Micro-patterning of organic thin-film electronic devices by ultrashort laser

Micro-patterning of two types of organic thin-film electronic devices, an organic light emitting diode (OLED) display and an organic photovoltaic cell (OPV), are carried out using an ultrashort fiber laser. Selective machining technique of aluminium (Al) electrode of the OLED by an ultrashort fiber laser was developed and test pieces of the OLED display were fabricated successfully. It is found that the Al layer on ITO is removed by only one pulse so long as it is above its threshold energy. Similar process was applied to machining of OPV to fabricate modules in planer structure connected in series. The results indicate that selective machining of different part of OPV can be achievable using single ultrashort fiber laser. Machining conditions need to be optimized for each layer.