Amphiphilic Ruthenium(II) Terpyridine Sensitizers with Long Alkyl Chain Substituted β-Diketonato Ligands: An Efficient Coadsorbent-Free Dye-Sensitized Solar Cells

Table 2

Adsorbed amount of dye and cell performance^a of A1, A2, and A3 sensitizers with and without DCA.

Sensitizer	DCA (mM)	IPCEmax	J sc (mA cm^-2)	V oc (V)	FF	η (%)	Dye load^b (10^-8 mol cm^-2)
A1	0	67	15.9	0.53	0.63	5.31	11.5
	15	74	18.5	0.56	0.64	6.63	7.6
A2	0	69	17.2	0.57	0.63	6.18	9.4
	15	72	18.1	0.58	0.65	6.82	7.2
A3	0	72	18.0	0.64	0.66	7.60	7.3
	15	70	17.4	0.64	0.67	7.46	6.6

^aConditions: sealed cells; coadsorbate, DCA 0 or 15 mM; photoelectrode, TiO₂ (20 μm thickness and 0.25 cm²); electrolyte, 0.6 M DMPII, 0.1 M LiI, 0.05 I₂ in AN; irradiated light, AM 1.5 solar light (100 mW cm^-2). J _sc: short-circuit photocurrent density; V _oc: open-circuit photovoltage; FF: fill factor; η: total power conversion efficiency; IPCE: incident photon-to-current conversion efficiency.
^bSurface concentration of the dye molecules on TiO₂ film.