Doping of TiO₂for sensitized solar cells

Abstract

This review gives a detailed summary and evaluation of the use of TiO2 doping to improve the performance of dye sensitized solar cells. Doping has a major effect on the band structure and trap states of TiO2, which in turn affect important properties such as the conduction band energy, charge transport, recombination and collection. The defect states of TiO2 are highly dependent on the synthesis method and thus the effect of doping may vary for different synthesis techniques, making it difficult to compare the suitability of different dopants. High-throughput methods may be employed to achieve a rough prediction on the suitability of dopants for a specific synthesis method. It was however found that nearly every employed dopant can be used to increase device performance, indicating that the improvement is not so much caused by the dopant itself, as by the defects it eliminates from TiO2. Furthermore, with the field shifting from dye sensitized solar cells to perovskite solar cells, the role doping can play to further advance this emerging field is also discussed.

A Ga-doped SnO2 mesoporous contact for UV stable highly efficient perovskite solar cells

“…The degradation of PSCs has been ascribed to several different mechanisms related to the metal oxide component, the main ones being UV-light induced desorption of O 2 from the metal oxide surface 17,18 and the photocatalytic properties of TiO 2 actively degrading the perovskite light absorber. 19,34 Aer storing the devices in the dark for 200 hours, the PCE does not recover. As O 2 desorption is reversible, this process can be excluded, leaving the photocatalytic degradation catalyzed by the metal oxide as the most likely degradation pathway.…”

“…Doping metal oxides can have large effects on the morphology of the electrode 34 and doping can thus affect the metal oxide-perovskite interface area and penetration of the perovskite into the mesoporous metal oxide network. To minimise the inuence of morphology on device performance, the self-assembly of the amphiphilic block-copolymer polyisopreneblock-polyethylene oxide (PI-b-PEO) was used to direct the mSnO 2 morphology.…”

Pure and Fe-Doped Mesoporous Titania Catalyse the Oxidation of Acid Orange 7 by H2O2 under Different Illumination Conditions: Fe Doping Improves Photocatalytic Activity under Simulated Solar Light

“…Such physico-chemical properties promote the use of TiO 2 mostly as photocatalyst and/or a catalytic support [3][4][5][6][7], although it is also used in dye sensitized solar cells [8][9][10][11] and, recently, in biomedical applications [12,13]. Moreover, the possibility of obtaining ordered porous structures with remarkable specific surface area (SSA) enhances the use of TiO 2 in…”

On the Origin of Enhanced Photocatalytic Activity of Copper-Modified Titania in the Oxidative Reaction Systems

“…The applicative potential of TiO 2 -photocatalysis is presently focused on the areas such as environmental remediation (water treatment [2][3][4] and air purification [5]), renewable energy processes-water splitting for hydrogen production [6], conversion of CO 2 to hydrocarbons [7], solar cells [8]-and self-cleaning surfaces [9]. TiO 2 is characterized by those properties that are indispensable to fulfill the requirements of efficient, stable, and green photocatalytic material (long term stability, chemical inertness, corrosion resistance, non-toxicity) [1].…”