NOVELTY - A metal precursor/organic polymer complex solution is prepared (S100) by mixing metal precursor and organic polymer in distilled water or organic solvent. The metal precursor/organic polymer complex solution is injected into electric field assisted robotic nozzle printer, and an aligned metal precursor/organic polymer complex nanofiber pattern is formed (S200) perpendicularly to the substrate. The aligned metal precursor/organic polymer complex nanofiber pattern is heat-treated, such that an aligned metal nanofiber pattern is formed (S300), to obtain metal nanofiber electrode array.    USE - Manufacture of metal nanofiber electrode array used for organic or inorganic field effect transistor, organic light-emitting diode and organic solar cell (all claimed).    ADVANTAGE - The method enables quick and simple manufacture of metal nanofiber electrode array having improved resolution of metal electrode pattern.    DETAILED DESCRIPTION - A metal precursor/organic polymer complex solution is prepared by mixing metal precursor and organic polymer in distilled water or organic solvent. The metal precursor/organic polymer complex solution is injected into nozzle of an electric field assisted robotic nozzle printer which forms a Taylor cone at end of the nozzle by applying an electric field, and an aligned metal precursor/organic polymer complex nanofiber pattern continuously connected by moving a substrate along with discharged complex solution to eject a continuously solidified nanofiber is formed perpendicularly to the substrate. The aligned metal precursor/organic polymer complex nanofiber pattern is heat-treated to pyrolyze organic polymer and to reduce metal precursor to metal nanograins, such that an aligned metal nanofiber pattern consisting of metal nanograins is formed, to obtain metal nanofiber electrode array. INDEPENDENT CLAIMS are included for the following:    (1) organic or inorganic field effect transistor;    (2) organic light-emitting diode; and    (3) organic solar cell.    DESCRIPTION OF DRAWING(S) - The drawing shows a flow chart explaining manufacture of metal nanofiber electrode array. (Drawing includes non-English language text)    Preparation of metal precursor/organic polymer complex solution (S100)    Formation of aligned metal precursor/organic polymer complex nanofiber pattern (S200)    Formation of aligned metal nanofiber pattern (S300)