Organolead halide perovskites are becoming intriguing materials applied in optoelectronics. In the present work, organolead iodide perovskite (OIP) nanowires (NWs) have been fabricated by a one step self-assembly method. The controllable NW distributions were implemented by a series of facile techniques: monolayer and small diameter NWs were prepared by precursor concentration tuning; NW patterning was achieved via selected area treatment assisted by a mask; NW alignment was implemented by modified evaporation-induced self-assembly (EISA). The synthesized multifunctional NWs were further applied in photodetectors (PDs) and solar cells as application demos. The PD performances have reached 1.32 AW⁻¹ for responsivity, 2.5 × 10¹² Jones for detectivity and 0.3 ms for response speed, superior to OIP films and other typical inorganic NW based PD performances. An energy conversion efficiency of ∼2.5% has been obtained for NW film based solar cells. The facile fabrication process, controllable distribution and optoelectronic applications make the OIP NWs promising building blocks for future optoelectronics, especially for low dimensional devices.

A carbon-free nanocomposite consisting of MoO₂ nanoparticles embedded between MoSe₂ nanosheets, named MoO₂@MoSe₂, has been synthesized and demonstrated excellent electrochemical properties for lithium ion batteries. In such a composite, MoSe₂ nanosheets provide a flexible substrate for MoO₂ nanoparticles; while MoO₂ nanoparticles act as spacers to retain the desired active surface to electrolyte and also introduce metallic conduction. In addition, the heterojunctions at the interface between MoSe₂ and MoO₂ introduce a self-built electric field to promote the lithiation/delithiation process. As a result, such lamellar composite has a long cycling stability with a reversible capacity of 520.4 mA h g⁻¹ at a current density of 2000 mA g⁻¹ after 400 cycles and excellent rate performance, which are attributed to the synergistic combination of the two components in nanoscale.