Self-Assembled Growth of Ultrastable CH3NH3PbBr3 Perovskite Milliwires for Photodetectors

The unstability of organolead halide perovskite under continuous illumination, moisture, and high temperature has seriously impeded its commercial development for long-period applications. Here, a facile method was developed to grow ultrastable CH3NH3PbBr3 milliwires through the reaction of self-assembled PbBr 2 milliwire with CH3NH3PbBr3 at room temperature. The initial self-assembled PbBr, milliwire is that PbBr2 complexed with dimethylformamide (DMF) molecular self-assemble into perovskite-type PbBr2. Crystal conversion from PbBr2 to CH3NH3PbBr3 milliwire occurred in the molecular exchange between CH3NH3PbBr3 and DMF. The synthesized CH3NH3PbBr3 milliwires present under high humidity similar to 75%, continuous illumination, heating, and sustain ultrastability in air for more than high stability 255 days. In addition, the CH3NH3PbBr3 milliwire can be dynamically degraded and reconstructed in the presence of water molecules. The milliwires have strong band-edge photoluminescence (PL) with PL lifetime of similar to 110 ns. On the basis of the mono-milliwireconstructed photodetector, it exhibits high photoresponse and fast response time of 0.407 s.