DFT/TDDFT and Experimental Studies of Natural Pigments Extracted from Black Tea Waste for DSSC Application

Table 1

Calculated HOMO and LUMO energy levels and band gaps of BTE.

Sample	HOMO (eV)	LUMO (eV)	Band gap (eV)
BTE	−4.68	−1.71	2.97
Acidified BTE	−4.75	−1.95	2.80

All energy values are with respect to the vacuum level.