Impact of the titania nanostructure on charge transport and its application in hybrid solar cells

KOFFMAN-FRISCHKNECHT, ALEJANDRO; GONZALEZ, FERNANDO; PLÁ, JUAN; VIOLI, IANINA; SOLER-ILLIA, GALO J. A. A.; PEREZ, M. DOLORES

Applied Nanoscience

CROSSMARK

Año: 2018

2190-5509

Porous titania flms are widely studied in a number of optoelectronic applications due to its favorable optical and electroniccharacteristics. Mesoporous titania thin flms (MTTFs) with tunable pore size, pore order, accessibility and crystallinityare of interest in electronic devices due to the potential for optimization of the desired characteristics for charge separationand carrier transport. In this work, several MTTFs were prepared by sol?gel chemistry with diferent structural propertiestuned by post-synthesis thermal treatment. The efect of the structural properties (pore diameter, order and accessibility)on the electrical properties of the material was studied by flms fabrication onto a transparent conducting electrode, ITO,such that it enables optoelectronic applications. The performance as photoanode was explored by the fabrication of hybridpolymer (P3HT): titania solar cells. Not only does structural properties afect polymer impregnation inside the titania poresas expected and hence impacts charge separation at the interface, but also the thermal treatment afects crystallinity and theflms electronic properties. A more complete picture about the electronic properties of the diferent MTTFs prepared in thiswork was studied by mobility measurement by space charge limited current and impedance spectroscopy.