Microwave Synthesis and High‐Mobility Charge Transport of Carbon‐Nanotube‐in‐Perovskite Single Crystals

Abstract Organolead trihalide perovskites have emerged as a new class of competitive solution‐processed semiconductors due to their unique optoelectronic properties. However, poor ambient stability and charge transport are the Achilles’ heel of hybrid perovskites, thus limiting their applications. In this work, microwave‐assisted synthesis is applied for the first time to rapidly grow perovskite single crystals embedded with single‐wall carbon nanotubes. These nanotube‐in‐perovskite single crystals are endowed with a carrier mobility one order of magnitude higher than the pure counterpart and the related photodetectors show an ultrafast photo‐response speed (5 and 80 ns for rise and decay time, respectively). The fast and uniform heating of microwave irradiation facilitates the synthesis of ambient‐stable crystals with nanoscale additives, paving the way to creating a wide range of mixed‐dimensional perovskite‐based nanocomposites with optimal properties and device performance.