Optical and Electronic Properties of Molecular Systems Derived from Rhodanine

Area of Science:

• Organic electronics
• Materials science
• Photovoltaics

Background:

• Dicyanorhodanine derivatives are key building blocks in organic electronics.
• Their optical, electronic, and charge transport properties are crucial for organic photovoltaic (OPV) applications.

Purpose of the Study:

• To investigate the electronic and optical properties of push-pull dicyanorhodanine derivatives.
• To analyze charge transport characteristics and identify superior hole-transporting materials for OPVs.

Main Methods:

• Computational analysis of frontier molecular orbitals.
• Investigation of vertical electronic absorption transitions.
• Comparison of intramolecular charge transfer (ICT) and solvent effects.
• Evaluation of reorganization energy for electron and hole transport.

Main Results:

• Vertical electronic absorption transitions are characterized as intramolecular charge transfer (ICT).
• Compounds exhibit bathochromic shifts in the presence of a solvent medium.
• A clear transport hierarchy was established, with (Z)-2-(1,1-dicyanomethylene)-5-[(4-dimethylamino)benzylidene]-1,3-thiazol-4 demonstrating superior hole transport capabilities compared to (Z)-2-(1,1-dicyanomethylene)-5-(tetrathiafulvalene-2-ylidene)-1,3-thiazol-4.

Conclusions:

• Dicyanorhodanine derivatives possess tunable electronic and optical properties suitable for OPVs.
• Solvent interactions significantly influence the spectral properties of these compounds.
• The identified superior hole transporter offers potential for enhanced OPV device performance.