Binder-Free Pastes Fabricated from Sol-Gel-Derived TiO2 by Ammonia Addition for Low-Temperature Photoelectrodes

作者：Oh Byeong Yun; Jang Jaewon; Heo Gi Seok; Ki Hyun Chul; Ham Moon Ho^*

来源：Science of Advanced Materials, 2014, 6(11): 2496-2500.

DOI：10.1166/sam.2014.2233

• Dye-Sensitized Solar Cell
• Binder-Free Paste
• TiO2 Nanoparticles
• Low Temperature
• Ammonia Water

To obtain high-efficiency dye-sensitized solar cells (DSSCs) on plastic substrates, we used a viscous, binder-free TiO2 paste composed of TiO2 nanoparticles and ammonia water that is processable at low temperatures. Nanocrystalline, spherical anatase TiO2 colloids were synthesized with narrow size distributions (similar to 20 nm) using a hydrothermal method and were transformed to a binder-free TiO2 paste when ammonia water was added to the solution. This process results from the flocculation of the TiO2 nanoparticles by CH3COO- and NH4+ ions. The high loading (20 wt%) of TiO2 nanoparticles in the solution resulted in a viscous TiO2 paste despite the addition of a small amount of ammonia (0.015 wt%), which enabled the formation of uniform, thick, mesoporous TiO2 films without aggregates. Using this approach, we achieved an energy conversion efficiency of 3.38% in the DSSC when using an 8-mu m-thick mesoporous TiO2 film that was dried at 150 degrees C without any additional treatment.

• 出版日期2014-11