Construction of Gratzel Cells

Construction Gratzel cell A range of organic dyes are used eg Ruthenium - Poly pyridine, Indoline dye as metal free organic dye Extracted from foods such as hibisus tea, tinned summer fruisly blackberries 2 Construction transparent glan places are pertorated of on a one side with trans parent thin layer conducting material Once plate conted with graphite Cy other A lye in then adsorbed onto the TiO2 solution layer by of with TiQ2. immersing the plate into a dye 10-m Plates are in then canefully sandwiched together Cy alcohol for 10 min (approx). To complete the cell a drop of (odide electiolyte secured using paper clip is added b/w plates. Working basic Principle DSSC light absorption, e injection, current transportation Four steps: of carrier Cy collection of Sunlight energy (photon of light passes thru TiQ layerly absorbed by

Due to photon absorption, is get promoted from ground state (dye) to excited state (Dyey of dye - Exated is with lifetime of nanogla range are injected into conduction band of nano - porous TiO2 electrode which his below excited state of dye. As a result, the dye gets oxidized Dye. + hv Dye" A Dye Dye * + + (TiQ2) Advantages Works at wider Ls cin low light Long life. Good price/performance ratio Low cost Mechanical Robustness - Lowers electricity bills Operates at lower internal temperatures. Disadvantages DSSC design is the use of liquid electr olyte. which has temp stability problems Costly f athenium (dye) / Pt (catalyst) electrolyte soln contains volatile organis compounds (or voc's)