As
a kind of photodetector, position-sensitive-detectors (PSDs)
have been widely used in noncontact photoelectric positioning and
measurement. However, fabrications and applications of solar-blind
PSDs remain yet to be harnessed. Herein, we demonstrate a solar-blind
PSD developed from a graphene/Ga2O3 Schottky
junction with a 25-nanometer-thick Ga2O3 film,
in which the absorption of the nanometer-thick Ga2O3 is enhanced by multibeam interference. The graphene/Ga2O3 junction exhibits a responsivity of 48.5 mA/W
and a rise/decay time of 0.8/99.8 μs at zero bias. Moreover,
the position of the solar-blind spot can be determined by the output
signals of the PSD. Using the device as a sensor of noncontact test
systems, we demonstrate its application in measurement of angular,
displacement, and light trajectory. In addition, the position-sensitive
outputs have been used to demodulate optical signals into electrical
signals. The results may prospect the application of solar-blind PSDs
in measurement, tracking, communication, and so on.