Table of Contents
The working principle of DSSC involves four basic steps: light absorption, electron injection, transportation of carrier, and collection of current. The following steps are involved in the conversion of photons into current (as shown in Fig.
Which dye is used in DSSC solar cell?
Setup of a Dye Solar Cell The anode of a DSC consists of a glass plate which is coated with a transparent conductive oxide (TCO) film. Indium tin oxide (ITO) or fluorine doped tin oxide are most widely used. A thin layer of titanium dioxide (TiO2) is applied on the film.
How are the electrons produced in a DSSC?
The action of the DSSC begins with the generation of photoexcited electrons in the dye molecules by the absorption of irradiation. Subsequently, the electrons are transferred into the metal oxide and collected by the conductive film on the glass plate [5].
How can you increase the efficiency of a dye sensitized solar cell?
To improve the efficiency of dye-sensitized solar cells (DSSCs),light absorption properties of organic dye must be tuned to have a maximum response throughout visible and near infra-red spectrum.
What is the role of electrolyte in dye sensitized solar cells?
The electrolyte is one of the most crucial components in DSSCs; (36) it is responsible for the inner charge carrier transport between electrodes and continuously regenerates the dye and itself during DSSC operation.
What are dye sensitized solar cells made from?
A modern n-type DSSC, the most common type of DSSC, is composed of a porous layer of titanium dioxide nanoparticles, covered with a molecular dye that absorbs sunlight, like the chlorophyll in green leaves. The titanium dioxide is immersed under an electrolyte solution, above which is a platinum-based catalyst.
Why TiO2 is used in DSSC?
TiO2 is used because it shows all the good things required for DSSCs. Other materials such as ZnO, SnO2, Nb2O5, WO3 etc. are also used. TiO2 wide used in DSSC because thier wide band gap , cheap, non toxic as well as the preparation not complicated and easily to combined with other metal oxide or dopent .
Which semiconductor material is mostly used in dye sensitized solar cells?
So far, ruthenium complexes and porous TiO2 have mostly been used as sensitizers and the semiconductor, respectively, in dye-sensitized solar cells [6].
What is VOC in DSSC?
Open-Circuit Voltage (VOC) Enhancement in TiO2-Based DSSCs: Incorporation of ZnO Nanoflowers and Au Nanoparticles.
What is the meaning of dye sensitized?
noun Photography. the producing of panchromatic or orthochromatic film by treating it with an emulsion containing dyes that absorb light of all or certain colors.
What is a silicon solar cell?
The basic component of a solar cell is pure silicon, which has been used as an electrical component for decades. In a solar cell, the layers are positioned next to each other and that way an electric field is created. When the sunlight hits the solar cell, the energy stimulates electrons that leave holes behind.
What is the light harvesting efficiency?
Natural light harvesting complexes have molecular machinery that make possible the conversion of sunlight into chemical energy with almost 100% quantum efficiency.
What is perovskite made of?
Perovskite is a mineral composed of calcium titanium oxide (CaTiO2) discovered by a Russian scientist, Gustav Rose, in 1839 and the research was further carried out by Russian mineralogist Lev Perovski therefore this mineral was named as Perovskite.
What component in the solar cell provides electrons to replace the electrons released by the dye?
This carbon-coated glass acts as our counter electrode, the electrode which provides a balancing flow of electrons into the solution as they are removed from solution by the dye and TiO2.
Is Iodine an electrolyte?
Iodine (I2) is an example of a non-electrolyte. This is a purple-black solid at room temperature.
When was the DSSC invented?
Dye-sensitized solar cells (DSSC) are an efficient type of thin-film photovoltaic cell. Modern dye-sensitized solar cells, or Grätzel cells, are based on a concept invented in 1988 by Brian O’Regan and Michael Grätzel, but the concept dates back to the 1960s and 70s.
What is dry and solar cell?
A dry cell converts chemical energy into electrical energy while a solar cell converts solar energy into electrical energy.
How is TiO2 used in solar cells?
We used TiO2 as an active material that absorbs photons and converts them into electric current. This material has a band gap around 3.2–3.8 eV, allowing the effective absorption of ultraviolet light. Only a few electron–hole pairs are produced when the material is illuminated by the solar spectrum.
How does nanocrystalline dye-sensitized solar cell resemble photosynthesis?
Nanocrystalline dye-sensitized solar cells is a photoelectrochemical cell that resembles natural photosynthesis in two respects: 1. It uses a natural dye like chlorophyll to absorb light and produce a flow of electrons, and 2.
Which material is used as redox mediator in Dssc?
References (68) 11 Iodide/triiodide is the most prominent redox couple due to its properties that can produce a stable and efficient DSSC. 12 The efficiency of the DSSC is dependent on the open-circuit voltage (V oc ) and short-circuit current density (J sc ) of the cell.
How do you select semiconducting materials for solar cells?
Ideal semiconducting material for DSC application must possess the following properties:(i)wide band gap,(ii)high electron injection rate,(iii)low cost,(iv)high carrier concentration,(v)low static dielectric constant,(vi)high electron mobility.
How does a semiconductor behave at absolute zero?
At or close to absolute zero a semiconductor behaves like an insulator. When an electron gains enough energy to participate in conduction (is “free”), it is at a high energy state. When the electron is bound, and thus cannot participate in conduction, the electron is at a low energy state.
Which is used as a counter electrode in DSSC?
One dimensional nanostructures such as nanorods, nanobelts, nanowires and nanofibers are found to be an effective counter electrode for DSSC, as it poses large surface area and efficient charge transport due to the interconnected structure.
