Using the Transfer Matrix method and Abele’s Matrix method, several types of absorptive multilayer structures have been proposed exclusively for thin-film solar cells, which can absorb the solar spectrum in the wavelength range from 300 nm to 3000 nm with the angles of incidence from 0◦ to 90◦ considerably. Furthermore, the absorption rate of these structures has been investigated and calculated at the angle of incidence 70◦ with considering the dispersion effect and making use of the Sellmeier Equations. For coherency sunlight, the results illustrate that the absorption rate of all structures has been increased significantly by applying the dispersion effect compared with the absence of the dispersion effect for TM waves while the absorption rate has been expanded up to 40% in all structures virtually with undergoing optimization for incoherency sunlight. As a result, the four-layer structure with the maximum absorption rate, without applying the dispersion relation has been absorbed 91% of the sunlight on average while utilizing the dispersion relation has been absorbed 99% of the sunlight on average for TM waves. In addition, the magnetic fields under dispersion effect have been reduced to keep safe the structures and also intensity of sunlight was monotone in TM waves and incoherency light to preserve them against solar intensity fluctuations at various angles.
