Owing to enhanced charge transport efficiency arising from the ultrathin nature, two-dimensional (2D) organic semiconductor single crystals (OSSCs) are emerging as a fascinating platform for high-performance organic field-effect transistors (OFETs). However, “coffee-ring” effect induced by an evaporation-induced convective flow near the contact line hinders the large-area growth of 2D OSSCs through a solution process. Here, we develop a new strategy of suppressing the “coffee-ring” effect by using an organic semiconductor: polymer blend solution. With the high-viscosity polymer in the organic solution, the evaporation-induced flow is remarkably weakened, ensuring the uniform molecule spreading for the 2D growth of the OSSCs. As an example, wafer-scale growth of crystalline film consisting of few-layered 2,7-didecylbenzothienobenzothiophene (C₁₀-BTBT) crystals was successfully accomplished via blade coating. OFETs based on the crystalline film exhibited a maximum hole mobility up to 12.6 cm²·V⁻¹·s⁻¹, along with an average hole mobility as high as 8.2 cm²·V⁻¹·s⁻¹. Our work provides a promising strategy for the large-area growth of 2D OSSCs toward high-performance organic electronics.

由于超薄性质带来的电荷传输效率的提高，二维（2D）有机半导体单晶（OSSC）逐渐成为高性能有机场效应晶体管（OFET）的迷人平台。但是，由蒸发引起的对流在接触线附近的对流引起的“咖啡环”效应阻碍了二维OSSC通过溶液过程的大面积生长。在这里，我们开发了一种通过使用有机半导体：聚合物共混溶液来抑制“咖啡环”效应的新策略。在有机溶液中使用高粘度聚合物时，蒸发诱导的流动显着减弱，从而确保了OSSCs二维生长的均匀分子扩散。例如，由几层的2,7-二癸基苯并噻吩并苯并噻吩（C通过叶片涂覆成功地完成了_10- BTBT）晶体。基于晶体膜的OFET表现出最大的空穴迁移率可达12.6厘米² ·V ^-1 ·S ^-1，随着平均空穴迁移率高达8.2厘米² ·V ^-1 ·^秒-1。我们的工作为2D OSSC向高性能有机电子的大范围发展提供了一个有前途的策略。