A method for fabricating a thin film metal oxide inverse opal structure using capillary phenomenon is disclosed. The method for fabricating a thin film metal oxide structure according to an embodiment of the present invention includes the steps of: arraying metal oxide nanoparticles and template particles comprising spherical polymer organic particles or inorganic particles having a uniform size, Forming a structure in which metal oxide nanoparticles are filled in the voids of the metal oxide nanoparticles; Placing a second substrate on top of the structure so that the structure is positioned between the first and second substrates; The first and second substrates and the structure are immersed in a solution in which the metal precursor is dispersed so that the metal precursor solution is filled in the voids existing in the structure due to the capillary phenomenon depending on the gap and the surface tension of the first and second substrates, ; And removing the template particles to form an inverse opal structure.
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