Abstract
Presently, enhanced conversion efficiency with reduced cost of thin film solar cells is the primary objective of scientific community. Hence, light trapping mechanism is essential and have been explored to improve the performance of solar cell e.g. pyramidal surface texture, diffraction grating, Bragg reflector etc. In this paper, we present three designs of thin film solar cells based on periodic array of silver (Ag) grating at the bottom, indium-tin-oxide ITO grating at the top and both (dual) gratings. Dual grating based solar cell design showed better waveguiding due to top ITO grating whereas surface plasmon effect was sustained due to bottom silver grating. Furthermore, we have optimized the thickness of anti-reflection coating (ARC) layer and diffracting grating which could showed a relative enhancement in solar cell efficiency ∼154% from dual grating based solar cell as comparison to a reference (planar) solar cell of 1 μm thickness. This presented design of solar cells would be useful to realize the importance of dual grating which supports photonic as well as plasmonic modes.
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