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I assume this photodetector also uses the photoelectric effect like PV cells. Does anyone know why they wouldn't just use the more established pv tech? Said only getting efficiency of 6%.

Is there something fundamentally different about a photodetector vs. a pv cell that necessitates using different photon hitting material?

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I'm just guessing here, but having "a short response time to changes in input" might not be a priority for PV technology

The reason they aren't using more established pv tech is that they're demonstrating a new class of photoelectric material. This material may be cheaper to produce than more established pv materials and may be easier to tune to specific wavelengths, which is of interest to photodetection

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