Title:
Spectroscopic Signatures of Low-dimensional Excitonic Systems
Spectroscopic Signatures of Low-dimensional Excitonic Systems
Time:
10/24 (Sat.) 5 pm PDT, 6 pm MDT, 7 pm CDT, 8 pm EDT
10/25 (Sun.) 8 am Taiwan
10/24 (Sat.) 5 pm PDT, 6 pm MDT, 7 pm CDT, 8 pm EDT
10/25 (Sun.) 8 am Taiwan
Keywords:
Chemistry, Theoretical chemistry, Chemical physics, Exciton, 2D Material, Organic Dye Aggregate, Dispersion
Chemistry, Theoretical chemistry, Chemical physics, Exciton, 2D Material, Organic Dye Aggregate, Dispersion
Abstract:
Molecular semiconductors are a group of promising materials featuring low manufacturing cost and ease of processing. One of the key strategies in assessing its optoelectronic prospect is the combination of the modularity of constituent molecules and the packing conditions that control the intermolecular interactions. In many cases the latter is challenging to characterize by conventional experimental analytical tools such as x-ray scattering or electron microscopy, leaving optical measurements as the only option. We theoretically establish close links between the packing conditions and its spectroscopic signatures that can be routinely measured in the laboratory. For two-dimensional molecular solids we derive closed-form expressions for the anisotropic dispersion relation in the long wavelength limit using a continuum approximation. This allows us to deduce the E^0.5 scaling of the exciton density of states close to the band edge that leads to robustness of large coherent length against disorder and thermal noise. Analytical expressions predicting (transient) absorption peak splittings are derived that can be useful for inferring structure-function relationship in low-dimensional semiconducting solids.
Molecular semiconductors are a group of promising materials featuring low manufacturing cost and ease of processing. One of the key strategies in assessing its optoelectronic prospect is the combination of the modularity of constituent molecules and the packing conditions that control the intermolecular interactions. In many cases the latter is challenging to characterize by conventional experimental analytical tools such as x-ray scattering or electron microscopy, leaving optical measurements as the only option. We theoretically establish close links between the packing conditions and its spectroscopic signatures that can be routinely measured in the laboratory. For two-dimensional molecular solids we derive closed-form expressions for the anisotropic dispersion relation in the long wavelength limit using a continuum approximation. This allows us to deduce the E^0.5 scaling of the exciton density of states close to the band edge that leads to robustness of large coherent length against disorder and thermal noise. Analytical expressions predicting (transient) absorption peak splittings are derived that can be useful for inferring structure-function relationship in low-dimensional semiconducting solids.
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