GeSe: Optical Spectroscopy and Theoretical Study of a van der Waals Solar Absorber.

ABSTRACT: The van der Waals material GeSe is a potential solar absorber, but its optoelectronic properties are not yet fully understood. Here, through a combined theoretical and experimental approach, the optoelectronic and structural properties of GeSe are determined. A fundamental absorption onset of 1.30 eV is found at room temperature, close to the optimum value according to the Shockley-Queisser detailed balance limit, in contrast to previous reports of an indirect fundamental transition of 1.10 eV. The measured absorption spectra and first-principles joint density of states are mutually consistent, both exhibiting an additional distinct onset ∼0.3 eV above the fundamental absorption edge. The band gap values obtained from first-principles calculations converge, as the level of theory and corre

SUBMITTER: Murgatroyd PAE 

PROVIDER: S-EPMC7161679 | biostudies-literature | 2020 Apr

REPOSITORIES: biostudies-literature