Recently, dye-sensitized solar cells have attracted much attention relevant to global environmental issues. Thus far, ruthenium(II) bipyridyl complexes proven be the most efficient TiO(2) sensitizers in cells. However, a gradual increment highest power conversion efficiency has been recognized past decade. More importantly, considering that ruthenium is rare metal, novel dyes without metal or using inexpensive are desirable for highly Large pi-aromatic molecules, such as porphyrins,...

Abstract Redox‐active fullerenes can be covalently bound to a variety of donors, their photophysical properties have been investigated. Their photochemical processes. Including electron transfer and energy transfer, are varied, depending on the donor, linkage between donor C 60 , solvent. Regardless solvent linkage, charge‐separated state is produced efficiently in zinc porphyrin‐C systems, showing that 6o good acceptor. The most intriguing characteristic accelerates photoinduced charge...

Dye-sensitized solar cells (DSSCs) have attracted much attention as an alternative to silicon-based because of their low-cost production and high power conversion efficiency. Among various sensitizers, numerous research activities been focused on porphyrins due strong absorption bands in the visible region, versatile modifications core, facile tuning electronic structures. In 2005-2007, Officer Grätzel et al. had achieved a rapid increase efficiency porphyrin DSSCs from few percent 7%....

Photoinduced charge separation (CS) and recombination (CR) processes have been examined in various porphyrin−fullerene linked systems (i.e., dyads triads) by means of time-resolved transient absorption spectroscopy fluorescence lifetime measurements. The investigated compounds comprise a homologous series rigidly linked, linear donor−acceptor arrays with different separations diversified donor strength: freebase porphyrin−C60 dyad (H2P-C60), zincporphyrin−C60 (ZnP-C60),...

An extremely long-lived charge-separated state has been achieved successfully using a ferrocene-zincporphyrin-freebaseporphyrin-fullerene tetrad which reveals cascade of photoinduced energy transfer and multistep electron within molecule in frozen media as well solutions. The lifetime the resulting (i.e., ferricenium ion-C(60) radical anion pair) benzonitrile is determined 0.38 s, more than one order magnitude longer any other intramolecular charge recombination processes synthetic systems,...

Abstract We have developed a novel strategy for the construction of molecular photovoltaic devices where porphyrins and fullerenes employed as building blocks are organized into nanostructured artificial photosynthetic systems by self‐assembly processes. Highly efficient energy‐ electron‐transfer processes take place at gold indium tin oxide (ITO) electrodes modified with self‐assembled monolayers porphyrin‐ or fullerene linked systems. Porphyrins also been assembled step to make large...

Novel organic solar cells have been prepared using quaternary self-organization of porphyrin (donor) and fullerene (acceptor) units by clusterization with gold nanoparticles on nanostructured SnO2 electrodes. First, porphyrin-alkanethiolate monolayer-protected (H2PCnMPC: n is the number methylene groups in spacer) are (secondary organization) starting from primary component (porphyrin-alkanethiol). These porphyrin-modified form complexes molecules (tertiary organization), they clusterized...

Three different kinds of mixed self-assembled monolayers have been prepared to mimic photosynthetic energy and electron transfer on a gold surface. Pyrene boron-dipyrrin were chosen as light-harvesting model. The pyrene (or boron-dipyrrin) porphyrin (energy acceptor model) reveal photoinduced singlet-singlet from the has also combined with reaction center model, ferrocene-porphyrin-fullerene triad, construct integrated artificial assemblies electrode using respective unit. established...

Four different kinds of C60-linked zincporphyrins have been prepared by changing systematically the linking position at meso-phenyl ring from ortho to para and their photophysical properties investigated. Regardless linkage between two chromophores, photoinduced charge separation (CS) subsequent recombination (CR) were observed in a series zincporphyrin-C60 dyads picosecond fluorescence lifetime measurements time-resolved transient absorption spectroscopy. In THF CS occurs both excited...

Phospholes are known to exhibit characteristic optical and electrochemical properties derived from the phosphorus-bridged 1,3-dienic π system. Particular interest has recently been paid their π-conjugated derivatives, such as non-fused phospholes, dibenzo[b,d]phospholes, benzo[b]phospholes, benzo[c]phospholes related compounds. This perspective focuses on recent advances in synthesis of these phosphole-based systems with representative examples that would give valuable guidelines for...

Over the last decades, porphyrin sensitizers have made a remarkable contribution to performance improvement in dye-sensitized solar cells (DSSCs). In particular, versatile push-pull-type achieved power conversion efficiencies (η) over 10% as result of their improved light-harvesting abilities. Meanwhile, aromatic ring fusion core is an attractive option for highly efficient DSSCs because its expanded π-conjugation and resultant red-shifted absorption. Nevertheless, aromatic-fused suffered...

Photoconductivity is a characteristic property of semi-conductors. Herein, we present photo-conducting crystalline metal-organic framework (MOF) thin film with an on-off photocurrent ratio two orders magnitude. These oriented, surface-mounted MOF films (SURMOFs), contain porphyrin in the backbone and C60 guests, loaded pores using layer-by-layer process. By comparison results obtained for reference structures based on DFT calculations, conclude that donor-acceptor interactions between host...

Solar energy conversion is one of the most important issues for creating and maintaining a future sustainable society. In this regard, photovoltaic technologies have attracted much attention because their potential to solve environmental issues. particular, thin-film solar cells, such as organic photovoltaics (OPVs) perovskite cells (PSCs), are highly promising owing flexibility, light weight, low-cost production. One factors used evaluate solar-cell performance power efficiency (PCE), which...

Dyes play a crucial role in the cell performance of dye-sensitized solar cells (DSSCs), and versatile synthetic strategies towards well-tailored porphyrins for DSSCs have been developed achieving high photovoltaic performances.

A novel molecular triad, representing an artificial reaction center, was synthesized via linking a fullerene moiety to array of two porphyrins (i.e., zinc tetraphenyl porphyrin (ZnP) and free base (H2P)). In this ZnP−H2P−C60 the ZnP performs as antenna molecule, transferring its singlet excited state energy energetically lower lying H2P. benzonitrile, transfer (k = 1.5 × 1010 s-1) is followed by sequential electron-transfer relay evolving from generated H2P yield ZnP−H2P•+−C60•- subsequently...

Synthetic giant multiporphyrin arrays with well-defined architectures are reviewed in terms of artificial light-harvesting materials. Meso,meso-linked porphyrin and dendrimers have successfully mimicked the function bacterial photosynthetic systems. We also developed novel multiporphyrin-modified metal nanoclusters where porphyrins employed as a unit well organized onto by self-assembly processes. Multiporphyrin-modified been applied to photocatalyses photovoltaic cells. In particular, they...

Both charge-transfer absorption and emission have been observed in porphyrin-linked fullerene where the C60 moiety is closely located on porphyrin plane. Electron-transfer parameters including reorganization energies, free energy changes, electronic coupling matrix elements were determined by analyzing benzene. The estimated as 0.23 ± 0.11 eV, which smallest value among inter- intramolecular donor−acceptor systems ever reported comparable to ones for primary charge separation photosynthetic...

Novel perylene imide derivatives with both electron-donating and bulky substituents have been synthesized for dye-sensitized solar cells. The power conversion efficiency reached 2.6%, which is the highest value among perylene-sensitized TiO2

A systematic series of ITO electrodes modified chemically with self-assembled monolayers (SAMs) porphyrins and porphyrin−fullerene dyads have been designed to provide valuable insight into the development artificial photosynthetic devices. First gold SAMs a spacer same number atoms were prepared compare effects energy transfer (EN) quenching porphyrin excited singlet states by two electrodes. Less EN was observed on electrode as compared corresponding electrode, leading remarkable...