ИСТИНА

Recently ultrathin (2D) organic electronics became a topic of great interest for research and applied development in pursuit to create superlightweight, transparent, ultraflexible and inexpensive electronic devices based on organic semiconductor films with a thickness of one or more molecular layers. However, luminecent properties of 2D semiconductor single crystals are unknown, despite the fact that they would be useful because of their high structural order. Thiophene-phenlylene materials are promising for organic optoelectronics becase of lucky combination of decent charge-carrier mobility and high lumenescence. Linear conjugated thiophenephenlylene molecules with long alkyl terminal substituents easily form large-area 2D single-crystal monolayers. This work is focused on photoluminescence (PL) properites of 2D samples based on (Dec-P)R2R-BTBT molecules (Fig.1, top). 2D samples were prepared from solution and studied with interference, atomic-force, and confocal PL microscopies. We found polarization anisotropy in PL of (Dec-P)R2R-BTBT monolayers. (Fig. 1, bottom) and thus helped us to identify differently oriented monolayer domains. The PL properties of 2D (Dec-P)R2R-BTBT single crystals are discussed. This work was supperted by Russain Science Foundation (#18-12- 00499)