Abstract
Using the observed temperature dependence of photon absorption spectrum and the weak-phonon interaction second-order transition theory, phonon-coupling enhanced photon absorption is predicted for and alloys. The ab initio calculated electron and phonon properties of the alloyed amorphous phase show minimally altered electronic states and significant redshifted phonon energies. This phonon shift enhances the optical phonon-coupled photon absorption resulting in increased current generation near the optical band edge. We find that this enhancement favors low-energy optical-phonon modes, thus making the soft-bond forming Sn the choice alloying element.
- Received 17 August 2010
DOI:https://doi.org/10.1103/PhysRevB.82.134205
©2010 American Physical Society