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A high sensitivity photovoltaic effect has been observed in a heterojunction composed of n-type wide bandgap oxide SrTiO3−δ and p-type Si fabricated by laser molecular beam epitaxy. The responsivity of open-circuit photovoltage can reach 104 V/W without any amplification under zero bias for the wavelength range from visible to near infrared light in nW-μW order. We attribute the high performance of...
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