Abstract
The interdigital Ag electrode is fabricated via a simple and fast approach called laser direct writing (LDW). The morphology and conductivity of electrode fingers are investigated systematically under different experimental parameters, including the laser spot size, laser power, and scanning speed. "Dose" describes the combined influence of these experimental parameters. It is found that overdose results in net-shape and dot-shape hollows in the middle of an Ag line due to the sintering degree and complex flow dynamics, which reduced the conductivity of the Ag lines. Based on the printed Ag electrodes with the best conductivity, a photodetector is customized further, which can detect the offset of the line-shape laser easily. Moreover, to the best of our knowledge, this is the first time the printed Ag electrodes are applied to photodetectors, which can be highly valuable for developing all-printed electronic devices by LDW in the future.
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