A fundamental strategy is developed to enhance the light-matter interaction of ultra-thin films based on a strong interference effect in planar nanocavities, and overcome the limitation between the optical absorption and film thickness of energy harvesting/conversion materials. This principle is quite general and is applied to explore the spectrally tunable absorption enhancement of various ultra-thin absorptive materials including 2D atomic monolayers.

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On page 2737, Q. Gan, S. Jiang, and co‐workers develop a fundamental strategy to enhance the light‐matter interaction of ultra‐thin (i.e., 1.5–3 nm) Ge films based on a strong interference effect in planar nanocavities, and overcome the limitation between the optical absorption and film thickness of energy‐harvesting/conversion materials. This principle is quite general and can be applied to explore the spectrally tunable absorption enhancement of various ultra‐thin absorbing materials.

We exploit optical resonance in an ultra-thin (6 to 31 nm) undoped amorphous silicon/organic hybrid photovoltaic (PV) structures that can produce semi-transparent transmissive colors insensitive to incidence angle of up to ±70° regardless of polarization.