1. Date of download: 6/7/2016 Copyright © 2016 SPIE. All rights reserved. (a) Chemical structures of the interface dye (ID) D5L0A3 and hole transporting dye (HTD) tris(4-(5-phenylthiophen-2- yl)phenyl)amine (TPTPA), investigated in this work including schematic energy level alignment of the dyes with respect to TiO2. (b) Scanning electron microscopy (SEM) cross-section image of the HTD TPTPA infiltrated into a 150-nm-thick mesoporous TiO2 film on conducting fluorine-doped tin oxide (FTO) electrode with compact TiO2 (c−TiO2) layer prepared by spray pyrolysis. Figure Legend: From: Hole transporting dye as light harvesting antenna in dye-sensitized TiO2 hybrid solar cells J. Photon. Energy. 2015;5(1):057406. doi:10.1117/1.JPE.5.057406

2. Date of download: 6/7/2016 Copyright © 2016 SPIE. All rights reserved. Absorption (solid line) and emission (dashed line) spectra of TPTPA and D5L0A3 embedded in poly-methylmethacrylate (PMMA) (a) and adsorbed onto mesoporous ZrO2 (b). Figure Legend: From: Hole transporting dye as light harvesting antenna in dye-sensitized TiO2 hybrid solar cells J. Photon. Energy. 2015;5(1):057406. doi:10.1117/1.JPE.5.057406

3. Date of download: 6/7/2016 Copyright © 2016 SPIE. All rights reserved. (a) Photoluminescence (PL) spectra of TPTPA dissolved in PMMA with increasing molar ratios of D5L0A3, TPTPA:D5L0A3 = 1:0 [a], 1:0.24 [b], 1:2.5 [c], 0:1 [d] (inset: normalized corresponding absorption spectra). (b) PL spectra of TPTPA on ZrO2 in the absence and presence of D5L0A3 ([e] and [f], respectively, [g] is D5L0A3 on ZrO2). Figure Legend: From: Hole transporting dye as light harvesting antenna in dye-sensitized TiO2 hybrid solar cells J. Photon. Energy. 2015;5(1):057406. doi:10.1117/1.JPE.5.057406

4. Date of download: 6/7/2016 Copyright © 2016 SPIE. All rights reserved. Electrochemical characterization performed on TPTPA as a solid film and D5L0A3 adsorbed to mesoporous TiO2 using an ionic liquid as electrolyte. The applied potential Va is shown with respect to the formal potential of ferrocene (Fc/Fc+). Figure Legend: From: Hole transporting dye as light harvesting antenna in dye-sensitized TiO2 hybrid solar cells J. Photon. Energy. 2015;5(1):057406. doi:10.1117/1.JPE.5.057406

5. Date of download: 6/7/2016 Copyright © 2016 SPIE. All rights reserved. (a) Spectroelectrochemistry showing the spectral signatures of D5L0A3+ and TPTPA+. These were electrochemically generated using conditions as in Fig. 4. (b) Nanosecond transient absorption spectra of D5L0A3 on TiO2, TPTPA on TiO2, and D5L0A3 with added TPTPA on TiO2 at a delay time of 790 ns. Figure Legend: From: Hole transporting dye as light harvesting antenna in dye-sensitized TiO2 hybrid solar cells J. Photon. Energy. 2015;5(1):057406. doi:10.1117/1.JPE.5.057406

6. Date of download: 6/7/2016 Copyright © 2016 SPIE. All rights reserved. External quantum efficiency (EQE) spectra of solar cell devices comprising the ID D5L0A3 and the HTD TPTPA (dashed line) and TPTPA only (solid line) built with 150 nm mesoporous TiO 2 films. Inset: current density–voltage measurements under one sun illumination of the same devices. Figure Legend: From: Hole transporting dye as light harvesting antenna in dye-sensitized TiO2 hybrid solar cells J. Photon. Energy. 2015;5(1):057406. doi:10.1117/1.JPE.5.057406