  Using the Spectroscopic Limited Maximum Efficiency, and Shockley and Queisser
predictor models, we compute the solar efficiency of the chalcopyrites
AgMX2(M=In,Al;X=S,Se,Te). The results presented are based on the estimation of
the electronic and optical properties obtained from first principles density
functional theory as well as the many-body perturbation theory calculations.
The results from this report were consistent with the experimental data. The
optical bandgap was accurately estimated from the absorption spectra, obtained
by solving the Bethe and Salpeter equation. Fitting the Tauc's plot on the
absorption spectra, we also predicted that the materials studied have a direct
allowed optical transition. The theoretical estimations of the solar cell
performance showed that the efficiencies from the Shockley and Queisser model
are higher than those from the spectroscopic limited maximum efficiency model.
This improvement is attributed to the absorption.
