effect of incorporating V2O5 microparticles (MPs) in the in-situ synthesis of P3HT-RR and P3HT-RDM is studied. P3HT-RR was synthesized using the Grignard Metathesis method (GRIM), while P3HT-RDM was synthesized using the chemical oxidation method (Sugimoto method). V2O5 Mps were obtained by the chemical bath deposition method. The synthesized composites were characterized by X-ray, FTIR, UV-Vis, SEM, AFM, and cyclic voltammetry. Incorporation of V2O5 into P3HT-RR and P3HT-RDM was confirmed, and the type of interaction between the two composite materials was determined. According to the XRD results, the incorporation of V2O5 in P3HT-RDM increased the crystallinity of the P3HT-RDM/V2O5 composites, on the contrary, in the case of incorporating V2O5 in P3HT-RR a decrease in the crystallinity of the P3HT-RR/V2O5 composites was observed. On the other hand, the P3HT-RDM/V2O5 composites showed a decrease in the band gap compared to P3HT-RDM, while the P3HT-RR/V2O5 composites showed an increase in the band gap compared to P3HT-RR. The synthesized materials were tested in single electrochromic devices, determining the benefit of V2O5 incorporation in P3HT-RR and P3HT-RDM on optical contrast, color change time and stability. The new P3HT-RR/V2O5 and P3HT-RDM/V2O5 composites obtained in this work present optoelectronic properties suitable for being applied in different optoelectronic devices.
Keywords:
Oxide Vanadium
Poly(3-hexylthiophene-2 5-diyl)
Composites
Electrochromic Device
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