Molecular and supramolecular sensitization of nanocrystalline wide band-gap semiconductors with mononuclear and polynuclear metal complexes

Electrochemical and Photophysical Properties of Ruthenium(II) Bipyridyl Complexes with Pendant Alkanethiol Chains in Solution and Anchored to Metal Surfaces

“…Consequently, the attachment of photoactive molecules to metal surfaces to develop molecular devices [15][16][17][18][19], nanowire transitor [20,21], sensors [22,23] or photovoltaic systems, able to mimic natural light harvesting and charge separation [24][25][26][27] step for the development of electroluminescent devices or high-density sensor arrays.…”

Sevenfold enhancement on porphyrin dye efficiency by coordination of ruthenium polypyridine complexes

“…Also, the open circuit photovoltage increased from about 0.37 V to 0.41 and 0.50 V suggesting the occupation of higher TiO 2 conduction band energy levels as the flux of injected photoelectrons was increased. 16 Since the optical density of the cells were similar for the cells prepared with the conventional and ruthenated porphyrins, a sevenfold enhancement on Z (from 0.11 to 0.77 and 0.17 to 1.2%, respectively) was achieved as a consequence of coordination of [Ru(dmbpy) 2 Cl] + complexes to the parent MCTPyP and Zn-MCTPyP porphyrin dyes (Fig. 2).…”

“…6 However, increasingly higher values of Z have been gradually achieved with new porphyrin dyes [7][8][9] and, very recently, a special combination of porphyrin dye/[Co(bpy) 3 ] electrolyte system was reported, surpassing the two-decade long 11% efficiency threshold. 10 Many efforts have been focused on innovative strategies to improve the efficiency of photosensitizers using the supramolecular approach [11][12][13][14] since Bignozzi et al, 15,16 demonstrated the concept, using a trinuclear ruthenium polypyridyl complex. Subsequently, many linear, branched and star shaped porphyrin arrays were reported, but exhibiting no significant antenna effect.…”

Homoleptic tetraazaphenanthrene-based copper(I) complexes: Synthesis, spectroscopic characterization, crystal structures and computational studies

“…The homoleptic complexes 1-3 formed immediately after mixing the solution of [Cu(CH 3 CN) 4 ]PF 6 and the corresponding ligands , displayed two strong bands at 836 and 557 cm À1 for both 1 and 2 and at 840 and 556 cm À1 for 3 that can be attributed to the hexafluoridophosphate anion [51]. The electronic absorption spectra of complexes 1 and 2, recorded in CH 2 Cl 2 solution in the range 250-600 nm (Fig.…”

“…There has been much interest over the past two decades in emissive coordination complexes of the transition metal elements with a focus on their applications as photosensitizers in solarenergy conversion [1,2], in display devices [3], in phototherapy [4], as photo-catalysts [5], and as dopants to increase the efficiency of organic light emitting diodes (OLED) [6][7][8]. In this regard, first row transition metal complexes are potentially useful, being considered inexpensive, being less toxic, displaying a greater ease of synthesis, and are more abundant when compared to the thirdrow noble metal complexes.…”