Surface photovoltage spectroscopy (SPV) measures the light-induced change in surface potential to non-destructively reveal the charge-separation behavior of a semiconductor after it absorbs photons. Because it does not damage the sample, SPV is a common starting point for photocatalytic mechanism characterization.
SPV yields information such as the band gap, flat-band position, and charge-separation efficiency, helping to judge whether "charges really separate after light absorption." In photocatalysis, charge-separation efficiency directly sets the upper limit of activity.
Before committing to extensive activity evaluation, first use SPV to confirm the material's intrinsic charge behavior. This avoids simply blaming the catalyst for "low activity," and instead distinguishes whether the problem lies in light absorption, charge separation, or surface reaction.
SPV reveals the "intrinsic material," while activity evaluation (such as the PLR-GSPR Atmospheric-Pressure Gas-Solid Photocatalytic Reaction System) shows the "real reaction." Only by combining the two can the mechanism be fully explained.
Free consultation: Can't pin down your photocatalytic mechanism? Perfectlight's PL-SPV/IPCE1000 Steady-State Surface Photovoltage Spectrometer lets you non-destructively see through charge separation right from the SPV starting point—saving you wasted effort.
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SPV measures the light-induced surface-potential change to non-destructively reveal how a semiconductor separates photogenerated charges after absorbing photons.
It gives band gap, flat-band position, and charge-separation efficiency—key clues to whether charges truly separate after light absorption.
Confirming intrinsic charge behavior with SPV before activity tests helps distinguish absorption, separation, and surface-reaction problems instead of blaming the catalyst.
This article does not constitute a performance commitment; specific technical parameters are subject to the actual product documentation and mutual confirmation.
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