Fig. 4: Light-scattering characterisation.

a Photograph of ρ_Aero-BN ~0.17 mg cm⁻³ illuminated with 100 mW (spot size ~1 mm) at 520 nm. b Photograph of the same sample shown in a when illuminated in the centre of a semitransparent glass bulb (front view). c, d Photograph of ρ_Aero-BN ~0.68 mg cm⁻³ illuminated with 100 mW at 520 nm, and resultant light scattering imaged using a semitransparent glass bulb (front view). e Angular photocurrent dependence for Aero-BN with different ρ_Aero-BN compared with an interconnected microrod structure (t-ZnO; ρ_T ~300 mg cm⁻³) for 520 nm at 100 mW. The photodiode is polar rotated over the sample, as illustrated in the schematics. The graphs represent the photocurrent produced by scattered light only. f Corresponding normalised photocurrent with respect to the azimuthal rotation of the photodiode. For details of measurements see Supplementary Figs. 17–20.