RESUMEN
In this paper, a series of mesoporous anatase TiO2 crystals were prepared through a hydrothermal method. By using different carboxylic acids as solvents and additives, the morphology of the integral crystals as well as inner pores can be tuned by the chain length of the carboxylic acids. Further application of these anatase TiO2 crystals as the photoanode of DSCs resulted in an overall energy conversion efficiency of 7.55% because of their low electrical resistivity loss and improved light harvesting abilities.
RESUMEN
A low-cost hydrothermal method was used to synthesize high-purity bipyramidal single-crystals of TiO2 enclosed with high percentage of (101) facets. The oriented attachment behavior can be controlled by fine tuning the reaction temperature. This played an important role in determining the crystal growth along [001] direction resulting in the self-assembly of the bipyramid crystals into connected ones to form single-crystal nanrods without the loss of surface area. In addition, the relationship between oriented attachment and the photovoltaic performance of such anatase TiO2 nanocrystals in photoanodes of DSCs was investigated. The highly oriented sample reached a maximum overall energy conversion efficiency of 8.63 %. These results further illustrated that the highly oriented samples have superior charge transport ability derived from the enhanced long-range atomic arrangement with reduced grain boundaries and comparable uptake of dye molecules.
RESUMEN
A novel multifunctional inverse opal-like TiO2 electron transport layer (IOT-ETL) is designed to replace the traditional compact layer and mesoporous scaffold layer in perovskite solar cells (PSCs). Improved light harvesting efficiency and charge transporting performance in IOT-ETL based PSCs yield high power conversion efficiency of 13.11%.