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Graetzel Solar Cell

Graetzel Solar Cell. Michael Grätzel. 11 May 1944, Dorfchemnitz ,  Germany . He is a professor at the  École Polytechnique Fédérale de Lausanne where he directs the Laboratory of Photonics and Interfaces .

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Graetzel Solar Cell

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  1. GraetzelSolarCell

  2. Michael Grätzel 11 May 1944, Dorfchemnitz, Germany. Heis a professor at the ÉcolePolytechnique Fédérale de Lausannewherehedirects the LaboratoryofPhotonics and Interfaces. He discovered a new type of solar cell based on dye sensitized mesoscopic oxide particles and pioneered the use of nanomaterials in lithium ion batteries.

  3. A solar cell uses light from the sun to produce electricity. Using simple materials we can make a type of solar cell called a dye-sensitised solar cell. This type of cell is cheaper than other solar cells, and is now produced commercially.  It is based on a semiconductor formed between a photo-sensitized anode and an electrolyte, a photoelectrochemical system

  4. Making a solarcell To make a solar cell we will prepare two halves of the cell and then put them together. One half of the cell is called a ‘working electrode’ and the other half is called a ‘counter electrode.’

  5. Materials GeneralMaterials • Scotch Tape • Beakerof water • Papertowels • Smallbeaker • 2B pencil • Tweezers • Sparebeaker • 2 paperclips • Torch • Multimeter • 2 crocodile clip leads • Scalpel

  6. Materials Chemicals and specialitymaterials: • 2 FTO slides • Titaniapaste • Blueberries • Peelofeggplants • Hibiscusflowers • Alcohol • Iodinesolution The materials we are going to use today are not dangerous.

  7. Step 1: Checking which side of the glass is conducting • The electrodes are prepared using special glass. The glass is coated on one side with Titania paste, a material which conducts electricity. Therefore, only one side of the glass conducts electricity. • Remember to hold the glass by the edges as much as possible so that you don’t damage the surface of the glass.

  8. 1. Set the multi-meter to 2000 Ω. 2. Touch each side of the transparent glass with both ends of the two probes connected to the multi-meter and decide which side of the glass is conducting. If the value stayed at 1 the side of the glass is not conducting.

  9. Step 2: CoatingglasswithTitania paste Now we should cover a side of the other glass with the Titania paste using a spatula, then put the glass on a hot plate to let dry the paste. However this is a very time demanding operation and we will use pre-coated glass (the white one)

  10. Step 3: The glass in the beaker • Wehavebeakerswithdifferentkindofcompounds: 1: Alcohol + Blueberries 2: Alcohol + Peelofeggplants 3: Alcohol + Hibiscusflowers 4: Mixtureof 1,2,3 Now put the whiteglassintoonebeaker. The darker the compoundis, the more light the cellwillabsorb.

  11. Step 4: Sealingwith scotch tape • Using scotch tape and a scalpelmakesuretosealsidesof the transparentglass. • Makesureto cover with scotch tape the conducting side.

  12. Step5: Recover the glass in the beaker • Using a tweezerrecover the whiteglassinto the beaker

  13. Step 6: The composition • Put the whiteglass on a papertowelwith the white side up. • Put the conducting side of the transparentglass on it. Leave a space at each side and lockthemusing a clip-

  14. Step 7: Adding the iodinesolution • It’s timetoadd the iodinesolution. Allow the iodine solution to penetrate completely between the glass slides. This operation may last some minutes, don’t try to quicken it by adding more solution.

  15. Step 8: It’s timetocheck! • Nowoursolarcellisready. Wehavetotryitbyusing the multimeter. Connectcrocodileclipsto the solarcell and to the multimeter. • Set the multimeterto 2V

  16. Itworks! • Ifeverything’s okay thenourcellwill work properly. Tryto light it up withdifferentkindoflights: 1: Solar Light 2: Yellow Torch Light 3: White Torch Light (as the oneof mobile phones) The solarcellwillreact in differentways. Ifyoutryto cover itwith a papertowelyouwillsee a decreaseofvalues on the multimeter.

  17. Byconnnecting more solarcellstogetheryouwillbeabletopowersmallelectricaldevices, suchas a calculator. Solarcellsmay last some days or evenmonths, itdepends on howwellthey are made and on howthey are preserved.

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