| 초록 |
We synthesized solid state-hole transporting materials (bis-EDOTs) with different ethylene glycol side chain (EGO) lengths (TBO3, TBO4, and TBO5) and investigated their polymerization characteristics during in Situ photoelectrochemical polymerization (PEP) at the surfaces of dye (D205)-sensitized TiO2 nanocrystalline particles. During the PEP reaction, the thiophene-based monomers were expected to diffuse toward neighboring dyes through the growing polymer layers to enable continuous chain growth. We found that the less steric hinderance monomer (TBO3) formed a more compact polymer layer with a high degree of polymerization. Its diffusion to the active sites through the resulting growing polymer layer was, therefore, limited. We deployed layers of the polymers (PTBO3, PTBO4, and PTBO5) in iodine-free solid-state hybrid solar cells to confirm reduction of the lithium effect decreasing the efficiency of DSSCs and we have realized PTBO4 and PTBO5 were capable of chelating lithium ions, yielding a photovoltaic performance that was 142% of the performance obtained without the polymer layers (3.0 → 5.2%). |
