“…Before commencing any molecular engineering work upon the benzo[ α ]phenoxazine template, the most crucial step was to keep the framework intact such that all the fundamental characteristics of the dye are unchanged. The properties of untailored benzo[ α ]phenoxazine dyes are fine-tuned with the prerequisites of DSSC dyes, such as; (i) long-range absorbance from UV to the visible region, 26 (ii) high molar absorption coefficient, 39 (iii) adequate redox nature with well-positioned energy levels HOMO (−6.19 eV, effectively below the redox potential energy of liquid I − /I 3 − electrolyte that is −4.8 eV) and LUMO (−3.73 eV sufficiently above the conduction band of TiO 2 semiconducting metal oxide), 40,41 (iv) high intermolecular charge transfer capacity through alternate single bond and double bond character, 32 (v) long-range coupling, (vi) excellent thermal, electrochemical, and photostability, 26 (vi) feasibility of internal intramolecular charge transfer (ICT) through the heteroatoms infused in the aromatic ring. 32…”