Self-Organized One-Dimensional TiO_𝟐 Nanotube/Nanowire Array Films for Use in Excitonic Solar Cells: A Review

Table 1

Absorption, emission, and electrochemical properties of SQ-1, SK-1, SK-2 dyes, and P3HT polymer [7, 51].

Dye/Polymer	𝜆aabs, nm (𝜀, M^−1cm^−1)	𝜆aem, nm	𝐸box/[V versus Fc/Fc^+]	𝐸c0-0, [eV]	𝐸dHOMO, [eV]	𝐸dLUMO, [eV]
SK-1	342, 582	642	0.41	2.00	5.21	3.21
SK-2	359, 619	721	0.63	1.85	5.43	3.58
SQ-1 dye	637 (159, 700)	652	0.38	1.93	5.18	3.25
P3HT	443	568	—	1.9	5.1	3.2

^aAbsorption and emission spectra were measured in ethanol solution.
^bA silver wire was used as a pseudoreference electrode and was calibrated with a ferrocene/ferrocenium (Fc/Fc⁺) redox couple. The electrochemical experiments were measured in CH₃CN with 0.1 M (𝑛-C₄H₉)₄NPF₆ with a scan rate of 100 mVs⁻¹.
^c𝐸_0-0 was determined from intersection of absorption and emission spectra in ethanol.
^dThe energy levels of the HOMO and LUMO were determined using the following equations: 𝐸_HOMO (eV) = 𝐸_ox − 𝐸_FC/FC⁺ + 4.8 eV and 𝐸_LUMO (eV) = 𝐸_HOMO − 𝐸_0-0.