Photosensitization of Nanocrystalline ZnO Films by Bis(2,2‘-bipyridine)(2,2‘-bipyridine-4,4‘-dicarboxylic acid)ruthenium(II)

Abstract

Spectral sensitization of nanocrystalline ZnO films has been carried out with ruthenium complex, bis-(2,2′-bipyridine)(2,2′-bipyridine-4,4′-dicarboxylic acid) ruthenium(II) or (Ru(II)). An incident photon to current conversion efficiency (IPCE) of 14% has been obtained for unbiased ZnO/Ru(II) photoelectrochemical cells. This low IPCE has been attributed to the poor light harvesting efficiency (LHE) and charge collection (η c) efficiency. The weak interaction between Ru(II) and ZnO surface which results in poor uptake of Ru(II) on ZnO is responsible for a lower LHE while various charge recombination processes are the cause of poor ηc. To better understand the process of photosensitization of ZnO by Ru(II), the dependence of IPCE and fluorescence on applied bias, and other photoelectrochemical measurements have also been carried out.

Advances in Liquid‐Electrolyte and Solid‐State Dye‐Sensitized Solar Cells

“…iv) Films fabricated from the material need to deliver the surface area multiplicity necessary for efficient light harvesting from a monolayer of surface adsorbed dye. Some examples that have been employed are ZnO, [117][118][119][120] SnO 2 [121,122] and SrTiO 3 . [123] It has been found that the electron transport properties of DSCs fabricated using ZnO sintered nanoparticles are similar to those of TiO 2 .…”

Anchoring ZnO Particles on Functionalized Single Wall Carbon Nanotubes. Excited State Interactions and Charge Collection

“…These mesoscopic films of metal oxide semiconductors provide a high surface area and porous structure. Such ZnO films have been extensively employed in the construction of dye-sensitized solar cells [44][45][46][47] Images C and D in Figure 5 show f-CNT-ZnO composite under two different magnifications. Two different type of ZnO attachment can be seen from the micrographs in Figure 5C and D. In the first case aggregated clusters of ZnO crowd around the f-CNT bundles (Fig.…”

Dióxido de estanho nanoestruturado: síntese e crescimento de nanocristais e nanofitas

“…As atividades de pesquisas relacionadas a esta área foram impulsionadas pela habilidade para controlar as propriedades dos materiais através do controle do tamanho das partículas. Este desenvolvimento pode resultar em novas tecnologias, inclusive conversão de energia [19][20][21][22][23] , armazenamento de dados em altíssima densidade 24 , diodos emissores de luz (LED) 25 e pigmentos especiais 26 .…”

“…As atividades de pesquisas relacionadas a esta área foram impulsionadas pela habilidade para controlar as propriedades dos materiais através do controle do tamanho das partículas. Este desenvolvimento pode resultar em novas tecnologias, inclusive conversão de energia [19][20][21][22][23] Neste trabalho apresenta-se uma abordagem inicial sobre materiais nanoestruturados, em especial o dióxido de estanho, envolvendo alguns aspectos básicos. Versa-se sobre a técnica de obtenção deste composto pelo método químico e o controle do crescimento de partículas através de uma solução sólida supersaturada.…”