Figure 2

Optical photographs of different Testing Zones. (a) A bigger Testing Zone with a diameter of 600 μm. It contains 4 Pd/Cr micro-TFTCs. The inset presents one of the Pd/Cr micro-TFTCs for details. The darker stripe is Cr stripe, the brighter stripe is Pd stripe. The stripe width is 3 μm. The overlapping junction on the top is the hot-end of the micro-TFTC. It has a diameter of 8 μm. (b) Two arrays of smaller Testing Zone with a diameter of 100 μm. Each Testing Zone contains 2 Pd/Cr micro-TFTCs.