[9p-PB1-1~22] 12.1 Fabrications and Structure Controls

[9p-PB1-1] Structural characterization of co-crystals in polycrystalline films from Ph-BTBT-C_n mixed solutions with different alkyl chains lengths

〇Takayuki Oka¹, Nobutaka Shioya², Takeshi Hasegawa¹ (1.ICR, Kyoto Univ., 2.Kindai Univ.)

Keywords:

Organic semiconductor,Spin-coating,Polymorphism

The high-performance organic semiconductor Ph-BTBT-C_n forms a charge-transport-favorable parallel-type structure upon thermal annealing, but such high-temperature processing can degrade device components. Here, we prepared spin-coated polycrystalline films from a mixed solution of n = 4 and 6, obtaining a parallel-type cocrystal without heating. The structure was determined by IR spectroscopy, X-ray diffraction, 2D-GIXD, and DFT calculations. Charge transfer integrals computed with the ADF program confirmed two-dimensional charge transport, demonstrating the potential of these films for organic transistor applications.