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The rigorous coupled wave approach (RCWA) was implemented to investigateoptical absorption in a triple-p-i-n-junction amorphous-silicon solar cell witha 2D metallic periodically corrugated backreflector (PCBR). Both total anduseful absorptances were computed against the free-space wavelength $\lambda_o$for both s- and p-polarized polarization states. The useful absorptance in eachof the three p-i-n junctions was also computed for normal as well as obliqueincidence. Furthermore, two canonical boundary-value problems were solved forthe prediction of guided-wave modes (GWMs): surface-plasmon-polariton waves andwaveguide modes. Use of the doubly periodic PCBR enhanced both useful and totalabsorptances in comparison to a planar backreflector. The predicted GWMs werecorrelated with the peaks of the total and useful absorptances. The excitationof GWMs was mostly confined to $\lambda_o < 700$ nm and enhanced absorption. Asexcitation of certain GWMs could be correlated with the total absorptance butnot with the useful absorptance, the useful absorptance should be studied whiledevising light-trapping strategies.

On optical-absorption peaks in a nonhomogeneous thin-film solar cell with a two-dimensional periodically corrugated metallic backreflector