Abstract
The achievement of perfect light absorption in ultrathin semiconductor materials is not only a long‐standing goal, but also a critical challenge for solar energy applications, and thus requires a redesigned strategy. Here, a general strategy is demonstrated both theoretically and experimentally to create a planar metasurface absorber comprising a 1D ultrathin planar semiconductor film (replacing the 2D array of subwavelength elements in classical metasurfaces), a transparent spacer, and a metallic back reflector. Guided by derived formulisms, a new type of macroscopic planar metasurface absorber is experimentally demonstrated with light near‐perfectly and exclusively absorbed by the ultrathin semiconductor film. To demonstrate the power and simplicity of this strategy, a prototype of a planar metasurface solar cell is experimentally demonstrated. Furthermore, the device model predicts that a colored planar metasurface perovskite solar cell can maintain 75% of the efficiency of its black counterpart despite the use of a perovskite film that is one order of magnitude thinner. The displayed cell colors have high purities comparable to those of state‐of‐the‐art color filters, and are insensitive to viewing angles up to 60°. The general theoretical framework in conjunction with experimental demonstrations lays the foundation for designing miniaturized, planar, and multifunctional solar cells and optoelectronic devices.
Highlights
Wang MIIT Key Laboratory of Thermal Control of Electronic Equipment School of Energy and Power Engineering building block, an ultrathin planar semiconductor film, we experimentally demonstrated a new type of macroscopic nearperfect solar absorbers with most the light absorbed in Nanjing University of Science and Technology Nanjing 210094, China E-mail: liudong15@njust.edu.cn
We derived a new formalism to elucidate the absorption in the semiconductor film for the planar metasurface shown in Figure 1, which is very important for solar PV applications
We investigated the dissipative properties of planar metasurfaces
Summary
Wang MIIT Key Laboratory of Thermal Control of Electronic Equipment School of Energy and Power Engineering building block, an ultrathin planar semiconductor film, we experimentally demonstrated a new type of macroscopic nearperfect solar absorbers with most the light absorbed in
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