Two-dimensional single-crystalline p-n junctions of organic semiconductors (pn-2DCOSs) show great potential in organic logic circuits due to their single crystal nature and excellent ambipolar charge transport. However, there are only few reports on pn-2DCOSs because it is difficult to obtain such highly ordered structure in pn-junction. Herein, a novel and effective solution processing method of secondary transfer technology based on the facile drop casting is used to fabricate devices of pn-2DCOSs based on C₈-BTBT (p-type) and TFT-CN (n-type) successfully. The high-performance ambipolar field transistors based on such ultrathin pn-2DCOSs with several molecular layers thickness show well-balanced ambipolar charge transport behaviors with hole mobility as high as 0.43 cm² V⁻¹ s⁻¹ and electron mobility up to 0.11 cm² V⁻¹ s⁻¹, respectively. This work is essential for studying the intrinsic properties of organic p-n junctions and achieving high performance in organic complementary circuits.

有机半导体的二维单晶pn结（pn-2DCOS）由于其单晶性质和出色的双极性电荷传输而在有机逻辑电路中显示出巨大的潜力。但是，关于pn-2DCOS的报道很少，因为难以在pn结中获得这种高度有序的结构。在本文中，基于轻熔滴铸的二次转移技术的一种新颖有效的溶液处理方法被用于成功地制造基于C ₈ -BTBT（p型）和TFT-CN（n型）的pn-2DCOSs器件。基于具有几个分子层厚度的这种超薄pn-2DCOS的高性能双极性场效应晶体管显示出良好平衡的双极性电荷传输行为，空穴迁移率高达0.43 cm ² V^-1 s ^-1和电子迁移率分别高达0.11 cm ² V ^-1 s ^-1。这项工作对于研究有机pn结的内在特性并在有机互补电路中实现高性能至关重要。