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Die-sensitized Solar Cells

Die-sensitized Solar Cells. Mohvir Singh Brar Chem C185 Lab Professor: Dr. Duan TA’s: Boris Volosskiy Ben Lesel Jonathan Caplette Shaw Mufan Li. Motivation and Purpose. Incident light comes in and excites from VB to CB. Excited move through TiO 2 network.

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Die-sensitized Solar Cells

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  1. Die-sensitized Solar Cells Mohvir Singh Brar Chem C185 Lab Professor: Dr. Duan TA’s: Boris Volosskiy Ben Lesel Jonathan Caplette Shaw Mufan Li

  2. Motivation and Purpose • Incident light comes in and excites from VB to CB. Excited move through TiO2 network. • TCPP dye will absorb incoming light. Electrolyte solution in middle of cell helps recombine holes and complete regeneration of dye • Cheap and simple alternative to Si based solar cells in some applications Dye

  3. Procedure • Cut ITO and prepare for furnace by spreading titaniananocrystal paste which will form the • network • Soaked in TCPP dye which will absorb incoming light • Pt sputtered counter electrode placed on top of soaked electrode with electrolyte solution in middle which helps recombine holes • Source meter and flashlight used to help test devices

  4. Periodic light flashed on solar cell Light source On Light source Off • Ideally, graph would show step-wise behavior indicating sharp electrical response • Could be that paste was too thick  when heated led to cracking due to stress • Defects cause networked Ti to dislocate  recombine  fluctuations in current as seen above

  5. Effects of visible spectrum • White light most efficient and generated the most power

  6. Absorption spectra for solar cell components • Titania solution be expected to red shift -> shift right and down in the visible region due to the dye color • Difficulties presented were getting titania in region where light source hit cuvette

  7. Possible Additional Improvements • Electrolyte solution crystalized in between lab periods. Also, appeared darker in color. After, double checking calculations, the electrotype was prepared correctly on paper. • Mistakes could have been made weighing out KI and I2, which would limit amount of light that passes through device if too much added.

  8. Take Home Message • How: excites TCPP  injected into CB of TiO2 move through circuit to counter electrode for oxidation  dye restored • Why? Dye sensitized solar cells are cheap and can be made without expensive semiconductor purification processes

  9. Acknowledgments • Thank you Ben, Boris, Jonathan and Mufanfor allowing us to use the other lab section to complete this experiment.

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