Facile Patterning of Organic Single‐Crystalline Microwire Array for Mode‐Tunable Microlasers and Photodetectors

Abstract

AbstractThe modulation of organic single‐crystalline micropatterns with ordered alignment and effective output is of great significance to integrated photonic devices as well as optoelectronics. However, it remains an intractable challenge to precisely regulate the crystalline morphology toward specific micropatterns with tunable size, controlled position, and uniform orientation. Here, a combination method with template‐confined self‐assembly and femtosecond laser processing is proposed for the fabrication of large‐scale 1D single‐crystal microwire arrays as high‐quality microlasers and photodetectors. Specifically, the precursor solution of organic semiconductors confined in predefined polydimethylsiloxane template tends to uniaxially crystallize under the guidance of prepatterned linear microchannels, producing highly crystalline and aligned 1D microwire array. Photodetectors based on the 1D microwire array show sensitive and fast responsivity toward 450 nm illumination. Furthermore, the continuous microwire array can be engineered to a series of crystal subunits with tunable lengths through femtosecond laser processing technique. Each microwire subunit can act as a Fabry–Pérot (FP) microcavity resonator for the generation of stable and high‐quality organic laser. This work provides new ideas to obtain highly aligned and size‐controlled microwire arrays based on organic single‐crystalline semiconductors, which contributes to the potential applications in integrated organic lasers and optoelectronics.