Researchers studied how to control the shape of C fullerene by using liquefied porphyrins as host materials.
The process involved slowly evaporating toluene from a mixture of porphyrin and C, resulting in a composite with a 3:1 molar ratio.
The binding between porphyrins and C fullerene appears to depend on specific interactions rather than traditional binding theories, suggesting a phenomenon called "supramolecular solvation," which gives the composites a glassy state at room temperature.
* TACIC-BO, which has medium-length branched alkoxy chains, yielded the highest power conversion efficiency (PCE) of 9.92%, while TACIC-HD with the longest chains hindered electron mobility, resulting in a lower PCE of 8.21%.
* Despite TACIC-EH's low solubility and formation of large aggregates, it displayed effective exciton diffusion due to its long exciton lifetime, achieving a moderate PCE of 7.10%. *
Researchers developed a new electron-acceptor molecule called TACIC for use in organic photovoltaics (OPVs) that boasts a long exciton lifetime, a narrow energy band gap, and effective light-harvesting abilities.*
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The TACIC film, with a unique self-assembling nanographene structure, achieved a narrow band gap (1.59 eV) and an exceptionally long exciton lifetime (1.59 ns), facilitating high-efficiency exciton diffusion and charge transfer when paired with a polymer donor.*
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The resulting OPV device combining TACIC and polymer PBDB-T showed impressive performance with an incident photon-to-current efficiency over 70% and a power conversion efficiency around 10%,