University:
Swansea University
Course:
EGA109 | Introductory Organic Chemistry
Academic year:

2023
Views:

317

Pages:

2
Author:

Sanjeev K

Dye Sensitization -Gratzel cell1Sunlight energy (phston of light) passes thereTiO2 layer 4 strikes e's within the adsorbed becomedye molecules. is gain this energy ofexcited because they have extra energy.2. Excited is escape the dye molecules Cy becomefree is These free is more three the TiO Cy 32acamulate at replate (dyed Tiz plate)3. Free is then stant to flow thru external circuitto produce an electric cument. This currentTo complete the circuit, the dye is megeneratedpowers the light bulb.AThe dye regains its lost is from the iodideelectrolyte Iodine I ions are oxidisedloss of 2es to tri-iodide (5). Free is ongraphite plate then reduce the tri-iodidemolecules back to their iodide state.Dye molecules are then reddy for the nextexition orid/ned cycle. Transparent Cy Conductive Substratesubstrate for deposition of SC Cy catalyst,acting also as current collectors.characteristics of substrate:more than 80% transparencyshud have high electrical conductivity7 doped tin oxide (FTO, SnO2 : F) by In dopedtin oxide (ITO,In, O3:Sn) are usually applieda conductive substration DSSCs.These as substrates consist of soda lime glass contedwith 1TO films layers have of ITOCY transmitters F10 780% C1 18 startof sheet resistanceFTO in virable felms region Cy sheet resistance of ranshow a lower tr answittance of 8.5 N 75%Working ElectrodeWE prepared by depositing thin layer Nb2O5, of oxide Ino,semiconducting materials such as Tioz,Sno2 (n-type) of Nio(p-type) on transparent of ITOconducting glan plate made of FTOThese oxides have wide energy bandgap 3-3-2ev.TiO2 mostly used as sconducting layer due to non-taxinity4 easy availability