Why does the photocurrent density does not proportionally increase upon increasing the incident light intensity?

01 January 2020 1 324 Report

I have prepared a photocathode and carried out linear sweep voltammetry (LSV) measurements. When I increased the incident light intensity, the photocurrent has not increased proportionally.

May I please what could be the reason? Or What analysis should I do to justify this trend?

The attached image has the LSV measurements of the photocathode.

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