| Summary: | 碩士 === 國立成功大學 === 材料科學及工程學系 === 104 === Recently, perovskite solar cell has attracted great attentions for use in photovoltaic application due to its direct band gap, high absorption coefficient and high carrier mobility. However, difficulties of pore filling in the TiO2 mesoporous layer has been an issue. As a result, we have investigated the use of TiO2 nanoparticle/nanofiber composite, which provides a porous structure better for the pore filling, for use as an electron transport layer. Added advantages include improved electron transport and reduced recombination. Not only nanoparticle/nanofiber composite but also N-Doped TiO2 is used for photoanode in this study to improve optical properties and cell performance of perovskite solar cells. To the best of our knowledge, this is the first study on Pb-based perovskite solar cell that uses such a porous leyer. Titanium nanofibers were fabricated by electrospinning deposition under various conditions. TiO2 nanofiber characteristics will be examined using the Brunauer-Emmett-Teller technique, UV-visible spectroscopy, scanning/transmission electron microscopy (SEM/TEM), X-ray diffraction (XRD), and XPS. The effect of deposition condition on the characteristics of nanofibers was studied. Desired nanofibers were then mixed with commercial P25 Titania nanoparticles to form a smooth nanoparticle/nanofiber composite film using a spincoating technique. Perovskite layer was deposited on the compisite layer using a two step spin coating process. Perovskite characteristics were examined using UV-Visible spectroscopy, photoluminescene spectroscopy, SEM, and XRD. Finally, photovoltaic characterization was performed under 1 Sun AM 1.5 G simulated sunlight using a Keithley 2400 sourcemeter.
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