The effect of incorporating chalcogenophene comonomers, namely, furan, thiophene, and selenophene, on the optoelectrical properties of cyclopentadithiophene-based polymers (P1, P2, and P3, respectively) for organic field-effect transistors is reported. The optical, electrical, and morphological properties of the P1, P2, and P3 are investigated. Compared to the other polymers, the P2 showed the highest crystallinity with the shortest π–π stacking distance (dπ–π ≈ 3.58 Å) and the longest crystalline length (Lc ≈ 40 Å), as confirmed by two-dimensional grazing incidence wide-angle X-ray diffraction. However, P3 had the highest hole mobility (μ = 0.25 cm2/V-s), which is higher than P1 (μ = 0.06 cm2/V-s) and P2 (μ = 0.20 cm2/V-s). The relatively lower mobility of the P2 compared to that of the P3 is attributed to its island-like crystalline domains, confirmed by atomic force microscopy results and the lower edge-on crystallite ratio. Our findings suggest a new design guideline for developing high-mobility π-conjugated polymers.
Bibliographical noteFunding Information:
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education ( 2019R1A6A1A03032988 and 2019R1F1 A1043474 ) and the Ministry of Science and ICT (2019R1C1C1010426 and 2022R1A4A2000835). This research was supported by the BB21plus (grant number: 2022–0123) funded by Busan Metropolitan City and Busan Institute for Talent & Lifelong Education (BIT) ; the authors are thankful for their support.
© 2022 Elsevier B.V.
- Organic field-effect transistors
- Semiconducting polymers