Schematic sketch of a thin-film microcrystalline silicon solar cell (a) on a smooth substrate and (b) on a randomly textured substrate. The solid arrows [(a) and (b)] indicate the specularly transmitted and reflected light, while the dashed arrows (b) show the scattered and diffracted light inside the absorber layer.
(a) Schematic of a unit cell on smooth substrate and (b) corresponding simulated power loss profile under monochromatic illumination (wavelength of 700 nm).
Power loss profile of a microcrystalline silicon solar cell on a smooth substrate for different wavelengths.
(a) Schematic of a unit cell with a period 700 nm with integrated grating coupler and simulated power loss profile for groove heights (b) 100 nm, (c) 200 nm, and (d) 300 nm under monochromatic illumination (wavelength of 700 nm).
Comparison of quantum efficiency for cell on smooth substrate with grating couplers with a groove height of 300 nm and periods of 600 and 3000 nm.
Short circuit current for different grating parameters under red illumination (wavelength of 600–1100 nm) as a function of groove height of the unit cell.
Short circuit current for different grating parameters under red illumination (wavelength of 600–1100 nm) as a function of period of the unit cell.
Reflection and quantum efficiency for different groove heights under monochromatic illumination of wavelength 700 nm. The period of the diffraction grating was kept constant at 700 nm.
Comparison of experimental results with numerically simulated short circuit current under red illumination (wavelength range 600–1100 nm) for solar cells with grating couplers of groove height 400 nm and three different grating periods. (N.B. While period was fabricated in Ref. 17, this study investigated a period of ).
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