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

Abstract

Abstract 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 (μ) 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 × 106, responsivity (R) of 3.18 × 104 A W−1, and specific detectivity (D*) of 9.22 × 1014 Jones. This work provides a guide for the designing and patterning of high‐throughput OPTs toward multifunctional integrated optoelectronics.

Keywords

• capillary bridges
• microwire arrays
• organic phototransistors
• organic single crystals