V-shaped hole transporting
materials based on <i>N</i>,<i>N</i>,<i>N</i>′,<i>N</i>′-tetraarylbenzidine (TPD)-type
moieties conjoined by Tröger’s
base core were synthesized and investigated. These hole transporting
materials were obtained by a three-step synthetic method, are fully
amorphous, and demonstrate high glass transition temperatures and
good thermal and morphological stability. Relatively high charge mobility
(up to 0.036 cm<sup>2</sup> V <sup>–1</sup> s<sup>–1</sup>) was measured in these hole transporting materials, exceeding that
of corresponding methyl and methoxy substituted TPD analogues without
TB core by more than 2 orders of magnitude. Determined ionization
potential and charge mobility values permit use of the synthesized
compounds as hole transporting materials in fabrication of perovskite
solar cells