IPCE is usually used to find the response of semiconductors to different photons of light. But can it be also used to find the band gap of semiconductors as it is conventionally calculated via Tauc-plots?
IPCE is Incident photon to current efficiency, which is may use to calculate the bandgap of semiconductors via Tauc-plot. This is an alternate protocol because, used to find the response to semiconductors to different photons of light.
By fitting the mathematical model to the measured external quantum efficiency (EQE), bandgap gradient is measured. Please find the attached article to know about mathmatical model.