“…The absorption band at 346-392 nm in the UV region was attributed to the - * transition and another strong absorption band at 489-494 nm in the visible region was due to the n- * transition [37]. The red shift in maximum absorption for KA -compared to A -is due to expansion of overall conjugation systems after incorporation of kojic acid moieties and suggested some increased electron delocalization [38,39]. The corresponding data are presented in Table 1.…”
Sensitization of heavy metal free organic dyes onto TiO 2 thin films has gained much attention in dye sensitized solar cells (DSSCs). A series of new kojic acid based organic dyes KA -were synthesized via nucleophilic substitution of azobenzene bearing different vinyl chains A -with kojyl chloride . Azo dyes KA -were characterized for photophysical properties employing absorption spectrometry and photovoltaic characteristic in TiO 2 thin film. The presence of vinyl chain in A -improved the photovoltaic performance from 0.20 to 0.60%. The introduction of kojic acid obtained from sago waste further increases the efficiency to 0.82-1.54%. Based on photovoltaic performance, KA achieved the highest solar to electrical energy conversion efficiency ( = 1.54%) in the series.
“…The absorption band at 346-392 nm in the UV region was attributed to the - * transition and another strong absorption band at 489-494 nm in the visible region was due to the n- * transition [37]. The red shift in maximum absorption for KA -compared to A -is due to expansion of overall conjugation systems after incorporation of kojic acid moieties and suggested some increased electron delocalization [38,39]. The corresponding data are presented in Table 1.…”
Sensitization of heavy metal free organic dyes onto TiO 2 thin films has gained much attention in dye sensitized solar cells (DSSCs). A series of new kojic acid based organic dyes KA -were synthesized via nucleophilic substitution of azobenzene bearing different vinyl chains A -with kojyl chloride . Azo dyes KA -were characterized for photophysical properties employing absorption spectrometry and photovoltaic characteristic in TiO 2 thin film. The presence of vinyl chain in A -improved the photovoltaic performance from 0.20 to 0.60%. The introduction of kojic acid obtained from sago waste further increases the efficiency to 0.82-1.54%. Based on photovoltaic performance, KA achieved the highest solar to electrical energy conversion efficiency ( = 1.54%) in the series.
“…The trends of the HOMO levels are consistent with the previous literature. 41,42 Compound TPA-CZ has the highest oxidation potential due to its weakly electron-donating ability and bulky moiety. 33…”
A series of oxime esters (TPA-DP, TPA-CZ and TPA-PT) had been developed and synthesized, in which three electron-donating groups (diphenylamine, carbazole, or phenothiazine) are connected to the 4, 4’-positions of...
“…Solar energy is considered as an environmentally friendly, sustainable energy [1][2][3] . The improvement of the conversion efficiency of solar energy attracts more attentions [4][5][6][7] . In recent years, p-type dye-sensitized solar cells (p-DSCs) and photoelectrochemical cells (PECs) based on NiO semiconductor electrodes have provided more alternative ways to increase the utilization of solar energy which can convert solar energy into electrical energy and clean fuel, respectively, such as H 2 and CH 3 OH [8][9][10][11][12] .…”
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