| 학회 | 한국재료학회 |
| 학술대회 | 2012년 가을 (11/07 ~ 11/09, 라카이샌드파인 리조트) |
| 권호 | 18권 2호 |
| 발표분야 | C. 에너지/환경 재료(Energy and Environmental Materials) |
| 제목 | Effect of the surface treatment of TiO2 electrode on the performance of dye-sensitized solar cell |
| 초록 | Dye-sensitized solar cells (DSSCs) work under the principle of sensitization known as Gratzel cells, which entails decoupling of the charge transport and light absorption in a solar cell. DSSCs based on nanoporous TiO2 electrodes are of increasing interest because of their low cost and impressive efficiencies. However, nanoporous TiO2 is not perfect yet due to the close proximity of electrons and holes, indicating that interfacial charge recombination still remains to be one of the major energy-wasting pathways. In this work, we report on the fabrication and characterization of DSSCs based on MnTiO3-treated nanoporous TiO2 electrodes. Nanoporous TiO2 films were prepared from colloids with particles of Degussa P25 and fabricated on transparent conducting glass (F-doped SnO2) using a screen printing method, followed by calcinations at 500℃ for 1 hr. To fabricate the surface modified MnTiO3/TiO2 electrodes, the films are dipped into a mixture of 0.2M MnCl2 and TiCl4 aqueous solutions for 30 min, washed with water, and then sintered in air at 500 ℃ for 30 min. After that, the films are placed into a 0.5mM ethanolic solution of N719 for 24 hrs at room temperature. The dye-sensitized electrodes were then rinsed with ethanol after taking out from the dye solution. Comparison of DSSCs with and without MnTiO3 treatment shows that after MnTiO3 treatment, the open-circuit voltage (VOC), the short circuit current (JSC), and the fill factor are increased from 0.65 to 0.72 V, 11.8 to 13.0 mA/cm2, and 0.55 to 0.57, respectively. As a result, the cell efficiency (η) is improved from 4.29 to 5.37 %. The MnTiO3 treatment on the TiO2 surface is believed to form an energy barrier against the electron transfer from TiO2 to electrolyte. The energy barrier could increase electron density in the TiO2 electrode by increasing electron life time, consequently resulting in the increase in VOC. |
| 저자 | Kon-Nara Bae1, Hyo-Jin Ahn2, Tae-Yeon Seong1 |
| 소속 | 1Korea Univ., 2Seoul National Univ. of Science and Technology |
| 키워드 | Dye sensitized solar cell; surface treatment |
