Synthesis and Investigation of the V‐shaped Tröger′s Base Derivatives as Hole‐transporting Materials

Abstract

V-shaped Tröger's base core has been investigated as a central linking unit in the synthesis of new charge-transporting materials for optoelectronic applications. The studied molecules have been synthesized in two steps from relatively inexpensive starting materials, and demonstrate high glass transition temperatures, good stability of the amorphous state, and comparatively high hole drift mobility (up to 0.011 cm(2) V(-1) s(-1) ).

New Efficient 1,1′‐Bi‐2‐naphthylamine‐Based Hole‐Transporting Materials for Perovskite Solar Cells

“…Q216 shows maximum absorption at 283 nm, and Q219 shows a higher extinction coefficient at 309 nm. All the absorption peaks are at ultraviolet region, indicating a minimized sunlight loss absorbed by HTMs …”

“…All the absorption peaks are at ultraviolet region, indicating a minimized sunlight loss absorbed by HTMs. [35] In order to test the absorption spectra of HTMs in solid state, a chlorobenzene solution dissolved of Q216 or Q219 was spin-coated on the surface of TiO2 films deposited on FTO substrates. Compared with the absorption spectrum in solution, the two HTMs show little red-shifting in absorption spectrum of thin film.…”

Application of a Tetra‐TPD‐Type Hole‐Transporting Material Fused by a Tröger's Base Core in Perovskite Solar Cells

“…These limitations are also partially noticeable in Spiro‐OMeTAD and could potentially be overcome by finding an alternative to spiro carbon as the connecting and orienting core and conjoining TPD‐type moieties in a different fashion. Tröger's base (TB) can serve this role as a functional core, allowing the synthesis of HTMs with decent properties and high charge mobility . The V‐shaped structure of TB provides an angle orientation for the conjugated π ‐systems attached to it, and the rigidity of the TB scaffold (as the high molecular mass via its twofold functionalization) impairs crystallization, making the TB derivatives highly amorphous and endowing them with significantly increased glass transition temperatures …”

2-Thiohydantoin Moiety as a Novel Acceptor/Anchoring Group of Photosensitizers for Dye-Sensitized Solar Cells

“…Therefore, their bandgap is expected to be very similar, resulting in similar light absorption properties. The most important fact is that the calculated HOMO energy levels are more negative compared to the reduction potential energy of the I 3 − /I − electrolyte (−4.80 eV), and the LUMO energy levels are more positive in reference to the conduction band of TiO 2 (−4.0 eV), both facilitating the expected transport of the photogenerated charge carriers [29]. Finally, the TD-DFT method was applied to predict the absorption spectra of the examined compounds and identify the most important electronic transitions.…”