Surface Modification of Mesoporous TiO2 Films by a Self-Assembly Monolayer for Dye-Sensitized Solar Cell Applications

摘要: Mesoporous TiO2 films were surface-modified by a self-assembly monolayer (SAM), 3-Aminopropyl-methyl-diethoxysilane (APMDS). The APMDS-modified used to fabricate dye-sensitized solar cells (DSSCs) adsorption of dye N719. APMDS-SAM is anticipated be an intermediate layer incorporate sensitizers, regulating the charge transfer at TiO2/electrolyte interface. effect on performance DSSCs was studied in terms preparation conditions SAMs. results show that presence SAM slightly decreases short circuit current (Isc), ascribed decrease dye-adsorption sites after formation SAM. However, open-circuit potential (Voc) DSSC can increase significantly due APMDS SAM, which contributes overall efficiency from 6.133% 6.922%. analysis electrochemical impedance spectroscopy (EIS) indicates triggers higher resistance TiO2-photoelectrode/electrolyte interface, means inhibit recombination It also found SAM-modified photoelectrode intimately related reaction time A too long may lead aggregation mesopores, resulting cell performance.