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2,7-Didecylbenzothieno-benzothiophene (C10-BTBT) was centrosymmetric and had a BTBT core with one C10 alkyl chain on each end. In the ab plane, C10-BTBT showed a typical herringbone (HB) packing, in which a 2D network of interactions (short contacts of S…S, S…C, and C–H…π) appeared. Along the c-axis, van der Waals (vdW) interactions existed between long alkyl chains. Zhang et al. use C10-BTBT as an example; high-quality 2D C10-BTBT crystals on a centimeter scale are generated by directionally controlling the spreading of organic solution on the water surface with external force. Furthermore, devices with excellent bending stability are achieved by transferring the C10-BTBT two-dimensional (2D) organic single crystals (2DOSCs) to flexible substrates[1-2].

[1] Jinwen Wang. “External-force-driven solution epitaxy of large-area 2D organic single crystals for high-performance field-effect transistors.” Nano Research 12 11 (2019): 2796–2801.
[2] Jiarong Yao (. “Impact of surface free energy on two-dimensional crystallization.” Science China Materials 66 4 (2022): 1511–1517.