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Product Code: ICAL09_N201

Excimer Laser Annealing of TIO2 Nanoparticles For Dye Sensitized Solar Cells (Invited Presentation, 20 minutes)
Heng Pan, University of California - Berkeley; Berkeley CA USA
Seung H. Ko, Uc-Berkeley; Berkeley CA USA
Costas Grigoropoulos, Uc-Berkeley; Berkeley CA USA
Presented at ICALEO 2009

Metal oxide nanoparticle have been considered promising for realizing low cost printable high performance electronics. It is shown in this paper the application of laser for annealing ZnO and TiO2 nanoparticle for device fabrication. Solution deposited and laser annealed zinc oxide nanoparticle thin film field effect transistors have been fabricated without using conventional vacuum or any high temperature thermal annealing processes. Laser processing is also demonstrated to fabricate composite TiO2 electrodes for dye-sensitized solar cells (DSSCs) on glass and plastics by in-tandem spray deposition and laser annealing. The produced TiO2 film is crack free and contains small particles (30nm) mixed with different fractions of larger particles (100-200nm) controlled by the applied laser fluence. Laser annealed double-layered structure is demonstrated for both screen-printed and spray-deposited electrodes and performance enhancement can be observed. The highest demonstrated all-laser-annealed cells utilizing Ruthenium dye and liquid electrolyte showed a power conversion efficiency of ~3.8% under simulated illumination of 100mW/cm2.

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