photodiode: photovoltaic vs photoconductive

Three questions:

1) On a photodiode data ***, you see the spectral response (i.e.
responsitivity in A/W vs the wavelength), however it never clarifies
if this is for photovoltaic (no bias applied) or photoconductive (with
a bias) mode. Which mode is this for?

2) For a photodiode, would its responsitivity (or Quantum Efficiency)
be different between photovoltaic or photoconductive mode.

3) Can you have a quantum efficiency more than 100% (e.g. from what I
understand, not for silicon photodiodes, but potentially for other
materials)?

Thank you.

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