Microfluidic solution-processed organic and perovskite nanowires fabricated for field-effect transistors and photodetectors

Solution-processed semiconductor nanowires are attractive for application in low-cost and high-performance electronic devices. However, current approaches for nanowire preparation face the problems of having low-throughput and poor controllability of the dimension and location of nanowires. Here we report a simple yet efficient method to implement solution-processable semiconductor nanowires using microfluidics. The method enables fabrication of semiconductor nanowires with high uniformity and well-defined sizes, as well as precise control of their location and alignment in device assembly. Moreover, this method is found to be applicable to various semiconductors, including organic semiconductors (OSCs) and metal-halide perovskites. Furthermore, we have shown the feasibility of employing these semiconductor nanowires to construct different types of devices like field-effect transistors (FETs) and photodetectors (PDs). In particular, lateral heterojunctions consisting of perovskite/OSC nanowires were obtained by this method, based on which high-performance phototransistors were achieved. Overall, the demonstrated method provides a promising route to the fabrication and application of nanowire-based devices.