Patent ID: 7410906

Claim:
A method of producing a functional device comprising a light-transmitting electrode layer provided as an upper layer of a layer containing an organic material, the layer being as a functional layer, wherein a step of patterning the light-transmitting electrode layer comprises a high speed etching step of etching the electrode layer at a rate of 10 nm/min or more; wherein the etchant gas to be used at the high speed etching step comprises at least one of hydrogen iodide (HI), hydrogen bromide (HBr), hydrogen chloride (HCl), methane (CH 4 ) and methanol (CH 3 OH); wherein the high speed etching step is terminated with the light-transmitting electrode left unetched in a predetermined amount and the patterning step comprises a low speed etching step of etching the remaining light-transmitting electrode at a rate lower than 10 nm/min after the high speed etching step; wherein the slow speed etching step is preceded by a step of etching by irradiation with argon ion.