Effect of alkoxy side chains on intra and interchain exciton coupling in PPE-PPV copolymers solution

Guesmi, M.; Fredj, A. Ben; Romdhane, S.; Bouguerra, N.; Egbe, Daniel Ayuk Mbi; Lang, Reinhold W.; Havlíček, Marek; Sariçiftçi, Niyazi Serdar; Bouchriha, H.

doi:10.1016/j.synthmet.2016.12.026

Cited by 7 publications

(1 citation statement)

References 35 publications

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“…The result was related to an increase in conjugated length of the neat RR PHT chains by ultrasonicating the solutions . Similarly, ultrasonicated RR PHT/PS (1:7) blend solutions, as a control system, showed absorption peaks at λ 2 = 566 and λ 3 = 615 nm, which tended to be slightly blueshifted with an increase in t sonic , as reported in literature (Figure a,b) . For the ultrasound‐assisted neat RR PHT and RR PHT/PS films, the intensities of the absorption peaks at λ 2 and λ 3 increased significantly in comparison to those of the pristine spun‐cast films (Figure d,e) …”

Section: Resultssupporting

confidence: 79%

Spontaneous Phase Separation of Poly(3‐hexylthiophene)s with Different Regioregularity for a Stretchable Semiconducting Film

Gao

Pei

Choi

et al. 2019

Adv Funct Materials

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Highly regioregular (RR) poly(3-hexylthiophene)s PHTs are known to exhibit excellent electrical properties in comparison to chemically identical but regiorandom (rr) PHTs. In this study, distinct RR (97% and 55%)-graded PHTs are subjected to solution blending to spontaneously separate the high-RR PHT chains from the low-RR PHT media and develop highly conjugated nanodomains in both solution and film. In the spun-cast blend films, the rr PHT matrix imparts sufficient deformability of the channel layer required for stretchable organic thin-film transistors (OTFTs), compared to neat RR PHTs and blends with a deformable polymer. OTFTs including RR PHT/rr PHT blend films show excellent hole mobility (µ) values up to 0.13 cm 2 V −1 s −1 , surpassing that of the best RR PHT films (0.026 cm 2 V −1 s −1 ) fabricated by ultrasound solution pretreatment. Furthermore, a 50% stretched RR PHT/rr PHT film maintains ≈55% of its µ value at no strain, while RR PHT films show a sudden decrease in µ even at 10% stretch. The simple blending approach imparts deformability to π-conjugated polymer films for application in stretchable OTFTs.

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Section: Resultssupporting

confidence: 79%