Optical spectrum of bottom-up graphene nanoribbons: towards efficient atom-thick excitonic solar cells.

ABSTRACT: Recently, atomically well-defined cove-shaped graphene nanoribbons have been obtained using bottom-up synthesis. These nanoribbons have an optical gap in the visible range of the spectrum which make them candidates for donor materials in photovoltaic devices. From the atomistic point of view, their electronic and optical properties are not clearly understood. Therefore, in this work we carry out ab-initio density functional theory calculations combine with many-body perturbation formalism to study their electronic and optical properties. Through the comparison with experimental measurements, we show that an accurate description of the nanoribbon's optical properties requires the inclusion of electron-hole correlation effects. The energy, binding energy and the corresponding excitonic trans

SUBMITTER: Villegas CE 

PROVIDER: S-EPMC4192635 | biostudies-literature | 2014 Oct

REPOSITORIES: biostudies-literature