In‐Plane Integrating Unidirectional 1D CsPbBr₃ Waveguide Arrays with Heterogeneous Semiconductor Wires for Photonic Integrated Circuits

Abstract 1D semiconductor wires have great potential in on‐chip integrated photonics systems. However, it is still challenging to efficiently integrate various semiconductor wires on a large scale for complex functional devices. This study reports a universal route to in‐plane integrate unidirectional metal halide perovskite CsPbBr₃ wire arrays with Sb₂Se₃, PbSeand CdS wires on mica substrates, respectively. It is found that the growth of the unidirectional wire arrays is controlled by a synergistic effect of the promoted initial nucleation on the transferred heterogeneous wires and the thermodynamically favored epitaxy on mica. The optical characterizations show that the CsPbBr₃ wire arrays can act as both the light emitting media and waveguide, where the emission in the CsPbBr₃ wires can be efficiently guided into the backbone Sb₂Se₃ wire. Importantly, the constructed CsPbBr₃ waveguide arrays/Sb₂Se₃ wire photodetector system shows 73.4 nA photocurrent with the on/off ratio of 111, by exciting the CsPbBr₃ wires at 174 mW cm⁻² of 405 nm laser. The frequency dependent photoresponse characterizations exhibit a response capability of 2000 Hz modulated laser pulse and a 3 dB frequency above 300 Hz, indicating the rapid response speed. This study promotes the application of semiconductor wires in on‐chip multifunctional integrated photonic devices.