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Title page for etd-0824117-195726


URN etd-0824117-195726 Statistics This thesis had been viewed 245 times. Download 0 times.
Author Hsiao-shan Peng
Author's Email Address No Public.
Department Chemical Engineering
Year 2016 Semester 2
Degree Master Type of Document Master's Thesis
Language English Page Count 75
Title Electrodeposition of titanium dioxide thin films for photoanodes in perovskite solar cells
Keyword
  • perovskite
  • thin film
  • Titanium dioxide
  • electrodeposition
  • perovskite solar cell
  • perovskite solar cell
  • electrodeposition
  • Titanium dioxide
  • thin film
  • perovskite
  • Abstract In this work, we demonstrated a low-cost and facile process of electrodeposition to prepare TiO2 thin films for modifying the as-prepared blocking layer (BL) and functionalizing the porous layer (PL) of photoanodes in perovskite solar cells (PSCs). The as-prepared TiO2 thin films as photoanodes in PSCs were characterized with field emission-scanning electron microscopy, cyclic voltammetry and photovoltaic tests. Firstly, we investigated the effects of TiCl4 post-treatment and galvanostatic deposition (GD) to modify the pin holes in the as-prepared TiO2 BLs. It was found that the peak current inhibition can be decreased to 0.825 by the blocking effect while the TiO2 porous layer was deposited by GD mode for 800s. The PSC based on the TiO2 layer prepared under the optimal current density showed the power conversion efficiency (PCE) of 12.38%, which was higher than those of the PSCs assembled with the TiO2 porous layer prepared by conventional spin coating preparation (12.14%). The higher cell efficiency of the PSC with GD-deposited TiO2 porous layer can be ascribed to its improved open circuit voltage (1.05V). Since a compact thin TiO2 layer can be directly deposited on the exposed surface of conductive oxide layer, the pin-hole remaining on conductive oxide layer can therefore be modified. To further improve the porosity or surface area of the GD-deposited TiO2 layer, we employed a soft template (Brij 58) in the deposition bath. It can be observed that the rice-like TiO2 thin film was constructed in the presence of Brij 58. The PCE of the PSC based on the GD-deposited TiO2 porous layer was remarkably enhanced from 12.38% to 13.09% while the Brij 58 was introduced into the deposition bath. The enhancement in the PCE can be ascribed to the significantly increased its photocurrent density (from 16.78 to 18.51 mA cm−2) due to the increased of surface area.
    Advisor Committee
  • Jeng-Yu Lin - advisor
  • Chih-Yu Chang - co-chair
  • Tsung-Wu Lin - co-chair
  • Tzu-chien Wei - co-chair
  • Files indicate not accessible
    Date of Defense 2016-07-28 Date of Submission 2017-09-14


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