Preparation Of Perovskite Nanowire Arrays And Their Applications In Photodetection

Recent years,perovskite has attracted more and more researcher's attention in the field of optoelectronic devices.This new type of semiconductors materials has interesting characteristics such as direct and adjustable band gap,high absorbance coefficient and high carrier mobility.One of the research orientation is adjusting and controlling the morphology of perovskite.It has been proved that the perovskite nanowires show optical anisotropy and the photogenerated carriers are limited in the radial direction but efficiently transport in the axial direction of nanowires.These unique properties are beneficial to expands the application scenarios of this material and improve the charge transport of perovskite-based optoelectronic devices.Highly ordered perovskite nanowire(PNW)arrays are important building blocks for potential application in integrated optoelectronic devices due to their unique properties.Herein,we have achieved the following results through this research.1.A recordable digital versatile disk nanochannel-confined self-assembly(NCSA)strategy was developed for large-scale growth of highly ordered arrangement PNW.The morphology and crystal structure of nanowire arrays were characterized by field emission scanning electron microscopy,atomic force microscopy and X-ray diffraction etc..It is proved that this method can be used to prepare different kinds of PNW(including MAPbI₃?MAPbBr₃?MAPbCl₃?FAPbBr₃?FAPbCl₃?CsPbI₃?Cs₃Cu₂I₅)with orientation growth characteristics on various substrates(including SiO₂/Si,glass,PP and PET).2.Photodetector constructed from MAPbI₃NW arrays exhibits prominent photoresponse properties with a responsivity of 20.56 A W^-1and specific detectivity of4.73×10¹²Jones,respectively,which are 128.5 times and 3.6 times better than the previous work of MAPbI₃microwire photodetector of our research group.3.What is more,the photodetector can function as a polarization-sensitive photodetector due to the crystallographic orientation of the one-dimensional PNW arrays,with a polarization ratio of 2.2,which expands the application scenarios of this material.