High-Performance Organic Phototransistors Based on Single-Crystalline Microwire Arrays

High-performance organic phototransistors (OPTs) have attracted considerable attention owing to their high photoresponse and low-cost solution-processing manufacturing. To meet the increasing demand for integrated optoelectronic circuits, organic single-crystalline micro-/nanowire arrays for OPTs construction are prominently anticipated. However, the manufacturing and patterning of organic single-crystalline arrays have hit a bottleneck due to the uncontrollable dewetting dynamics. In this work, a capillary-bridge lithography strategy is proposed to guide ordered nucleation and unidirectional dewetting of microfluid, thus enabling the large-scale preparation of highly aligned organic single-crystalline microwire arrays. Taking advantage of efficient carrier transport, a competitive average field-effect hole mobility (mu) of 6.64 cm2 V-1 s-1 is obtained, and the high-throughput one-dimensional (1D) arrays based OPTs also exhibit excellent optoelectrical performance with photosensitivity (P) of 1.36 x 106, responsivity (R) of 3.18 x 104 A W-1, and specific detectivity (D*) of 9.22 x 1014 Jones. This work provides a guide for the designing and patterning of high-throughput OPTs toward multifunctional integrated optoelectronics. Organic single-crystalline microwire arrays with highly aligned, controlled position, and high crystallinity are realized by the capillary-bridge lithography strategy. The high-quality microarrays exhibit high average field-effect hole mobility up to 6.64 cm2 V-1 s-1. Microarray-based phototransistors show excellent performance with a responsivity of 3.18 x 104 A W-1 and a specific detectivity of 9.22 x 1014 Jones. image