Here,
we report on three new triphenylamine-based enamines synthesized
by condensation of an appropriate primary amine with 2,2-diphenylacetaldehyde
and characterized by experimental techniques and density functional
theory (DFT) computations. Experimental results allow highlighting
attractive properties including solid-state ionization potential in
the range of 5.33–5.69 eV in solid-state and hole mobilities
exceeding 10
–3
cm
2
/V·s, which are
higher than those in spiro-OMeTAD at the same electric fields. DFT-based
analysis points to the presence of several conformers close in energy
at room temperature. The newly synthesized hole-transporting materials
(HTMs) were used in perovskite solar cells and exhibited performances
comparable to that of spiro-OMeTAD. The device containing one newly
synthesized hole-transporting enamine was characterized by a power
conversion efficiency of 18.4%. Our analysis indicates that the perovskite–HTM
interface dominates the properties of perovskite solar cells. PL measurements
indicate smaller efficiency for perovskite-to-new HTM hole transfer
as compared to spiro-OMeTAD. Nevertheless, the comparable power conversion
efficiencies and simple synthesis of the new compounds make them attractive
candidates for utilization in perovskite solar cells.
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