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Titanium Dioxide Nanomaterials: Synthesis, Properties, Modifications, and Applications

Dye-sensitized solar cells (DSCs) offer the possibilities to design solar cells with a large flexibility in shape, color, and transparency. DSC research groups have been established around the worl ...

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Dye-Sensitized Solar Cells

Excitonic solar cells1—including organic, hybrid organic–inorganic and dye-sensitized cells (DSCs)—are promising devices for inexpensive, large-scale solar energy conversion. The DSC is currently the most efficient2 and stable3 excitonic photocell. Central to this device is a thick nanoparticle film that provides a large surface area for the adsorption of light-harvesting molecules. However, nanoparticle DSCs rely on trap-limited diffusion for electron transport, a slow mechanism that can limit device efficiency, especially at longer wavelengths. Here we introduce a version of the dye-sensitized cell in which the traditional nanoparticle film is replaced by a dense array of oriented, crystalline ZnO nanowires. The nanowire anode is synthesized by mild aqueous chemistry and features a surface area up to one-fifth as large as a nanoparticle cell. The direct electrical pathways provided by the nanowires ensure the rapid collection of carriers generated throughout the device, and a full Sun efficiency of 1.5% is demonstrated, limited primarily by the surface area of the nanowire array.

/pdf/nanowire-dye-sensitized-solar-cells-2cw2kqhfoz.pdf

Nanowire dye-sensitized solar cells

Photoinduced reactivity of titanium dioxide

A photovoltaic cell was fabricated by sandwiching a monolayer of the pigment cyanidin adsorbed on nano-porous n-TiO2 film (deposited on conducting tin oxide glass) within a transparent polycrystalline film of p-CuI, filling the intercrystallite pores of the porous n-TiO2 film. Photoexcited dye is found to inject electrons into n-TiO2 and holes into p-Cul, generating photocurrents and photovoltages that are impressively high for a dye-sensitized solid-state photovoltaic cell.

https://iopscience.iop.org/article/10.1088/0268-1242/10/12/020/pdf

A dye-sensitized nano-porous solid-state photovoltaic cell

An efficient dye-sensitized photoelectrochemical solar cell made from oxides of tin and zinc

Deposition of CuI on dyed nanoporous TiO2 films from a solution containing a crystal growth inhibitor enables filling of the pores. This technique improves the performance of dye-sensitized solid-state cells based on CuI.

Dye-Sensitized Solid-State Solar Cells: Use of Crystal Growth Inhibitors for Deposition of the Hole Collector

Dye-sensitized solar cell with the hole collector p-CuSCN deposited from a solution in n-propyl sulphide

Ruthenium bipyridyl complexes have been used as efficient sensitizers for photoelectrochemical cells based on nano-porous films of . It is found that cis-dithiocyanate-bis(2,2-bipyridyl-4,4-dicarboxylate) ruthenium (II) can be used as the sensitizer in a solid-state photovoltaic cell in which a monolayer of the sensitizer is sandwiched between nano-porous n- and p-CuI. The data on performance of the cell and the problems encountered in construction of dye-sensitized solid-state photovoltaic cells are described.

https://iopscience.iop.org/article/10.1088/0022-3727/31/12/014/pdf

Kirthi Tennakone

Papers

A dye-sensitized nano-porous solid-state photovoltaic cell

An efficient dye-sensitized photoelectrochemical solar cell made from oxides of tin and zinc

Dye-Sensitized Solid-State Solar Cells: Use of Crystal Growth Inhibitors for Deposition of the Hole Collector

Dye-sensitized solar cell with the hole collector p-CuSCN deposited from a solution in n-propyl sulphide

A solid-state photovoltaic cell sensitized with a ruthenium bipyridyl complex