Fig. 5: Light-trapping via angular absorption cutoff.
From: Improved silicon solar cells by tuning angular response to solar trajectory
a Obliquely incident light is absorbed for a range of angles but reflected once too oblique, correspondingly restricting light escape19. b Angular response of a 51-layer bandpass antireflection coating designed for space solar cell cover-glass46. Of interest is the long-wavelength absorption edge shift to shorter wavelengths as the incidence angle increases. Also shown (dashed bars to the right) is the transmission through a bare glass surface as a benchmark.
