Publication date: 17th February 2025
Concentrating light has been one of the most important tools in various fields of modern science. Traditional passive lenses are fundamentally limited by the degree of collimation of the incoming beam, which restricts their ability to concentrate diffuse light. Active lenses, such as luminescent solar concentrators (LSCs), do concentrate diffuse light, theoretically offering high concentration factors corresponding to the Stokes shift. However, in practice the performance is significantly below the theoretical limit due to inherent design efficiencies, with champion devices reaching a concentration factor of only 2. The transverse design of LSCs leads to substantial losses through escape cones and reabsorption, limiting their scalability and efficiency.
This research introduces a novel approach to diffuse light concentration by utilizing a light-absorbing layer as a collimator rather than a concentrator. Diffuse light is absorbed from the top and collimated light is emitted from the bottom or top, which can then be concentrated using passive lenses. This longitudinal approach maintains the same thermodynamic limit as conventional LSCs but overcomes the loss mechanisms associated with a transverse design.
Simulations using microlens arrays and a mixed halide perovskite film as absorbing layer demonstrate concentration factors exceeding 100X with realistic material parameters. This represents a 50-fold enhancement compared to state-of-the-art luminescent solar concentrators, potentially opening up a revolution in active lenses for diffuse light concentration.
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