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The spin-split indirect bandgap in hybrid-halide perovskites provides amomentum-space realisation of a photon-ratchet intermediate band. Excitedelectrons thermalise to recombination-protected Rashba pockets offset inmomentum space, building up the charge density to have sufficient flux to thehigher lying conduction band. This effect could be used to form an intrinsicintermediate band solar cell with efficiencies beyond the Shockley-Queisserlimit if a selective low-electron affinity contact can be made to the higherconduction state. This concept is supported by analysis of the many-bodyelectronic structure. Production of above-bandgap voltages under illuminationwould affirm the physical mechanism proposed here.

A photon ratchet route to high-efficiency hybrid halide perovskite intermediate band solar cells