Hybrid J-Aggregate-Graphene Phototransistor

J-aggregates are fantastic self-assembled chromophores with very narrow and extremely sharp absorbance band in the visible and near-infrared spectrum and hence they have found many exciting applications in nonlinear optics, sensing, optical devices, photography, and lasing. In silver halide photography, for example, they have enormously improved the spectral sensitivity of photographic process due to their fast and coherent energy migration ability. On the other hand, graphene, consisting of single layer of carbon atoms forming a hexagonal lattice, has very low absorption coefficient. Inspired by the fact that J-aggregates have carried the role to sense the incident light in silver halide photography, we would like to use J-aggregates to increase spectral sensitivity of graphene in the visible spectrum. Nevertheless, it has been an outstanding challenge to place isolated J-aggregate films on graphene in order to extensively study interaction between them. We herein noncovalently fabricate isolated J-aggre...