Bandgap Tunable Cs_x?CH₃NH₃?_1-xPbI₃ Perovskite Nanowires By Aqueous Solution Synthesis For Optoelectronic Devices

Both all-inorganic perovskite and organolead iodide perovskite materials show powerful performances applied in optoelectronic devices.But there is limitation in consistency of synthetic methods for the two kind of perovskites.An efficient synthetic route by using PbI₂ saturated aqueous solution was proposed to grow inorganic and organic kation hybrid perovskite nanowires?NWs?.By controlling the proportion of CsI and CH₃NH₃I,the Cs_x?CH₃NH₃?_1-xPbI₃ perovskite NWs successfully grew in water,which had some superior advantages in quality and stability.And every single Cs_x?CH₃NH₃?_1-xPbI₃ perovskite NW was demonstrated an integrated single crystal contained all of Cs,N,Pb,I elements.With the change of kation ratio,the bandgaps could be tuned from 1.5 to 1.7eV and the PL peak positions could be tuned from 698 to770 nm.Based on a single Cs_0.5?CH₃NH₃?_0.5PbI₃ perovskite NW,a reliable single-NW photodetector with high performance was fabricated,which had responsivity of 23 A/W and stable normalized detectivity of 2.5×10¹¹ Jones.The kation hybrid Cs_x?CH₃NH₃?_1-xPbI₃ perovskite materials are expected to contribute to the development of optoelectronic devices.