I believe the written sources that tend to establish that several resistors in a group revert to a single equivalent resistor.

I believe that the parallel diodes will gather a reverse open circuit voltage up to the infra red photon energy or a voltage where reverse avalanche breakdown current returns the power.

I do expect each diode to rectify the Johnson noise at the depletion region with its asymmetrical tunneling making the forward resistance lower. The interior of each diode is a separate kTB element.

I vaguely remember from Scientific American a chemical system using a Cr compound that collected IR photons and released an occasional visible light photon.

Aloha, Charlie