“…However, here I focused my discussion on the highly sensitive structures, charge transfer and performance of the dye molecules [81]. Push-pull type dyes used in DSSC devices usually have donor-acceptor (D-A), donor-π-spaceracceptor (D-π-A) [82], D-π-π-A, D-A ′ -π-A or D-D ′ -π-A structure types [83,84,85]. The electron donating group with highly positive mesomeric effects, synthetic availability and modularity includes aromatic amines such as triphenyl amine [86], carbazole [87] and triazatruxene [88].…”