| 초록 |
One of main loss factors in dye-sensitized solar cells is recombination reactions of photo-induced electron with redox species such as oxidized dyes or triiodide. To prevent recombination reactions many treatments at the interfaces have been attempted, encapsulation of TiO2 particles with insulated thin layers, lithium ions-doped hole transport materials, and introduction of co-adsorbents. Co-adsorbents act as hydrophobic energy barriers, decreasing recombination reactions at the interfaces. However, it is little studied that how co-adsorbents can compete with dyes in anchoring processes. We studied several co-adsorbents and their anchoring mechanism. We observed that amounts of anchored co-adsorbents are dependent on their polarities and sizes, influencing Fermi level of TiO2 nano-crystalline semiconductor. Furthermore, formation of thin layer on surface of the inhomogeneous semiconductor, which is related to power conversion efficiency as well as dye content, has been studied. |
