The Application of Self-Assembled Monolayer of Quantum-Dots in Dye-Sensitized Solar Cells

• Main Authors: Bau-Ming Huang, 黃保銘
• Other Authors: Yuh-Lang Lee
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/17978220235968893038

碩士 === 國立成功大學 === 化學工程學系碩博士班 === 96 === In this study, cadmium sulfide and cadmium selenide quantum dots (CdS and CdSe QDs) were used as sensitizers for QD-sensitized Solar cells (Q-DSSCs) applications. Colloidal CdS QDs were first self-assembled on the TiO2 surface using bifunctional linker molecules, followed by chemical bath deposition (CBD) to replenish the incorporated amount of QDs. The self-assembled layer of CdS QD (SAM CdS QDs) plays a role to induce the growth of CdS or CdSe in the following CBD process, anticipating to attain a well-covered QDs layer on TiO2 surface. The results show that, if 3 layers of QDs were directly deposited by CBD without the presence of SAM CdS QD, the efficiency measured for the QD-DSSC were 0.63% and 0.95%, respectively, for CdS and CdSe. At the presence of a SAM CdS QD layer, the efficiencies of CdS and CdSe devices increase to 1.07% and 1.98%, respectively. These results showed that the SAM CdS QD layer can help formation a well-covered layer which has superior ability in inhibiting the recombination of charges at the interface. Comparison between TiO2/Q-CdS SAM/CdS and TiO2/Q-CdS SAM/CdSe, the latter had a higher efficiency due to its broader light-absorption range. If zinc sulfide (ZnS) is further deposited on a TiO2/Q-CdS SAM/CdSe electrode as a passivation layer of QDs, the cell efficiency can be increased to 2.89%.