Schottky diode in mount with
electrical contacts: The actual diode
is an ~ 1mm diameter (unseen in photo) area on the silicon
fragment. The 1mm diode is on the left edge of the wafer and
in half so light can be introduced from the side and spatially
across the junction area.
Other samples: 1cm
diameter, 0.5nm gold layer on n-type, 650um thick Si
face is , 1-10 Ohms-cm.