Well-defined ID microwires of CuPcOC4 with diameters of about 1.0 mu m and lengths ranging from 260 to 300 mu m as well as ultralong microwires (> 5 mm) with diameters of about 10 mu m and high length/diameter aspect ratios were synthesized via a simple solution process. Electrical conductive devices based on these microwires fabricated in situ on glass substrates with two ITO electrodes exhibited excellent conductivity properties.