Research Of Photodetector Based On MAPbI₃ Nanowires

Organic-inorganic hybrid perovskite is a promising new generation photodetection materials due to its advantages of direct bandgap,high absorption coefficient and high carrier mobility.Researches have shown that the perovskite nanomaterials have varies morphology,such as quantum dots,nanowires,nanorods,nanosheets and so on.In particular the anisotropic nanowires'photogenerated carriers transmit efficiently along the axial,which enhancing the charge extraction efficiency of the photodetector.The preparation methods of perovskite nanowires mainly include the solution method and chemical vapor deposition method.Compared with the solution method,the incorporation of the solvent is reduced during the chemical vapor deposition process,and the crystallization quality of the crystal is expected to be further improved.However,the reported perovskite nanowires prepared by chemical vapor deposition have a short length of only about 20 microns.In this paper,we use the gas-liquid-solid growth method,that is,use the metal nanoparticle to catalyzes the growth of lead iodide nanowire template,and then uses chemical vapor deposition method to convert the lead iodide nanowire template into methylamine lead iodine perovskite.The nanowires have a length of more than 100 micrometers and a diameter of about 300 nanometers.And the photodetectors based on the above lead iodide nanowires and methylamine lead iodine perovskite nanowires were prepared:the response speed of the lead iodide nanowire photodetector was several milliseconds,and the linear dynamic range was as high as 169 dB;the photodetector based on methylamine lead iodine nanowires has a high responsivity?285.67 mA/W?and detectivity(8.927×10¹⁰ Jones).